{"product_id":"2-1ch-bluetooth-amplifier-board-200w-class-d-50w-2-100w-subwoofer-bass-treble-usb-app-mic-ktv-dc12-24v-hifi-diy-speaker","title":"2.1CH Bluetooth Amplifier Board 200W Class D 50W*2+100W Subwoofer Bass Treble USB APP MIC KTV DC12-24V HiFi DIY Speaker","description":"\u003ch1\u003eSPECIFICATIONS\u003c\/h1\u003e\u003cp\u003e\u003cspan\u003eAdjustment Method\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e5 Independent Knobs \/ Mobile APP Control(Only YS-TB21H)\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eApplication\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eDIY Speaker,Home Theater,Car Audio,Shop Background Music,Home KTV(YS-TB21H)\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eAudio Input Mode\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eBluetooth 5.1,AUX,USB(Only YS-TB21H)\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eBluetooth Version\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eBluetooth 5.1\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eBrand Name\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eNONE\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eChannel\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e2.1 Channel\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eExpansion Function\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMIC Reverb Expansion Port (Only YS-TB21H)\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eFeature 1\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e2.1 amplifier for speakers\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eFeature 2\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eamplifier subwoofer\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eFeature 3\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003esound amplifier\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eFeature 4\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eFully Shielded Inductor Anti-interference\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eFeature 5\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003estereo amplifier module\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eHeat Dissipation\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eIntegrated Aluminum Heat Sink (YS-TB21H Enhanced Heat Sink)\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eHigh-concerned chemical\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003enone\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eInput Voltage\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eDC 12V-24V\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eMaterial\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003ePlastic\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eModel Number\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eYS-TB21H\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOrigin\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMainland China\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOutput Power\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e50W*2+100W Total 200W\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003ePackage Weight\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e0.18kg\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eSubwoofer Frequency Range\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e20Hz-200Hz Adjustable\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eSupported Speaker Impedance\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e4 Ohm - 8 Ohm\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eType\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eOther\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eUse\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eHome DIY\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eis_customized\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eNo\u003c\/span\u003e\u003c\/p\u003e\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003ckse:widget data-widget-type=\"customText\" id=\"1005000030341602\" type=\"relation\"\u003e\u003c\/kse:widget\u003e\u003c\/div\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch1 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003cstrong\u003eYS-TB21H 2.1CH Bluetooth Amplifier Board 200W Class D 50W*2+100W Subwoofer Bass Treble USB APP MIC KTV DC12-24V HiFi DIY Speaker\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eProduct Description (Professional English Version for AliExpress Detail Page)\u003c\/h1\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch2 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003eSienwiny YS-TB21H 2.1 Channel Bluetooth Digital Power Amplifier Board\u003c\/h2\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003eNew 2026 Upgraded Generation | Two Versions Optional for DIY Hi-Fi Audio\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch3 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e1. Product Overview\u003c\/h3\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003cdiv\u003eSienwiny YS-TB21H are newly-launched 2.1-channel Class D digital amplifier boards, designed for DIY speaker modification, home theater, car audio and background music systems. Both models adopt fully upgraded circuit architecture, large-capacity low-ESR energy storage capacitors and full-shield inductors, delivering low-noise Hi-Fi transparent sound.