Fosi Audio V3 Mono Monoblock Power Amplifier - 48v DC

Fosi Audio V3 Hi-fi Mono Power Amplifier In Black With 48v PSU

Overview

The Fosi Audio V3 Mono (48 V) is a compact, high-fidelity Class D power amplifier designed to deliver effortless drive, exceptional control, and the kind of musical realism that makes every track come alive. It distils Fosi Audio’s clean-power design philosophy into a single, fully balanced channel that brings refinement and authority to any desktop or home-audio system.

At its heart lies the Texas Instruments TPA3255 amplifier chip — the same high-performance core found in many of Fosi’s flagship models. In the V3 Mono amplifier, this chipset is tuned for maximum transparency and dynamic headroom, producing 240 watts @ 4 ohms with the included 48 V / 5 A power supply. The result is a sound that’s open, powerful, and remarkably pure. Bass notes arrive tight and defined, the midrange flows naturally, and treble remains smooth and extended without fatigue. Whether you’re powering bookshelf speakers or floor-standers, the V3 Mono amp from Fosi delivers a clear sense of space and drive that belies its size.

Connectivity is both flexible and purposeful. The Fosi Audio V3 Mono amplifier accepts balanced XLR / ¼-inch TRS and unbalanced RCA inputs, letting it integrate seamlessly with DACs, preamps, and studio gear. Gain settings are selectable, providing optimal performance for either balanced or single-ended sources. Gold-plated binding posts accept banana plugs or bare wire for secure, low-resistance connections, and the front panel offers intuitive controls with clear indicators for power and signal status.

Every component inside the Fosi V3 Mono amp has been carefully chosen for sonic integrity. Nichicon, WIMA, and ELNA capacitors work alongside precision resistors and Sumida inductors to maintain linearity and low noise. With THD + N below 0.006 percent and SNR ≥ 123 dB, this amplifier stays silent in the background, allowing the music’s texture and depth to shine through. A four-layer PCB ensures signal stability, while advanced protection circuits guard against thermal overload or DC offset.

Built from CNC-machined aluminium, the chassis doubles as a full-body heatsink, ensuring silent, efficient cooling during long listening sessions. Compact and elegantly proportioned, it fits perfectly beside Fosi’s other modular components such as the ZA3 and ZD3, enabling scalable, high-performance stereo or dual-mono setups.

For Groove Central listeners, the Fosi Audio V3 Mono amplifier (48 V) embodies precision and emotion in equal measure — a pure expression of Fosi’s “Audio Simplified” design ethos. It’s more than just a power amp; it’s a building block for systems where detail, dynamics, and musical honesty truly matter.

Key Features

• The Texas Instruments TPA3255 Class D chip delivers high-efficiency, low-distortion power.

• Up to 240 W @ 4 Ω (48 V / 5 A PSU included) for effortless speaker control.

• Balanced XLR / TRS and RCA inputs for flexible system integration.

• Gain options tailored for balanced or single-ended sources.

• THD + N < 0.006 % and SNR ≥ 123 dB for silent, transparent operation.

• Premium Nichicon, WIMA and ELNA capacitors with Sumida inductors ensure stable performance.

• Four-layer PCB design reduces noise and enhances channel separation.

• Solid CNC-machined aluminium chassis acts as a silent heatsink.

• Comprehensive protection against over-current, temperature, and DC offset.

• Ideal for dual-mono or desktop hi-fi systems seeking compact, high-power accuracy.

Technical Stuff 

Fosi Audio V3 Mono Amplifier - A Visual Introduction ... 

For More Information

Visit the manufacturer's website.

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