Specifications:

Feature	Details
Channel	1.0
Amplifier Chip	Texas Instruments TPA3255
Input	RCA, XLR, ¼" TRS
Output	Speaker Output (supports banana plug or bare wire connection)
SINAD	XLR: 101dB ; RCA: 93dB
SNR	≥123dB
Dynamic Range	≥123dB
THD	<0.006%
Gain	XLR / ¼" TRS: 20dB RCA: 25dB, 31dB
Terminal Impedance	2-8Ω
Rated Power Output	48V / 5A — 240W @ 4Ω 32V / 5A — 100W @ 4Ω
Frequency Response	10Hz – 30kHz (±0.06dB)
Input Voltage Range	DC 32V – 48V
Standard PSU	48V / 5A

Fosi Audio V3 Mono Monoblock Power Amplifier

Engineered for Audiophiles — Optimal Choice for Home Audio Systems

Following the success of the V3 stereo amplifier in 2023, Fosi Audio gathered valuable feedback from audio enthusiasts worldwide and refined the concept into something more focused, more powerful, and more versatile — the V3 Mono.

Built for serious HiFi listeners, the V3 Mono is a compact monoblock power amplifier designed to deliver clean, powerful sound for home audio, desktop, and home theater systems. Whether you are building a stereo setup or a full multi-channel system, the V3 Mono offers the flexibility and performance audiophiles demand.

• Input: RCA, XLR, ¼” TRS
• Output: Passive Speaker (banana plug or bare wire supported)
• SINAD: XLR 101dB / RCA 93dB
• SNR: ≥123dB
• Rated Power Output: 240W @ 4Ω (48V/5A)

Key Features

Mini Monoblock Amplifier for HiFi Systems

Designed for audiophiles, each V3 Mono powers a single passive speaker with up to 240W at 4Ω. Use one unit for mono, two for stereo, or expand easily into 2.1 / 3 / 4 / 5-channel home audio and home theater systems.

Advanced PFFB Technology

The V3 Mono features Fosi Audio’s independently developed PFFB (Post-Filter Feedback) technology, improving frequency response, reducing distortion, and solving the load dependency issues commonly found in Class-D amplifiers for more accurate and stable sound reproduction.

Audiophile-Grade Components

Built with premium internal components and the powerful TPA3255 Class-D amplifier chip, the V3 Mono is engineered for high fidelity performance with ultra-low distortion and excellent signal purity.

Advanced Cooling Design

The V3 Mono uses a full-body heat dissipation design with the TPA3255 chip directly integrated into the chassis for efficient cooling. Combined with dual side ventilation, it ensures stable high-power output during extended listening sessions.

User-Friendly & Expandable

Supports XLR / ¼” TRS balanced and RCA single-ended inputs with easy source switching and gain selection. It also includes auto power/signal sensing for better energy efficiency and supports op-amp rolling for sound customization.

Premium Internal Components

NICHICON Capacitors (Japan) Ensure superior sound clarity, long-term durability, and stable electrical performance for better audio fidelity.

WIMA Capacitors (Germany) Deliver excellent signal stability and refined sound performance for a more immersive listening experience.

Sumida Inductor (Japan) Improves signal purity and reduces unwanted noise for cleaner, more detailed sound output.

ELNA Capacitors (Japan) Enhance clarity, consistency, and overall richness across the full listening range.

Description

Mini Monoblock Amplifier:
Crafted for HiFi audiophiles, the V3 Mono is a dedicated monoblock amplifier designed to power a single passive speaker with precision and control. Delivering up to 240W at 4Ω, it provides an easy and flexible way to build stereo or multi-channel home audio systems.

Innovative Cutting-Edge Technology:
Fosi Audio introduces PFFB (Post-Filter Feedback) technology to the V3 Mono, significantly improving Class-D amplifier performance by reducing distortion, enhancing frequency response, and minimizing speaker load dependency.

Audiophile-Grade Components:
Powered by the premium TPA3255 Class-D amplifier chip and paired with carefully selected components including Nichicon, ELNA, WIMA, and Sumida, the V3 Mono delivers exceptional sonic performance with THD as low as 0.006%, SINAD up to 101dB, and SNR reaching 123dB.

Advanced Cooling:
Its full-body heat dissipation design integrates the amplifier chip directly into the chassis, while dual side vents improve airflow to ensure reliable high-power performance during long listening sessions.

User-Friendly Design:
Supports XLR, ¼” TRS balanced, and RCA single-ended inputs with convenient switching and gain selection. The V3 Mono also features auto power/signal sensing and supports op-amp rolling with DIP8-compatible options such as Sparkos SS3602, MUSES02, OPA2604, Burson V5i, V6, and V7 for personalized sound tuning.

Ideal For

• HiFi Stereo Systems
• Home Theater Systems
• Desktop Audio Setups
• Bookshelf Speakers
• Tower Speakers
• Passive Speaker Systems
• Multi-Channel Audio Expansion