{"product_id":"the-ampere-loom-fosi-v3-mono-amplifier","title":"The Ampere Loom | Fosi Audio V3 Mono TPA3255 Power Amplifier, 240W","description":"\u003cdiv class=\"product-narrative\"\u003e\n\u003cp\u003e\u003cstrong\u003eOne channel, done properly.\u003c\/strong\u003e The audio industry spent two decades selling channel counts and then quietly discovered what recording studios had known since the tape era: a single amplifier built around a single channel, with its own power supply and its own thermal budget, outperforms a shared multi-channel chassis almost every time. Separation is not a marketing word when it is physical. The V3 Mono takes that principle and puts it on a desktop, then lets you stack it until you have as many channels as you actually need.\u003c\/p\u003e\n\u003cp\u003eThe engine is a Texas Instruments TPA3255 Class-D chip running in a monoblock topology, with post-filter feedback - PFFB - applied to correct the load-dependent behaviour that limits most low-cost Class-D designs. Around the chip sit Japanese NICHICON and ELNA capacitors, German WIMA film capacitors and Japanese Sumida inductors, because the difference between a competent amplifier and a transparent one is almost always in the passives rather than the silicon. Measured performance is a SINAD of up to 101dB on the balanced input and 93dB on RCA, a signal-to-noise ratio of 123dB, a dynamic range of 123dB and a noise floor of 31 microvolts. Rated output is 240 watts into four ohms from the supplied 48V\/5A supply, falling to 100 watts from a 32V supply, with a frequency response that stays within plus or minus 0.06dB from 10Hz to 30kHz.\u003c\/p\u003e\n\u003cp\u003eAround that core, the details are the ones that matter day to day. Inputs are switchable between RCA and balanced XLR or quarter-inch TRS, and the RCA path offers two gain settings - 19dB and 25dB - so that a quiet source and a hot source can both be matched to the load without adding a preamp. A front-panel toggle changes input mode; an auto on and off circuit means the amplifier follows your source without a trigger cable; and the heatsink is integrated directly with the amplifier chip rather than bolted on afterwards, which is why it runs warm but stable rather than hot and unhappy. The output stage is socketed, so swapping the DIP8 op-amps for Sparkos SS3602, MUSES02, OPA2604, LM4562 or comparable parts is a screwdriver job rather than a soldering iron job. Start with one V3 Mono driving one speaker. Add a second for stereo, a third for a centre channel, a fourth and fifth for surrounds. A single 48V\/10A supply can feed two units simultaneously, which is why an expandable system costs less than it should.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eAmplification is not a feature list. It is a discipline, and it is best practised one channel at a time.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003chr style=\"margin:22px 0;border:0;border-top:1px solid #eee;\"\u003e\u003cdiv class=\"product-features\"\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding:0;\"\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e✦ Texas Instruments TPA3255 Class-D monoblock with post-filter feedback (PFFB)\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e✦ 240W into 4 ohms from the supplied 48V\/5A power supply\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e✦ Japanese NICHICON and ELNA capacitors, German WIMA film caps, Sumida inductors\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e✦ 101dB SINAD on balanced input, 93dB on RCA, with a 123dB signal-to-noise ratio\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e✦ Switchable RCA, XLR and quarter-inch TRS inputs with 19dB and 25dB RCA gain settings\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e✦ Socketed DIP8 op-amps for user-swappable sound signature\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e✦ Stackable from one channel to 2, 2.1, 3, 4 or 5 channel configurations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding:0;\"\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eAmplifier Chip:\u003c\/strong\u003e Texas Instruments TPA3255, Class-D monoblock with PFFB\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eChannel Configuration:\u003c\/strong\u003e 1.0 per unit, stackable to 2 \/ 2.1 \/ 3 \/ 4 \/ 5 channels\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eRated Output:\u003c\/strong\u003e 240W at 4 ohms (48V\/5A), 100W at 4 ohms (32V\/5A)\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e RCA, balanced XLR, 6.35mm TRS\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e Speaker terminals (banana plug or bare wire)\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eSINAD:\u003c\/strong\u003e 101dB XLR \/ 93dB RCA\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eSignal to Noise Ratio:\u003c\/strong\u003e 123dB or better\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eNoise Floor:\u003c\/strong\u003e 31 microvolts\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eTHD:\u003c\/strong\u003e Below 0.006 percent\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eTerminal Impedance:\u003c\/strong\u003e 2 to 8 ohms\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 10Hz - 30kHz (plus or minus 0.06dB)\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eInput Voltage Range:\u003c\/strong\u003e DC 32V - 48V (48V\/5A supply included)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-applications\"\u003e\n\u003ch3\u003eApplication