{"product_id":"the-monoblock-tpa3255-mono-power-amplifier","title":"The Monoblock | 240W TPA3255 Mono Power Amplifier with PFFB and Swappable Op-Amps","description":"\u003cdiv class=\"product-narrative\"\u003e\n\u003cp\u003eMost desktop amplifiers try to be everything at once and end up compromising each channel they touch. A monoblock takes the opposite route: one amplifier, one speaker, one power supply, no shared ground and no crosstalk between channels. The V3 Mono applies that discipline at desk scale. Add one unit to each speaker and the system grows channel by channel, from a single block to 2, 2.1, 3, 4 or 5 channels, without ever asking one circuit board to do two jobs at once.\u003c\/p\u003e\n\u003cp\u003eThe load bearing part is a Texas Instruments TPA3255 Class D chip running with Post Filter Feedback, a correction loop that measures the output after the filter and pulls it back toward the intended signal. The measured result is a SINAD of 101dB through the balanced input and 93dB through the unbalanced input, a signal to noise ratio of 123dB and total harmonic distortion below 0.006 percent. In plain terms, the noise floor sits at 31 microvolts, which is quiet enough that sensitive horn or planar speakers reveal the recording rather than the amplifier.\u003c\/p\u003e\n\u003cp\u003eChannel configuration is handled by two input paths rather than a menu. Balanced XLR and 6.35mm TRS share one set of sockets, unbalanced RCA sits on the other, and the RCA input carries a gain switch between 19dB and 25dB so a low output phono stage or a quiet streamer can be brought up to level without a preamplifier. Speaker connections accept banana plugs or bare wire, and the load tolerance covers 2 to 8 ohms, which means the amplifier will drive awkward low impedance speakers that smaller desktop units refuse.\u003c\/p\u003e\n\u003cp\u003eInside, the parts list reads like a deliberate choice rather than a cost exercise: Japanese NICHICON and ELNA capacitors, German WIMA capacitors and Sumida inductors. The op-amp sits in a DIP8 socket, so Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, LM4562 and LME49720HA chips can be swapped in without a soldering iron. Auto power on and off follows the signal, the chassis itself acts as the heatsink so the amplifier holds full output for hours, and the supply accepts anything from DC 32V, where it delivers 100W into 4 ohms, up to DC 48V, where it reaches 240W into 4 ohms.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eOne amplifier, one speaker, and nothing shared between them.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr style=\"margin: 24px 0; border: 0; border-top: 1px solid #eaeaea;\"\u003e\n\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: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e✦ Monoblock design: one amplification channel per unit, scaled to 2, 2.1, 3, 4 or 5 channels by adding units\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e✦ Texas Instruments TPA3255 Class D chip with Post Filter Feedback for measured linearity\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e✦ SINAD 101dB on the balanced input and 93dB on RCA, with a 123dB signal to noise ratio and a 31 microvolt noise floor\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e✦ Balanced XLR and 6.35mm TRS inputs alongside RCA, with RCA gain switchable between 19dB and 25dB\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e✦ Swappable DIP8 op-amp socket accepting Sparkos, MUSES02, OPA2604, OPA2134PA and other popular chips\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e✦ Audiophile component set including NICHICON, ELNA, WIMA and Sumida parts, with auto power on and off\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\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: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eAmplifier Chip:\u003c\/strong\u003e Texas Instruments TPA3255 Class D with PFFB\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eChannel:\u003c\/strong\u003e 1.0 monoblock\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eRated Power Output:\u003c\/strong\u003e 240W into 4 ohms with a 48V supply, 100W into 4 ohms with a 32V supply\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eSINAD:\u003c\/strong\u003e 101dB (XLR), 93dB (RCA)\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eSignal to Noise Ratio:\u003c\/strong\u003e 123dB\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eDynamic Range:\u003c\/strong\u003e 123dB\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eTotal Harmonic Distortion:\u003c\/strong\u003e Below 0.006 percent\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eGain:\u003c\/strong\u003e 20dB on XLR and 6.35mm TRS, 19dB or 25dB on RCA\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eSpeaker Impedance:\u003c\/strong\u003e 2 to 8 ohms\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 10Hz to 30kHz, within plus or minus 0.06dB\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eInput Voltage Range:\u003c\/strong\u003e DC 32V to 48V\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e Balanced XLR, 6.35mm TRS, RCA\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e Speaker terminals accepting banana plugs or bare wire\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eOp-Amp:\u003c\/strong\u003e DIP8 socket, user swappable\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eCooling:\u003c\/strong\u003e Chassis integrated heatsink with ventilated sides\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f2f2f2;\"\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e CE\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-applications\"\u003e\n\u003ch3\u003eWhere It Belongs\u003c\/h3\u003e\n\u003cp\u003eThis amplifier belongs on a desk in front of two bookshelf speakers, in a nearfield studio setup, or in a small listening room where a full size power amplifier would be absurd. It also fits home theatre builds where each channel is better served by its own block, and DIY audio projects where the op-amp socket and the swappable supply make the unit a platform rather than a sealed box. If you own efficient speakers and want the noise floor gone, the monoblock arrangement is the part that matters: each driver gets a dedicated supply and there is nothing to bleed between left and right.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq\"\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why choose a monoblock instead of a normal stereo amplifier?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA monoblock gives each speaker its own amplifier, power supply and ground reference. That removes crosstalk between channels and reduces the load on the supply, which is audible as a cleaner image and a lower noise floor on efficient speakers. It also lets the system grow one channel at a time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How much power do I actually get?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe output depends on the supply. With a 48V supply the amplifier delivers 240W into 4 ohms. With a 32V supply it delivers 100W into 4 ohms. Both figures relate to a single channel, since this is a monoblock design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I change the sound signature?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The op-amp sits in a DIP8 socket, so chips such as Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, LM4562 and LME49720HA can be fitted without soldering. That is the most direct way to tune the presentation to taste.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does it get hot?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe chassis is part of the cooling design, so the surface reaches a noticeable temperature during long sessions. That is heat transferring away from the amplifier chip as intended. The case has vented sides for airflow, and a small fan can be added if the amplifier runs at full output for hours in a closed cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need a preamplifier?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNot necessarily. Balanced XLR, 6.35mm TRS and RCA inputs are all present, and the RCA path offers 19dB or 25dB of gain, so most sources can connect directly. A preamplifier is only needed if your source has very low output or you want switching between several sources.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is included with a set?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eConfiguration depends on the bundle you choose. Options include the amplifier on its own, a set with a 48V 5A power supply, and 48V 10A supply versions with a power filter or a fan. For a stereo pair, one 48V 10A supply can feed two units.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\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.webp?v=1790907345\" alt=\"The Monoblock | 240W TPA3255 Mono Power Amplifier with PFFB and Swappable Op-Amps\" style=\"max-width:100%;height:auto;margin:8px 0;border-radius:6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/A0fa0ab6b91a547cf9221197fdfa65d2dA.webp?v=1790907345\" alt=\"The Monoblock | 240W TPA3255 Mono Power Amplifier with PFFB and Swappable Op-Amps\" style=\"max-width:100%;height:auto;margin:8px 0;border-radius:6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Afc6d03a1f86a4cf496e0a9b6fb13a718q.webp?v=1790907345\" alt=\"The Monoblock | 240W TPA3255 Mono Power Amplifier with 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