{"product_id":"aiyima-audio-a3001-tpa3255-subwoofer-amplifier-300w-hifi-speaker-amplifier-mono-sound-power-amplificador-class-d-home-audio-amp","title":"AIYIMA Audio A3001 TPA3255 Subwoofer Amplifier 300W HIFI Speaker Amplifier Mono Sound Power Amplificador Class D Home Audio Amp","description":"\u003ch1\u003eSPECIFICATIONS\u003c\/h1\u003e\u003cp\u003e\u003cspan\u003eAIYIMA Model\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003ea3001\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\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\u003eFeature\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eSubwoofer \/ Full-Frequency\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\u003eMax output\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e300W\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eMaximum Power Per Channel\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e131-200W\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eModel Number\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eTPA3255 Amplifier\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\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cp\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\/HTB1j4yle.uF3KVjSZK9q6zVtXXak.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e\u003cspan style=\"background-color:rgb(0, 176, 240)\"\u003eProduct description:\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eProduct model: A3001\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eMaximum output power: \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"color:rgb(244, 78, 59)\"\u003e\u003cspan style=\"color:rgb(244, 78, 59);font-family:arial, helvetica, sans-serif\"\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(244, 78, 59);font-size:16px\"\u003e300W\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0)\"\u003e*1 \/ \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e4 Ohm load\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cp\u003e\u003cspan class=\"aNeGP0gI0B9AV8JaHPyH\"\u003eRated \u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eoutput \u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"aNeGP0gI0B9AV8JaHPyH\"\u003epower:250\u003c\/span\u003e\u003cspan style=\"color:rgb(244, 78, 59)\"\u003e\u003cspan style=\"color:rgb(244, 78, 59);font-family:arial, helvetica, sans-serif\"\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(244, 78, 59);font-size:16px\"\u003eW\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0)\"\u003e*1 \/ \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e4 Ohm load\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cspan style=\"color:rgb(255, 0, 0);font-size:16px;font-family:arial, helvetica, sans-serif\"\u003e\u003cspan style=\"font-size:16px;font-family:arial, helvetica, sans-serif\"\u003ePower amplifier chip:\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"color:rgb(255, 0, 0);font-size:16px;font-family:arial, helvetica, sans-serif\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:16px;font-family:arial, helvetica, sans-serif\"\u003eTPA3255\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px;font-family:arial, helvetica, sans-serif\"\u003eTone chip: NE5532\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px;font-family:arial, helvetica, sans-serif\"\u003eDC chip: 2596\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eFull frequency frequency response: 20Hz-20kHz (±3dB)\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eSpeaker matching impedance: 4-8Ω\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eDistortion: 0.03% when outputting 1W\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eWorking voltage: DC24-48V, 5A or more\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eSignal to noise ratio: ≥106dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eInput sensitivity: 0.775V\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eBass cutoff frequency adjustment range: 40-300Hz\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eBass attenuation slope: -12dB Slope\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eSUB mode： the bass cutoff frequency can be changed by adjusting the SUB FREQ knob.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eProduct size: 118*127*36mm\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003ePacking size: 255*215*65mm\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eProduct net weight: 520g\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003ePacking（without power supply）weight:700g\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0)\"\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eNote:The A3001's input sensitivity is 0.775V, but most preamps\/DACs output 2V. This causes the amp to reach its 300W max power at around half volume. Going higher triggers overload protection. So, do not turn the volume knob past halfway.\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\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\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0)\"\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eNote:\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"color:rgb(211, 49, 21)\"\u003eCommodity change, PBTL modified to FLAT\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0)\"\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"background-color:rgb(255, 255, 0)\"\u003eFLAT\/SUB Switch:\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0)\"\u003e\u003cspan style=\"font-size:16px\"\u003eWhen \"FLAT\/SUB\" is switched to \"SUB\", SPK OUT connects to the passive subwoofer.\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0)\"\u003e\u003cspan style=\"font-size:16px\"\u003eWhen \"FLAT\/SUB\" is switched to \"FLAT\", SPK OUT connects to the full range speaker.\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0)\"\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"background-color:rgb(255, 255, 0)\"\u003eThe SUBOUT is connected to active subwoofer.\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0)\"\u003e\u003cspan style=\"background-color:rgb(255, 255, 0)\"\u003eAt 32V 5A, speakers 4Ω 120W \/ 8Ω 80W\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0)\"\u003e\u003cspan style=\"background-color:rgb(255, 255, 0)\"\u003eIf the power of the speaker is too low, the power amplifier chip will be powered off for protection.\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e\u003cspan style=\"background-color:rgb(255, 255, 0)\"\u003eCommon problem:\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eQ: All my lines are connected, but there is no sound output?\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eAnswer: 1. Check if the POWER indicator is on. If it is not lit, press the POWER button to turn it on. After pressing the power button, the indicator light still does not light. At this time, you can find a laptop power supply to test to determine whether it is a machine fault or a power failure.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e2. If the indicator light is on, check if the VOL knob is in the minimum state, such as clockwise rotation in the minimum state.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e3. If both of the above are normal, check if the device that inputs the sound source is paused, muted, or the volume is at its minimum.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eQ: Why is the sound broken?\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eA: When the power amplifier exceeds the normal output power, there will be a large distortion. At this time, you can adjust the volume of the front stage or the volume of the power amplifier to be normal.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eQ: Why does the speaker have a large current sound?\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eA: If you are not using the original standard power supply, please replace the power supply before testing. A lot of power supply in the market has a large interference coefficient, which will cause a large current sound.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eQ: Why do I not play the sound source after I plug in the input cable, will the speaker have a lot of noise\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eA: When using a signal line without shielding, there will be interference signals entering the amplifier. If you hate this sound, you are advised to replace the shielded signal line or unplug the signal line.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eQ: Why doesn't my amp work after working for a while, and then work normally after disconnecting for a while\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eA: Usually this is the overheat protection of the amplifier. The output power may have exceeded the design power. At this point, you can lower the volume and try again.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eQ: Why is the volume of the machine unchanged, and the sound source is different when accessing different audio sources (such as connecting the CD first and then changing to the mobile phone)\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eA: The output signal amplitude of different types of audio equipment is different. The mobile phone is usually 0.35mV, while the CD is 1V. The output signal amplitude of the source directly affects the size of the sound.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eQ: Why is the power amplifier starting to listen to the sound is not very good, the high frequency is not clear, but the sound is normal after working for 8 hours?\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eA: Speakers and amplifiers are very sensitive devices. There will also be a familiar and matching process between each other. Usually, our new amplifiers and speakers will be down for more than 10 hours, and the sound will be very good.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0)\"\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003eNote:\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e1. Do not open the case privately. Improper handling may result in electric shock.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e2. Please use the switching power supply of the regular manufacturer, otherwise the risk of damage to the machine will be damaged.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e3. Do not place the machine in a high temperature and high humidity environment.\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e\u003cspan style=\"background-color:rgb(0, 176, 240)\"\u003ePackage included:\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e1Pcs A3001 Amplifier\u003c\/span\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e1Pcs Power Adpater 32V5A or 36V6A\u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cspan style=\"font-family:arial, helvetica, sans-serif\"\u003e(\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(255, 0, 0);font-size:16px;font-family:arial, helvetica, sans-serif\"\u003eOptional\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style=\"font-size:16px;font-family:arial, helvetica, sans-serif\"\u003e)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:16px;font-family:arial, helvetica, sans-serif\"\u003eWarranty：24 Months\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/HTB1bVqke79E3KVjSZFGq6A19XXal.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\u003cimg 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