Scenarios\u003c\/h3\u003e\n\u003cp\u003eThe natural home for the V3 Mono is a desktop system that has outgrown an integrated amplifier. One unit per speaker replaces a shared stereo chassis and removes crosstalk between channels; a pair with a compact DAC forms a complete nearfield chain. Home theatre builders use three units for left, centre and right and then add pairs for surrounds, feeding each speaker its own supply and its own thermal path. Vinyl listeners run a phono stage into the RCA input at 19dB gain and use the balanced input at 25dB for a hotter line source. DIY audiophiles who want to change the sound without changing the amplifier simply change the socketed op-amps, and because a single 48V\/10A supply drives two units, doubling the channel count does not double the desk clutter.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-faq\"\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What is post-filter feedback and why does it matter?\u003c\/p\u003e\n\u003cp style=\"margin:4px 0 0 0;\"\u003ePFFB takes feedback after the output filter rather than before it, which corrects the frequency response drift that ordinary Class-D designs exhibit when the speaker load changes. The practical result is an amplifier that sounds the same into 4 ohms as it does into 8.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Do I need one V3 Mono per speaker?\u003c\/p\u003e\n\u003cp style=\"margin:4px 0 0 0;\"\u003eYes. Each V3 Mono is a monoblock - a single-channel amplifier. A stereo pair requires two units. A 2.1 system uses two for the speakers plus one for a subwoofer, and so on up to five channels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can I change the op-amps without soldering?\u003c\/p\u003e\n\u003cp style=\"margin:4px 0 0 0;\"\u003eThe DIP8 op-amps sit in sockets. Compatible parts include Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, LM4562 and LME49720HA, among others.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does the amplifier run hot?\u003c\/p\u003e\n\u003cp style=\"margin:4px 0 0 0;\"\u003eIt runs warm, and that is normal for a Class-D design of this power. The amplifier chip heatsink is integrated with the chassis so heat is removed directly. Allow clearance above and behind the unit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What power supply does it need?\u003c\/p\u003e\n\u003cp style=\"margin:4px 0 0 0;\"\u003eA 48V\/5A supply is included and delivers the full 240W rating. A single 48V\/10A supply can drive two V3 Mono units simultaneously, which is the cheaper way to build a multi-channel system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What is the difference between the RCA gain settings?\u003c\/p\u003e\n\u003cp style=\"margin:4px 0 0 0;\"\u003eThe RCA input can be set to 19dB or 25dB. Use 19dB for normal line sources and 25dB for quieter sources such as a phono stage, so the amplifier reaches full output without introducing noise upstream.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-gallery\" style=\"margin-top:30px;text-align:center;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S77aefe694cd34355ab8a08ebe24812f1h_934786ee-1a8f-410b-9e96-3ffef095c59b.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/A0fa0ab6b91a547cf9221197fdfa65d2dA_eca980ed-237a-494d-abab-95fc2147d022.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Afc6d03a1f86a4cf496e0a9b6fb13a718q_ca761a61-1cd0-47d0-ab3d-b29745fe7399.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/A029e020e33f145f2a4b91638462457849_ed53f742-1acb-450a-9972-f7527d6f8072.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Ad662bf5f70dd4546820213a2d6d47204q_4deaba8b-354f-416c-8999-21467f96d6fb.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Ae172c09eb04448cb8d5e12d5cefeeac7e_63b43537-b262-4498-ab04-fd9f7227c2f4.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/A87f38b82b51745848073f0ece7f7f7cfM_3481a0d3-200f-4efe-825a-2b6a4601b94f.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Ad314443154f74f04a75a49f15c16f854U_7acd6c9d-6f75-4375-a8f9-2ebc273a0a4c.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Abb8400f5b62648699eadc8c0efcf71eaA_da6e7703-4f45-4419-a4f9-352507496182.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Ad892c604065a47fbacfab40fb5588c41N_b7d74d13-9c63-4a74-a4fd-64ccbdc8c564.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Acf50c55f8685464eb55b7e2529f89133G_ad715dc6-5cbc-4494-b3a5-b4d11f77b1e4.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/A038e0c3ee8ad4680b0055fc20eb5f6722_1160539a-abb4-47cc-be51-298f80ba6d11.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/A702b66f2a96e4625a1c83e64a64c3cbf4_2af7f015-3c33-497e-b3ba-26def3a8ca99.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/A3c93f7142db54d9aa823fff5041fadfb8_aebf4c24-27e9-4fb5-9e2b-34e540ecba01.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/A170cb7c598914729a11294ffda2a57eda_3d9c71c2-f4a6-4ed0-8df9-4625e6db0ae2.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Af9184885af0642d7803b07f525afcda6v_147c9606-3a00-420e-bac2-bd1e33df3dad.webp?v=1791424215\" alt=\"Product image\" style=\"max-width:100%;margin-bottom:14px;border-radius:8px;\"\u003e\n\u003c\/div\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"Product\", \"name\": \"The Ampere Loom | Fosi Audio V3 Mono TPA3255 Power Amplifier, 240W\", \"description\": \"One channel, done properly. 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