{"product_id":"aiyima-a20-mono-pffb-tpa3255-power-amplifier-300w-class-d-mono-amp-xlr-rca-trs-input-sub-out-hpf-home-audio-12v-trigger-vu-meter","title":"AIYIMA A20 MONO PFFB TPA3255 Power Amplifier 300W Class D MONO Amp XLR RCA TRS Input Sub Out HPF Home Audio 12V Trigger VU Meter","description":"\u003ch1\u003eSPECIFICATIONS\u003c\/h1\u003e\u003cp\u003e\u003cspan\u003eAIYIMA Model\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eA20 MONO\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eBrand Name\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eAiyima\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eCertification\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eCE,KC,RoHS\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eChannels\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e1\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eControl Method\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003ePush button\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\u003eMaterial\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMetal\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eMaximum Power Per Channel\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eAbove 200W\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eModel Number\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eAIYIMA A20 MONO\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eNumber of channels\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e1\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\"\u003e300W\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003ePackage\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eYes\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eSurround sound channel configuration\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eOthers\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003ckse:widget data-widget-type=\"customText\" id=\"1005000024834402\" type=\"custom\"\u003e\u003c\/kse:widget\u003e\u003ckse:widget data-widget-type=\"customText\" id=\"1005000024646802\" type=\"custom\"\u003e\u003c\/kse:widget\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S2c72910deec1417cacf3d316d7b91ee0W.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style='color:rgb(34, 34, 34);font-size:20px;font-family:\"TT Norms Pro\", \"Open Sans\", Roboto, Arial, Helvetica, sans-serif, SimSun'\u003e\u003cstrong\u003e\u003cspan class=\"EzKURWReUAB5oZgtQNkl\" style=\"font-size:20px\"\u003eFeatures:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003e1. Advanced PFFB Technology for Consistent Sound Quality:\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eEquipped with the latest PFFB (Post Filter Feedback) design, the A20 MONO significantly reduces load-dependent distortion and frequency response variations, delivering accurate and stable sound performance with different speaker loads.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003e2. Powerful TPA3255 Mono Amplifier:\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eFeaturing the renowned TPA3255 Class D amplifier chip, the A20 MONO delivers up to 620W @ 2Ω, 300W @ 4Ω, and 170W @ 8Ω, providing ample power for bookshelf, floor-standing, and high-performance speakers.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003e3. Audiophile-Grade Components:\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eBuilt with premium OPA1612, replaceable LME49720 op-amp, WIMA capacitors, and Rubycon 63V 3300μF capacitors, ensuring exceptional clarity, dynamics, and musical detail.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003e4. Balanced \u0026amp; Versatile Connectivity:\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eSupports XLR, RCA, and TRS inputs, making it easy to connect DACs, preamps, mixers, PCs, CD players, and professional audio equipment for both home and studio applications\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003eNOTE\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"color:rgb(244, 78, 59);font-size:20px\"\u003eThe VU meter features auto-gain adjustment to adapt to varying volumes; readings are for reference only. If an offset occurs, turn the frame screw for zero-point calibration.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003cspan style='color:rgb(34, 34, 34);font-size:14px;font-family:\"TT Norms Pro\", \"Open Sans\", Roboto, Arial, Helvetica, sans-serif, SimSun'\u003e\u003cstrong\u003e\u003cspan style='color:rgb(34, 34, 34);font-size:22px;font-family:\"TT Norms Pro\", \"Open Sans\", Roboto, Arial, Helvetica, sans-serif, SimSun'\u003eProduct Specification:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eAmplifier Chip: TPA3255\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eOP AMP Chip: OPA1612 (Non-Replaceable) + LME49720 (1 Replaceable)\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eKey Components: WIMA Capacitors + Rubycon 63V 3300μF Capacitors\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eMaximum Output Power:\u003cbr\u003e300W @ 4Ω THD+N \u0026lt; 10%\u003cbr\u003e170W @ 8Ω THD+N \u0026lt; 10%\u003cbr\u003e620W @ 2Ω THD+N \u0026lt; 10%\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eRated Output Power:\u003cbr\u003e200W @ 4Ω THD+N \u0026lt; 1%\u003cbr\u003e100W @ 8Ω THD+N \u0026lt; 1%\u003cbr\u003e400W @ 2Ω THD+N \u0026lt; 1%\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eSNR: ≥118dB\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eTHD+N: 0.002%\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eFrequency Response: 20Hz-20kHz (+0.4dB)\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eInput Interfaces: RCA, XLR, TRS\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eOutput Interfaces: Passive Speaker Output + Active Subwoofer Output\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eSupported Devices: DAC, Preamplifier, PC, CD Player and More\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eSUB Output Level: 2V\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eSUB Output Frequency: 20Hz-200Hz (Can Follow HPF Cutoff to 80Hz)\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eHigh-Pass Filter Frequency: 