Name: Fosi Audio V3 Mono Monoblock Power Amplifier TPA3255
Brand: Fosi Audio
SKU: B0D31M3DXY
Price: 129.99 USD
Availability: InStock
Rating: 4.7 (420 reviews)

Overview

Fosi Audio V3 Mono — mini monoblock power amp with balanced XLR/TRS and RCA inputs for building multi-channel HiFi systems.

At a Glance

Mini Monoblock Amplifier
Innovative Cutting-Edge Technology
Audiophile-Grade Components
Advanced Cooling

Key Features

Mini Monoblock Amplifier: Crafted for HiFi audiophiles, the V3 Mono allows you to drive a single passive speaker with one amp, delivering up to 240W @4Ω of rated power. It offers the flexibility to build your home audio 2/3/4/5-channel system effortlessly. The V3 Mono can serve as a power amplifier for multi-channel AVRs, complementing the output power to easily drive high-power speakers in home theater systems.
Innovative Cutting-Edge Technology: Fosi Audio has achieved a technological breakthrough through independent research and development by applying PFFB (Post-Filter Feedback) technology to the V3 Mono for the first time. This effectively overcomes the common load dependency issues of Class-D amplifiers, improving distortion and enhancing frequency response, thereby significantly enhancing sound quality and performance.
Audiophile-Grade Components: The V3 Mono incorporates the high-end TPA3255 Class-D amp chip, paired with well-known components such as Japanese Nichicon filter capacitors, ELNA capacitors, German WIMA capacitors, and Japanese Sumida inductors, etc. Additionally, it features an upgraded four-layer PCB. This combination not only ensures high power output but also achieves a THD as low as 0.006%, a SINAD of 101dB, and an SNR of 123dB. As a result, the fidelity and quality of the audio are assured.
Advanced Cooling: Utilizing Fosi Audio's pioneering full-body heat dissipation design, the TPA3255 amplifier chip is placed at the bottom and tightly integrated with the chassis, allowing heat to be effectively dissipated through the casing. Coupled with dual side ventilation holes that enhance internal airflow, this ensures the V3 Mono can deliver stable, high-power output over extended periods.
User-Friendly Design: Supports both XLR/¼" TRS balanced and RCA single-ended(with gain selection) inputs, with an easy toggle switch for selection. Additionally, it features an auto power/signal sensing mode to enhance energy efficiency. You can also customize your preferred sound signature by replacing the stock NE5532 op-amps, supporting DIP8 dual discrete op-amps such as Sparkos SS3602, MUSES02, OPA2604, Burson V5i, V6, V7, and more.
V3 mono stereo audio component mini power monoblock amplifier 2 channel amplifier single channel 2/2.1/3/4/5 channel class d amp tpa3255 for home theater desktop outdoor bookshelf Tower floorstanding passive speakers ZA3.

Who It's For

Multi-channel HiFi builds, active/passive bi-amping, and listeners who want one dedicated monoblock per channel for cleaner power and flexible XLR/RCA inputs.

Why Choose the V3 Mono

The V3 Mono is part of the Fosi Audio lineup of compact HiFi amplifiers, DACs, and desktop audio components. It focuses on practical connectivity, measurable performance, and value — the same product family featured on the official Fosi Audio store and Amazon. Use this page to review specs and photos, then buy through Amazon when you are ready.

Why Fosi Audio

Fosi Audio builds compact HiFi amplifiers, DACs, and desktop audio gear that punch above their price. From TPA3255 power amps to balanced DAC preamps and gaming DAC/AMPs, the lineup focuses on clean sound, useful connectivity, and value — the same products featured on Amazon.