{"product_id":"id3256805418717043","title":"Sound equipment Use amusement Fosi Audio V3 Stereo Power Amplifier 300W *2 TPA3255 Class D Mini Amp 2 Channel Audio Amplifier for Subwoofer Passive Bookshelf","description":"\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003ckse:widget data-widget-type=\"customText\" id=\"1005000000920131\" type=\"custom\"\u003e\u003c\/kse:widget\u003e\u003c\/div\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003eFosi Audio V3 Stereo Power Amplifier 300W x2 TPA3255 Class D Mini Speaker Amp 2 Channel Audio Amplifier for Passive Bookshelf\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style=\"font-size:26px\"\u003eFeature\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul style='font-family:\"Amazon Ember\", Arial, sans-serif;font-size:14px;font-weight:400;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(15, 17, 17);background-color:rgb(255, 255, 255);margin:0px 0px 0px 18px;margin-bottom:0px;margin-top:0px;margin-left:18px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;box-sizing:border-box' class=\"a-unordered-list a-vertical a-spacing-mini\" align=\"start\"\u003e\u003cli style=\"margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;list-style:disc;box-sizing:border-box\" class=\"a-spacing-mini\"\u003e\u003cp\u003e\u003cspan class=\"a-list-item\" style=\"background-color:rgb(255, 255, 255);color:rgb(15, 17, 17);font-size:22px\"\u003e\u003cstrong\u003eCompact Yet Powerful\u003c\/strong\u003e\u003c\/span\u003e\u003cspan class=\"a-list-item\" style=\"background-color:rgb(255, 255, 255);color:rgb(15, 17, 17);font-size:22px\"\u003e: The V3 mini power amplifier combines a minimalist design with exceptional performance. With a power output of up to 600W, it can effortlessly drive 2-8Ω speakers, delivering impressive sound quality. Its compact size makes it suitable for various applications, from bookshelves and desktop setups to home theaters\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul style='font-family:\"Amazon Ember\", Arial, sans-serif;font-size:14px;font-weight:400;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(15, 17, 17);background-color:rgb(255, 255, 255);margin:0px 0px 0px 18px;margin-bottom:0px;margin-top:0px;margin-left:18px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;box-sizing:border-box' class=\"a-unordered-list a-vertical a-spacing-mini\" align=\"start\"\u003e\u003cli style=\"margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;list-style:disc;box-sizing:border-box\" class=\"a-spacing-mini\"\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style=\"background-color:rgb(255, 255, 255);color:rgb(15, 17, 17);font-size:22px\"\u003eAudiophile-Grade Components\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"a-list-item\" style=\"background-color:rgb(255, 255, 255);color:rgb(15, 17, 17);font-size:22px\"\u003e: It features the TPA3255 high-end digital class D amp chip and utilizes premium Japanese NCC, ELNA, and German WIMA capacitors, and Japanese Sumida inductors for exceptional audio quality. With a SINAD rating of up to 88dB, an SNR of up to 110dB, and a low noise floor of only 140uV, it delivers exceptional clarity and low distortion\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul style='font-family:\"Amazon Ember\", Arial, sans-serif;font-size:14px;font-weight:400;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(15, 17, 17);background-color:rgb(255, 255, 255);margin:0px 0px 0px 18px;margin-bottom:0px;margin-top:0px;margin-left:18px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;box-sizing:border-box' class=\"a-unordered-list a-vertical a-spacing-mini\" align=\"start\"\u003e\u003cli style=\"margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;list-style:disc;box-sizing:border-box\" class=\"a-spacing-mini\"\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style=\"background-color:rgb(255, 255, 255);color:rgb(15, 17, 17);font-size:22px\"\u003eInnovative Cooling\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"a-list-item\" style=\"background-color:rgb(255, 255, 255);color:rgb(15, 17, 17);font-size:22px\"\u003e: The V3 stands out with its groundbreaking heat dissipation design. Equipped with vents on the casing's top and bottom, and a whole-body heatsink design, it efficiently dissipates heat, preventing damage to components and ensuring optimal performance\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul style='font-family:\"Amazon Ember\", Arial, sans-serif;font-size:14px;font-weight:400;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(15, 17, 