Fosi Audio V3 Mono Power Amplifier

About The Fosi Audio V3 Mono Power Amplifier

The Fosi Audio V3 Mono Power Amplifier is a compact little monoblock that brings cutting-edge tech and audiophile-grade components together in one sleek package. Designed with PFFB technology to boost sound purity and efficiency, it’s perfect for driving a single passive speaker or building anything from a simple stereo setup to a full-blown multi-channel home theatre system. With its powerful TPA3255 chip, premium capacitors, and clever cooling design, the V3 Mono delivers impressive performance and crystal-clear audio, all while staying cool and efficient for those long listening sessions.

Mini Monoblock Amplifier

Crafted for audio enthusiasts, the V3 Mono allows you to drive a single passive speaker with one amp, delivering up to 240 Watts @ 4Ω. 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 theatre 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

The V3 Mono 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.

Our Review

The Fosi Audio V3 Mono Power Amp might be small, but it hits way above its weight. This little beast is built with some seriously smart tech - PFFB - so it sidesteps the usual Class-D “meh” sound and delivers clean, punchy audio that’s full of detail. With up to 240 watts into a single 4Ω speaker, it’s ready to power.

Inside, it’s rocking the high-end TPA3255 chip and premium parts from Nichicon, ELNA, WIMA, and Sumida; translation: crystal-clear sound, zero fuss, and built to last. Plus, its clever cooling keeps it going during those marathon listening sessions. Balanced or unbalanced inputs? No problem, it’ll slot right into pretty much any system you’ve got.

Main Features & Specifications

• Design: Compact High Performance Mono Power Amplifier – Sold Individually
• Output Power: 1 x 240 Watts @ 4Ω
• Terminating Impedance: 2-8Ω
• Input Modes: Single Ended RCA, Balanced XLR, ¼” TRS
• Output Mode: Speaker Output (supports banana plug or bare wire connection)
• Frequency Range: 10Hz-30kHz (±0.06dB)
• (THD) Total Harmonic Distortion: ≤0.006%
• (SNR) Signal to Noise Ratio: ≥123dB
• Dynamic Range: ≥123dB
• (SINAD) Signal to Noise and Distortion
  • RCA: 93dB
  • XLR: 101dB
• Gain
  • XLR/¼” TRS: 20dB
  • RCA: 25dB, 31dB (Selectable)
• Chip Set: Texas Instruments TPA3255 Amp Chip
• Power Supply: 48V 5A
• DC Input Range: 32-48V
• Included Accessories: 48V/5A Power Adaptor, User Manual
• Dimension (WxHxD): 105 x 35 x 142mm
• Weight: 0.5 kg
• Manufacturer's Warranty: 2 Years

Note: Features & Specifications Subject To Change Without Notice. E&OE.