\u003c\/div\u003e\n\u003cdiv\u003eThe total peak power reaches 200W (50W×2 stereo full-range channels + 100W independent subwoofer channel). Equipped with 5 independent precision encoder knobs to separately adjust master volume, treble, mid-bass, subwoofer volume and subwoofer cutoff frequency. Wide DC 12–24V working voltage fits most power supply solutions.\u003c\/div\u003e\n\u003cdiv\u003eWe provide two versions to match different user demands: Standard YS-TB21 for basic wireless audio demand; Upgraded YS-TB21H with exclusive USB playback, mobile APP intelligent control and dual microphone reverb expansion port for multi-scene use like home KTV.\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch3 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e2. Core Unified Specifications  \u003c\/h3\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px 0px 8px;margin-bottom:8px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:flex' align=\"start\"\u003e\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003ctable style=\"border-collapse:collapse;width:655.52pt\" width=\"874\" height=\"349\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\"\u003e\n\u003ccolgroup\u003e\n\u003ccol width=\"233\"\u003e\n\u003ccol width=\"641\"\u003e\n\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr height=\"22\" style=\"height:22\"\u003e\n\u003ctd style=\"width:174.75pt;height:17pt\" class=\"et3\" width=\"233\" height=\"22\"\u003e\u003cp\u003eItem\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et3\" width=\"641\"\u003e\u003cp\u003eParameter\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"22\" style=\"height:22\"\u003e\n\u003ctd style=\"width:174.75pt;height:17pt\" class=\"et4\" width=\"233\" height=\"22\"\u003e\u003cp\u003eBrand\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et4\" width=\"641\"\u003e\u003cp\u003eSienwiny\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"22\" style=\"height:22\"\u003e\n\u003ctd style=\"width:174.75pt;height:17pt\" class=\"et4\" width=\"233\" height=\"22\"\u003e\u003cp\u003eModel\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et4\" width=\"641\"\u003e\u003cp\u003eYS-TB21H\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"22\" style=\"height:22\"\u003e\n\u003ctd style=\"width:174.75pt;height:17pt\" class=\"et4\" width=\"233\" height=\"22\"\u003e\u003cp\u003eChannel Mode\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et4\" width=\"641\"\u003e\u003cp\u003e2.1 Channel (2×Full Range Stereo + Independent Subwoofer Output)\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"22\" style=\"height:22\"\u003e\n\u003ctd style=\"width:174.75pt;height:17pt\" class=\"et4\" width=\"233\" height=\"22\"\u003e\u003cp\u003eOutput Power\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et4\" width=\"641\"\u003e\u003cp\u003eLeft\/Right Channel: 50W×2; Subwoofer Channel: 100W; Total 200W\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"22\" style=\"height:22\"\u003e\n\u003ctd style=\"width:174.75pt;height:17pt\" class=\"et4\" width=\"233\" height=\"22\"\u003e\u003cp\u003eWorking Voltage\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et4\" width=\"641\"\u003e\u003cp\u003eDC 12V – 24V Wide Voltage Input\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"22\" style=\"height:22\"\u003e\n\u003ctd style=\"width:174.75pt;height:17pt\" class=\"et4\" width=\"233\" height=\"22\"\u003e\u003cp\u003eAdjustment Knobs\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et4\" width=\"641\"\u003e\u003cp\u003e5 Independent Precision Encoders: Master Volume \/ L\/R Bass \/ L\/R Treble \/ Subwoofer Volume \/ Subwoofer Frequency (20–200Hz Adjustable)\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"22\" style=\"height:22\"\u003e\n\u003ctd style=\"width:174.75pt;height:17pt\" class=\"et4\" width=\"233\" height=\"22\"\u003e\u003cp\u003eCore Audio Tech\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et4\" width=\"641\"\u003e\u003cp\u003eHi-Fi Low Distortion Circuit, Fully Shielded Power Inductor, Large Low-ESR Filter Capacitor\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"22\" style=\"height:22\"\u003e\n\u003ctd style=\"width:174.75pt;height:17pt\" class=\"et4\" width=\"233\" height=\"22\"\u003e\u003cp\u003eProtection Circuit\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et4\" width=\"641\"\u003e\u003cp\u003eMulti-layer Safety Protection: Overvoltage \/ Undervoltage \/ Overheat \/ Short Circuit \/ DC Offset Protection\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"22\" style=\"height:22\"\u003e\n\u003ctd style=\"width:174.75pt;height:17pt\" class=\"et4\" width=\"233\" height=\"22\"\u003e\u003cp\u003eSupported Speaker Impedance\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et4\" width=\"641\"\u003e\u003cp\u003e4Ω–8Ω Speakers (Full Range \u0026amp; Passive Subwoofer)\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"22\" style=\"height:22\"\u003e\n\u003ctd style=\"width:174.75pt;height:17pt\" class=\"et4\" width=\"233\" height=\"22\"\u003e\u003cp\u003ePatent \u0026amp; Copyright\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et4\" width=\"641\"\u003e\u003cp\u003ePatent Certified, Official Copyright Reserved, Forbidden Infringement\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr height=\"100\" style=\"height:100\"\u003e\n\u003ctd style=\"width:174.75pt;height:75pt\" class=\"et4\" width=\"233\" height=\"100\"\u003e\u003cp\u003eCompatible Scenarios\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:480.75pt\" class=\"et4\" width=\"641\"\u003e\u003cp\u003eDIY Desktop Hi-Fi Speakers, Home Theater System, Car Subwoofer Refit, Shop Background Music, Mini KTV Audio Modification\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv\u003e\u003cspan