17);background-color:rgb(255, 255, 255);margin:0px 0px 0px 18px;margin-bottom:0px;margin-top:0px;margin-left:18px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;box-sizing:border-box' class=\"a-unordered-list a-vertical a-spacing-mini\" align=\"start\"\u003e\u003cli style=\"margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;list-style:disc;box-sizing:border-box\" class=\"a-spacing-mini\"\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style=\"background-color:rgb(255, 255, 255);color:rgb(15, 17, 17);font-size:22px\"\u003eScalable and Fun\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"a-list-item\" style=\"background-color:rgb(255, 255, 255);color:rgb(15, 17, 17);font-size:22px\"\u003e: Tailor your sound experience by swapping the stock NE5532 op-amps. V3 is compatible with a variety of 8-pin dual op-amps like Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4559, LM4562, LME49720HA, etc. When replacing the op-amp, please make sure the chip is oriented correctly and the procedure is done accurately\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul style='font-family:\"Amazon Ember\", Arial, sans-serif;font-size:14px;font-weight:400;letter-spacing:normal;text-align:start;white-space:normal;color:rgb(15, 17, 17);background-color:rgb(255, 255, 255);margin:0px 0px 0px 18px;margin-bottom:0px;margin-top:0px;margin-left:18px;margin-right:0px;padding:0px;padding-bottom:0px;padding-top:0px;padding-left:0px;padding-right:0px;box-sizing:border-box' class=\"a-unordered-list a-vertical a-spacing-mini\" align=\"start\"\u003e\u003cli style=\"margin:0px;margin-bottom:0px;margin-top:0px;margin-left:0px;margin-right:0px;list-style:disc;box-sizing:border-box\" class=\"a-spacing-mini\"\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style=\"background-color:rgb(255, 255, 255);color:rgb(15, 17, 17);font-size:22px\"\u003eEnhanced Pre-out Functionality\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"a-list-item\" style=\"background-color:rgb(255, 255, 255);color:rgb(15, 17, 17);font-size:22px\"\u003e: The V3 features an optimized \"Pre-out\" design. The level is now controlled by the volume control, allowing for adjustable sound levels when connected to the \"Pre-out.\" This enhancement offers greater flexibility and convenience for users who prefer to fine-tune their audio experience\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style='font-size:22px;font-family:\"times new roman\", times, serif'\u003eHighlight:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cp\u003e\u003cspan style='font-size:18px;font-family:\"times new roman\", times, serif'\u003e1. Replaceable Op-Amp Chips: \u003c\/span\u003e\u003ca href=\"https:\/\/www.aliexpress.com\/item\/1005005552307902.html\" target=\"_self\" class=\"\"\u003e\u003cspan style='font-size:18px;font-family:\"times new roman\", times, serif'\u003eMUSES02\u003c\/span\u003e\u003c\/a\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003e, \u003c\/span\u003e\u003ca href=\"https:\/\/www.aliexpress.com\/item\/1005005552307902.html\" target=\"_self\" class=\"\"\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eOPA2134PA\u003c\/span\u003e\u003c\/a\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003e, \u003c\/span\u003e\u003ca href=\"https:\/\/www.aliexpress.com\/item\/1005005552307902.html\" target=\"_self\" class=\"\"\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eOPA2604AP\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-size:18px;font-family:\"times new roman\", times, serif'\u003e2. Passive Speakers + Pre-out   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style='font-size:18px;font-family:\"times new roman\", times, serif'\u003e3. Replaceable Knobs:\u003c\/span\u003e \u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eORANGE KNOB\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eNote: The \"Pre-out\" level is NOT controlled by the volume control as the V3 is not an integrated amplifier, so the sound is NOT adjustable when you are connected to the \"Pre-out\".