80Hz\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eHigh-Pass Filter Slope: 12dB\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eRCA Gain: 19dB \/ 25dB\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eXLR Gain: 20dB\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eSpeaker Impedance: 2-8Ω\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003ePower Supply: DC 32-48V\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eProduct size: 80 × 140 × 90mm\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003ePackage size: 207 × 198 × 124mm\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003eNet Weight: 950g\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003ePackage Weight: 1490g\u003cbr\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan style='color:rgb(34, 34, 34);font-size:14px;font-family:\"TT Norms Pro\", \"Open Sans\", Roboto, Arial, Helvetica, sans-serif, SimSun'\u003e\u003cstrong\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:22px\"\u003ePackage Include:\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cul style='font-family:\"TT Norms Pro\", \"Open Sans\", Roboto, Arial, Helvetica, sans-serif, SimSun;font-size:14px;font-weight:400;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(34, 34, 34);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;list-style:disc;box-sizing:border-box' align=\"start\"\u003e\n\u003cli style=\"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;box-sizing:border-box\"\u003e\u003cp style=\"line-height:inherit;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;box-sizing:border-box\"\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eA20 mono Amplifier x1\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style=\"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;box-sizing:border-box\"\u003e\n\u003cp style=\"line-height:inherit;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;box-sizing:border-box\"\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eUser Manual x1\u003c\/span\u003e\u003c\/p\u003e\n\u003cul style='font-family:\"TT Norms Pro\", \"Open Sans\", Roboto, Arial, Helvetica, sans-serif, SimSun;font-size:14px;font-weight:400;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(34, 34, 34);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;list-style:disc;box-sizing:border-box' align=\"start\"\u003e\u003cli style=\"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;box-sizing:border-box\"\u003e\u003cdiv style=\"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;box-sizing:content-box\" class=\"detailmodule_html\"\u003e\u003cdiv style=\"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;box-sizing:content-box\" class=\"detail-desc-decorate-richtext\"\u003e\u003cdiv style=\"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;box-sizing:content-box\" class=\"detailmodule_html\"\u003e\u003cdiv style=\"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;box-sizing:content-box\" class=\"detail-desc-decorate-richtext\"\u003e\u003cdiv style=\"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;box-sizing:content-box\"\u003e\u003cdiv style=\"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;box-sizing:content-box\"\u003e\u003cdiv style=\"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;box-sizing:content-box\"\u003e\u003cdiv style=\"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;box-sizing:content-box\"\u003e\u003cdiv style=\"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;box-sizing:content-box\"\u003e\u003cdiv style=\"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;box-sizing:content-box\"\u003e\u003cdiv style=\"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;box-sizing:content-box\"\u003e\n\u003cul style='font-family:\"TT Norms Pro\", \"Open Sans\", Roboto, Arial, Helvetica, sans-serif, SimSun;font-size:14px;font-weight:400;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(34, 34, 34);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;list-style:disc;box-sizing:border-box' align=\"start\"\u003e\n\u003cli style=\"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;box-sizing:border-box\"\u003e\u003cp style=\"line-height:inherit;margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px\"\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eWarranty Card x1\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli style=\"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;box-sizing:border-box\"\u003e\u003cp style=\"line-height:inherit;margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px\"\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003e48V 5A Power supply(option)\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style='font-size:22px;font-family:\"times new roman\", times, serif'\u003eFAQ \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"line-height:inherit;margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px\"\u003e\u003cspan style=\"font-size:18px\"\u003eQ: Do I need two A20 MONO amplifiers for stereo sound?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: Yes. One A20 MONO drives one speaker channel. For stereo playback, two units are required—one for the left speaker and one for the right speaker.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: Will the A20 MONO sound harsh like typical Class D amplifiers?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: No. With advanced PFFB technology, the A20 MONO delivers a smoother, more natural sound while maintaining the clarity and efficiency of a Class D amplifier.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: Which gain setting should I choose, 19dB or 25dB?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003e19dB: Best for high-output sources such as balanced XLR DACs or preamps.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003e25dB: Best for lower-output sources such as RCA devices, providing higher sensitivity and output level.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: Does the amplifier get hot? Is it safe for long-term use?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: The A20 MONO uses a highly efficient Class D design with an aluminum alloy chassis for heat dissipation. It remains warm during operation and is suitable for extended listening sessions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: What cable is required for the 12V Trigger input?