style=\"background-color:rgba(0, 0, 0, 0)\"\u003e3. \u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch4 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003eYS-TB21 (Standard Basic Version)\u003c\/h4\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch4 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003eYS-TB21H (New Upgraded Premium Version)\u003c\/h4\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003col style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eAudio Input Mode: Bluetooth 5.1 + AUX Wired + USB Disk Local Music Playback (3 Input Modes, exclusive upgrade)\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\n\u003cdiv\u003eIntelligent APP Control: Dedicated mobile wireless control APP, support:\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"left\"\u003e\u003cul style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"left\"\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eRemote power on\/off\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eOne-click audio source switching\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eVisual real-time EQ fine-tuning\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eWireless parameter adjustment without twisting knobs\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eKTV Expansion Port: Dual independent microphone preamp reverb input \u0026amp; output ports, support external microphone reverb board for home karaoke\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eHeat Dissipation: Enlarged thickened integrated heat sink, stronger heat resistance, stable temperature under long-time high-power operation\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eStandard Accessories: 1×Adjustment Screwdriver + 1×DC Power Terminal Adapter\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch3 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e4. Advanced Hardware Upgrade Highlights (All New Generation)\u003c\/h3\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003col style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\n\u003cdiv\u003eSleek Compact PCB Layout\u003c\/div\u003e\n\u003cdiv\u003eMiniaturized integrated layout, compared with old bulky chaotic amplifiers, easier to install inside speaker cabinet, save modification space.\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\n\u003cdiv\u003eLarge-Capacity Low-ESR Energy Storage Capacitor\u003c\/div\u003e\n\u003cdiv\u003eStable power output, effectively reduce heat accumulation during continuous playback, improve dynamic sound performance.\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\n\u003cdiv\u003eFull-Shield Enclosed Power Inductor\u003c\/div\u003e\n\u003cdiv\u003eGreatly lower background noise floor, anti-electromagnetic interference, no buzzing noise when playing music.\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\n\u003cdiv\u003eReinforced Integrated Heat Sink (YS-TB21H Enhanced)\u003c\/div\u003e\n\u003cdiv\u003eQuick heat conduction for power chips, avoid automatic overheat protection under long high-load work.\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\n\u003cdiv\u003eIndependent Full-Range EQ Tuning System\u003c\/div\u003e\n\u003cdiv\u003eSeparate control for treble, bass and subwoofer frequency, customize sound field as you like: clear vocals, thick and powerful low frequency, transparent high frequency details.\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch3 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e5. Multi Input Source Function Introduction\u003c\/h3\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch4 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003eExclusive Input for YS-TB21H (Extra USB Function)\u003c\/h4\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003eBesides Bluetooth \u0026amp; AUX, it adds USB audio input, directly insert U disk to decode and play local audio files, no extra mobile device required, independent music playback solution.\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch3 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e6. Interface Definition Guide\u003c\/h3\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch4 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003eCommon Interfaces for Both Models\u003c\/h4\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003col style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eDC 12–24V Power Input: External DC power supply terminal\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eAUX Audio Input: 3.5mm analog wired audio signal input\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eLeft Channel Output: Connect left full-range speaker\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eRight Channel Output: Connect right full-range speaker\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eSubwoofer Output: Connect passive subwoofer speaker\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eMaster Volume Knob: Control overall system volume \u0026amp; power switch\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eL\/R Bass Knob: Adjust stereo mid-bass gain\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eL\/R Treble Knob: Adjust stereo high frequency brightness\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eSubwoofer Volume Knob: Control independent subwoofer output loudness\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eSubwoofer Frequency Knob: Adjust low-pass cutoff frequency 20–200Hz\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch4 