\u003cbr\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e\u003cspan style=\"font-size:22px\"\u003eSpecifications:\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eMax Power Output: 300Wx2 @4Ω\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eSINAD: 88dB\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eSNR: ≥110dB\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eTerminating Impedance: 2-8Ω\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eTHD: 0.001%\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003ePower Amp Chip: TI TPA3255\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eOp-Amp: TI NE5532 x2\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003ePower Supply: 32V\/5A, 48V\/5A\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eInput Range: DC 24V-48V\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eFrequency Response Range: 20Hz-20kHz(±1.2dB)\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size:20px\"\u003eQA\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size:20px\"\u003eQ1: Is it normal for the V3 amplifier to get very hot during use?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eIt is normal for the device to generate heat, as the vents on the top and bottom, along with the whole-body heatsink design, enhance air circulation and heat dissipation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size:20px\"\u003eQ2: What is the difference between the 32V version and the 48V version?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eThe higher the voltage, the greater the amplifier's output power. Therefore, we recommend purchasing the 48V version.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003e\u003cstrong\u003eQ3:Which operational amplifiers does V3 support?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S9d20e03b16dd4e418e59a0bbfbedd87eu.png\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S4b849d0f388042129c6490bb2d7fb23d7.jpg\" slate-data-type=\"image\"\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S92e156cb2cc74321a2bb7e5cd638d743I.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S2477c285804e4f7087aa22e91b611ddeY.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sdee24bb21a4f40ea9241914b0d2d7ffb9.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sd5f1c863a79b4996a32d820ac02fee8ck.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sdefe9cf349334cc5a38f123acf10739aO.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Se52bc4291531486cb5dbd3f3d80948912.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sa94b6f30886b4638b6c05adc5212388cZ.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S9ab3aef001c14e61ba71b22cf656aae2i.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sa0601c9e3d164ed280198ed8993433ae1.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S046b5416b34448849a74f42fc3e4327dl.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sb74fa5033b2e4964b5466a8676899d1dl.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Se92fb2c05d5b476b96689cc715bd1054W.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S4030e1482c834b8580a8ef728750e6daE.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S7bbaba448a114be5939a37b4358193c9o.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sbcedacdefa50459c9efc920cf07ecf526.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S03e4453f780b4f229b4da0a4da8abd250.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S7a93a086031847e8a1555d258021dd81w.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sc49bbcd0f2ba4f2a8a02272052202cf0m.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S28e636fed0284851b703e467a743fa67k.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Se5f731d7a4ad461b88504fca76d90960W.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S5fe7934ae4cc4120b086f00852fe0159K.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sbac550f7a8be4997b23a86d5ff6ba1e7Y.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sbc33733851b94131a181bfe51648b1704.jpg\" slate-data-type=\"image\"\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sc677bf85ea1a46a694cf4b074c93a75fd.jpg\" slate-data-type=\"image\"\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style=\"font-size:20px\"\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003e\u003cstrong\u003eQ: The screws on the bottom are so tight it is impossible to remove with a normal hex wrench.Any tips how to get them loose？\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style='font-size:20px;font-family:\"Times New Roman\"'\u003e\u003cstrong\u003eA:\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eThe H2.0mm Allen Wrenchis able to loosen it.