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: Use a standard 3.5mm trigger cable. The 12V Trigger input allows synchronized power on\/off with compatible audio equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: How does the 20-minute auto standby function work?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: If no audio signal is detected for 20 minutes, the amplifier automatically enters standby mode. Playback will automatically resume when an audio signal is detected.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: Does the VU meter stay illuminated in standby mode?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: YES. \u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: Will there be a \"pop\" sound from the speakers when powering on or off?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: No. The A20 MONO features a built-in soft-start protection circuit to prevent power-on and power-off noise, helping protect your speakers and drivers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: The VU meter needle barely moves. Is it defective?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: No. The VU meter responds to output power. At low volume levels or with less dynamic music, needle movement may be minimal. Increasing the volume or playing more dynamic content will result in more noticeable movement.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: How should I match the input sensitivity with my preamp?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: The input sensitivity is 2.0V for RCA and 4.0V for XLR, matching most DACs and preamplifiers. For high-output sources, use the 19dB gain setting to avoid input overload.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: Why do my bookshelf speakers sound thinner when HPF is enabled?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: This is normal. Enabling HPF filters out frequencies below 80Hz. For full-range sound, connect an active subwoofer to the SUB OUT output.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: Can I build a 5.1 or 7.1 system with A20 MONO amplifiers?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: Yes. Multiple A20 MONO amplifiers can be used to build multi-channel systems, providing dedicated power for each speaker channel.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eQ: Why does the SUB OUT frequency change when HPF is enabled?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:18px\"\u003eA: When HPF is enabled, the SUB OUT crossover frequency automatically follows the 80Hz HPF setting to ensure smooth integration between the speakers and subwoofer. This helps achieve a more balanced 2.1 audio system.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sec08d10443594ff9b3bc7b79f7e50ad9l.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sd2a5f6cf078b4ea5837e242103be3aaft.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sd6373974f1204afb861595698601f0e3W.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S1e5eb6387d9a41cbb949c51797ce07d8C.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S620d624139f840059d56cbc1325a71c4E.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sa6704f53764b47ceb61b688c4583ed23S.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S9296a655ba23474eb8776ced8eda3946R.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S975f8aaad3944407bccf1da9732d9c65c.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S5cb011c846054f7ab93cf7d77ac0016ae.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S8949ef1da9d047eaa9fb2287ef86efbd1.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sac657efa252a48b39fd8f45253879f242.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sb2592d025d7541f3bca9cc278b6eca1dM.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S45612abf837d4abdaa7b137939dd8d9dU.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sec62b259699c453b954671fb55513e86s.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S2e4ed08f4c494c9694f23247b358f701J.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Saec728e6641c490091e9a74b50c06996i.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S35cbeae8bf9d45fd9f30fdd55a6bc1feO.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S7e06094731244350afa40d3a1e7c773aN.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Se128875fd7a1400dbeea9a96d057680cv.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003ckse:widget data-widget-type=\"customText\" id=\"1005000015730001\" type=\"custom\"\u003e\u003c\/kse:widget\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Yoeruyo","offers":[{"title":"A20 MONO with 48V AU \/ China Mainland","offer_id":55374278361387,"sku":"14:193#A20 MONO with 48V AU;200007763:201336100","price":678.11,"currency_code":"USD","in_stock":true},{"title":"A20 MONO with 48V KR \/ China Mainland","offer_id":55374278394155,"sku":"14:350853#A20 MONO with 48V KR;200007763:201336100","price":678.11,"currency_code":"USD","in_stock":true},{"title":"A20 MONO with 48V US \/ China Mainland","offer_id":55374278426923,"sku":"14:865#A20 MONO with 48V US;200007763:201336100","price":678.11,"currency_code":"USD","in_stock":true},{"title":"only A20 MONO \/ China Mainland","offer_id":55374278459691,"sku":"14:618#only A20 MONO;200007763:201336100","price":585.05,"currency_code":"USD","in_stock":true},{"title":"A20 MONO with 48V EU \/ China Mainland","offer_id":55374278492459,"sku":"14:1254#A20 MONO with 48V EU;200007763:201336100","price":678.11,"currency_code":"USD","in_stock":true},{"title":"A20 MONO with 48V UK \/ China Mainland","offer_id":55374278525227,"sku":"14:1202#A20 MONO with 48V UK;200007763:201336100","price":678.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1000\/5744\/8747\/files\/S10baad2b77124e6eb18e8d594611c2e1G.webp?v=1788325260","url":"https:\/\/yoeruyo.com\/products\/aiyima-a20-mono-pffb-tpa3255-power-amplifier-300w-class-d-mono-amp-xlr-rca-trs-input-sub-out-hpf-home-audio-12v-trigger-vu-meter","provider":"Yoeruyo","version":"1.0","type":"link"}