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003eExclusive Interfaces Only for YS-TB21H\u003c\/h4\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003col style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eUSB Audio Input: U disk music playback port\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eMIC Reverb Input Port: Access microphone signal for karaoke\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eMIC Reverb Output Port: Expand external reverberation audio module\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch3 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e7. Package Contents\u003c\/h3\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003cdiv\u003e1 × Sienwiny YS-TB21H 2.1CH Amplifier Board\u003c\/div\u003e\n\u003cdiv\u003e1 × Adjustment Screwdriver\u003c\/div\u003e\n\u003cdiv\u003e1 × DC Power Terminal Conversion Connector\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch3 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e8. Warm Tips\u003c\/h3\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003col style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003ePlease use DC 12V–24V power supply matching the power demand; higher voltage will damage the board.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eThe amplifier only supports passive speakers (4–8Ω), active speakers are not applicable.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eThe subwoofer output is for passive subwoofer only, cannot drive full-range speakers alone.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eAPP wireless control function is only available on YS-TB21H version; \u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eUSB playback and microphone KTV expansion functions are exclusive upgrades of YS-TB21H.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eDo not short-circuit speaker output terminals during operation to trigger protection circuit.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\u003c\/div\u003e\n\u003chr style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);border-bottom:0px solid rgb(0, 0, 0);border-left:0px solid rgb(0, 0, 0);border-right:0px solid rgb(0, 0, 0);border-top:1.11111px solid rgb(0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\u003ch2 style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003eUsage Tips for Listing\u003c\/h2\u003e\u003c\/div\u003e\n\u003cdiv style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003col style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:start;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:block' align=\"start\"\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eThis full text is professional industrial audio terminology, fits DIY audio buyers, wholesale purchasers and home audio enthusiasts on AliExpress;\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eAll parameters strictly follow the product pictures \u0026amp; information you provided, no exaggerated power or function claims to avoid platform violation disputes;\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eStructure layered clearly: Overview → Unified Spec Table → Version Comparison → Hardware Advantages → Interface Intro → Package List → Warm Tips, buyer can quickly locate information;\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003eShort segmented paragraphs, suitable for mobile phone detail page reading; key upgrade points of YS-TB21H are marked repeatedly to guide customers to choose high-margin upgraded version.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style='font-family:ui-sans-serif, system-ui, sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";font-size:16px;font-weight:400;line-height:24px;text-align:left;white-space:normal;color:rgb(0, 0, 0);background-color:rgba(0, 0, 0, 0);margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;display:list-item' align=\"left\"\u003e\u003cp\u003e\u003cstrong\u003eYS-TB21H Product Introduction Image\u003c\/strong\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sa2f2cbcd7e5e4d05bda983ed9b9862c6q.png\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S73d6c6fd755e44f18878ecbe60dad8eeE.png\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Se1e8a76114eb4c22a7d92bdcf4daeb4eD.png\" slate-data-type=\"image\"\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S9fa669754fcc4fe7ab3ec9aad038c49fM.jpg?width=1254\u0026amp;height=1254\u0026amp;hash=2508\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S464bc2ec3e274b46909316ae0433e35dW.jpg?width=1254\u0026amp;height=1254\u0026amp;hash=2508\" slate-data-type=\"image\"\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S6db893bb03f3418980296d457ff9349cw.jpg?width=1254\u0026amp;height=1254\u0026amp;hash=2508\" slate-data-type=\"image\"\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S672a3780f64c4cd6aadb70164657d6be9.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Se17e89c97b7f4013a1e7f299facd47696.png\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sfa895da5e4194358a4ecde7d244918d5B.png\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Yoeruyo","offers":[{"title":"YS-TB21H","offer_id":55506291196203,"sku":"14:350686#YS-TB21H","price":87.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1000\/5744\/8747\/files\/Se17e89c97b7f4013a1e7f299facd47696.webp?v=1788929663","url":"https:\/\/yoeruyo.com\/products\/2-1ch-bluetooth-amplifier-board-200w-class-d-50w-2-100w-subwoofer-bass-treble-usb-app-mic-ktv-dc12-24v-hifi-diy-speaker","provider":"Yoeruyo","version":"1.0","type":"link"}