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ca href=\"https:\/\/www.youtube.com\/watch?v=feH5_22hQCA\" target=\"_self\" class=\"\"\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003ehttps:\/\/www.youtube.com\/watch?v=feH5_22hQCA\u003c\/span\u003e\u003c\/a\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003e 07:43 Rolling Op-Amps \u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style='font-size:20px;font-family:\"Times New Roman\"'\u003e\u003cstrong\u003eQ: Low volume on new V3\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan style='font-size:20px;font-family:\"Times New Roman\"'\u003e\u003cstrong\u003eA:\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style='font-size:20px;font-family:\"Times New Roman\"'\u003e Please ensure that you set the volume level of your audio source to 50% or higher, and adjust the V3 amplifier's volume to maximum. The V3 amplifier is equipped with a built-in logarithmic taper A Pot, which means the volume control becomes more responsive at higher levels (see the below diagram). If you encounter low volume issues, you can also consider using a preamp to address this.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cimg width=\"750\" height=\"auto\" src=\"https:\/\/ae01.alicdn.com\/kf\/Sd7650ce948a14a1ab933c00b9d6252e6w.png\" slate-data-type=\"image\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003e\u003cstrong\u003eQ: How can I connect an active subwoofer and control the volume if it s constant output?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eA:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003e Connect a single 3.5mm cable from the preout to the audio input port on the active subwoofer. You can refer to the tutorial video at this link: \u003c\/span\u003e\u003ca href=\"https:\/\/youtu.be\/WhYpHkovCWs%20\" target=\"_self\" class=\"\"\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003ehttps:\/\/youtu.be\/WhYpHkovCWs \u003c\/span\u003e\u003c\/a\u003e\u003cspan style='font-size:10.5pt;font-family:\"times new roman\", times, serif'\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003e(go to 2:44 for the PRE OUT demonstration).\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eThe \"pre-out\" is a fixed output, you could control the volume by the input device connected to the V3.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003e\u003cstrong\u003eQ: I was just wondering what the differences were by using the different op amps?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eA: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eDifferent op-amps can produce varying sound qualities. You can refer to this video showing different dual op-amps for comparison:\u003c\/span\u003e\u003ca href=\"https:\/\/www.youtube.com\/watch?v=nrqVYE4_v1M\" target=\"_self\" class=\"\"\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003ehttps:\/\/www.youtube.com\/watch?v=nrqVYE4_v1M\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan style='color:rgb(244, 78, 59);font-size:20px;font-family:\"times new roman\", times, serif'\u003eYou can consider replacing it with op-amps like the SS3602, MUSES02, available on our official website, or options like ORACLE II-02 and LME49720, for different sound.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003eQ: I intend to use the V3 as a power amp and control the volume with the preamplifier.  Is the volume on the V3 a passive attenuator or an active gain circuit? \u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e\u003cspan style='color:rgb(0, 0, 0);font-size:20px;font-family:\"times new roman\", times, serif'\u003eA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan style='color:rgb(0, 0, 0);font-size:20px;font-family:\"times new roman\", times, serif'\u003eThe volume on the V3 is an active gain circuit, you can set the V3 amp at the 3:00 position, then turn up the preamp controls to your comfortable listening level.\u003c\/span\u003e\u003cspan style=\"color:rgb(0, 0, 0);font-size:10.5pt;font-family:Verdana\"\u003e\u003cbr\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003ckse:widget data-widget-type=\"customText\" id=\"1005000024963203\" type=\"custom\"\u003e\u003c\/kse:widget\u003e\u003c\/div\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cscript\u003ewindow.adminAccountId=238989705;\u003c\/script\u003e\n","brand":"Fosi Audio Official Store","offers":[{"title":"Australia \/ no power supply","offer_id":51295992807706,"sku":"12000046508891147_6","price":100.0,"currency_code":"USD","in_stock":true},{"title":"Australia \/ with32V Power Supply","offer_id":51295993135386,"sku":"12000046508891153_16","price":100.0,"currency_code":"USD","in_stock":true},{"title":"Australia \/ with48V Power Supply","offer_id":51295993200922,"sku":"12000046508891159_18","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0936\/0359\/4522\/files\/S37fcb88955c643e7a0aae4996bbab169l.webp?v=1762656778","url":"https:\/\/merlinhk.com\/products\/id3256805418717043","provider":"YZJGlobal","version":"1.0","type":"link"}