---
product_id: 641781472
title: "Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs"
brand: "fosi audio"
price: "$616"
currency: NZD
in_stock: true
reviews_count: 12
category: "Fosi Audio"
url: https://www.desertcart.nz/products/641781472-fosi-audio-v3-mono-power-amplifier-for-home-audio-speakers
store_origin: NZ
region: New Zealand
---

# 240W peak power @4Ω Advanced full-body heat dissipation Supports XLR/RCA balanced inputs Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs

**Brand:** fosi audio
**Price:** $616
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your sound game with Fosi V3 Mono — where power meets precision.

## Quick Answers

- **What is this?** Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs by fosi audio
- **How much does it cost?** $616 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/641781472-fosi-audio-v3-mono-power-amplifier-for-home-audio-speakers)

## Best For

- fosi audio enthusiasts

## Why This Product

- Trusted fosi audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Cool Under Pressure:** Innovative full-body heat dissipation keeps your amp running stable during marathon listening sessions.
- • **Powerhouse Precision:** Unleash 240W of crystal-clear Class-D amplification for your ultimate HiFi setup.
- • **Flexible Connectivity:** Seamlessly switch between balanced XLR and RCA inputs with gain control for tailored audio performance.
- • **Audiophile-Grade Components:** Premium TPA3255 chip with Japanese Nichicon & German WIMA capacitors for ultra-low distortion and pristine sound.
- • **Customizable Sound Signature:** Swap out op-amps like Sparkos or Burson to craft your unique sonic fingerprint.

## Overview

The Fosi Audio V3 Mono is a compact, high-performance Class-D amplifier delivering up to 240W at 4Ω, designed for audiophiles building multi-channel home theater or HiFi systems. Featuring cutting-edge PFFB technology, premium components, and advanced heat dissipation, it ensures low distortion, high fidelity, and stable operation. With versatile XLR and RCA inputs plus customizable op-amps, it offers professional-grade flexibility and sound personalization.

## Description

Crafted for audiophiles, the V3 Mono amplifier delivers up to 240W to drive a single speaker. Its PFFB technology provides a clean, high-quality audio experience.

Review: Good unit, but heat issues. - Wasn't sure if these were going to be a 4 or 5 star review. As other commentators have said, they do run hot; burning hot, over 60C. They sit at 40C in standby. I worry about the heat affecting electrolytic capacitor lifespan. I bought four for my bi-amping project, (I was replacing my 4 channel 3886 hybrid 'scraplifier') and the quiescent current draw must have been enormous. So, on advice, I replaced the 48v psu (x4) with a 32v psu (x4). It added an extra hundred quid to the project, but I was eight hundred in to it by now, so it seemed rude not to. And, WOW, I'm still producing 100w (x4) into 8 ohms. And with a usb dac, everything reaches FSD (full volume) at the same point. And now they run 'cool' at about 40C in-use and just above room temp in standby. Sound? Acoustically invisible. Confidence? Much better. Value for money?...Well, it works for me. You'll have to decide for yourself. Four and a half stars.
Review: BIG sound from small boxes - Beautiful little boxes with a BIG sound. I have upgraded the opamps to VirtualHifi Supersonic V1, 4 of them at €25 each, and the sound is amazing. Paired with a set of Wharfdale 12.3 I don’t need a sub (if you like normal music with normal bass levels). My go-to tracks for testing are Bruno Mars, Versace On the Floor, and Alfie Boe, Bring Him Home. Unbelievable bass control on the Bruno Mars track, deep and controlled, not boomy. For Alfie Boe, it sounds like you are there watching the performance live. Like all hifi reviews it is purely subjective and you should listen yourself to find out if it is right for you. The best thing about buying on desertcart is you can send it back if you don’t like it.

## 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.
- 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D31M3DXY |
| Best Sellers Rank | 12,146 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 47 in Hi-Fi Amplifiers |
| Brand | Fosi Audio |
| Country Of Origin | China |
| Customer Reviews | 4.4 out of 5 stars 371 Reviews |
| Included Components | 48V Power supply |
| Item Dimensions | 14.5 x 10.8 x 4 centimetres |
| Item Weight | 750 Grams |
| Item dimensions L x W x H | 14.5 x 10.8 x 4 centimetres |
| Manufacturer | Fosi Audio |
| Material | Metal |
| Maximum Supply Voltage | 48 Volts |
| Maximum supply voltage | 48 Volts |
| Minimum Supply Voltage | 32 Volts |
| Minimum supply voltage | 32 Volts |
| Model Number | V3 Mono |
| Mounting Type | Surface Mount |
| Mounting type | Surface Mount |
| Number of Channels | 1 |
| Operating Temperature | 23 Degrees Celsius |
| Output Power | 240 Watts |
| Package Type Name | cardboard box |
| Specification Met | CE |
| Supply Current | 5 Amps |
| Voltage | 230 Volts |

## Product Details

- **Item dimensions L x W x H:** 14.5 x 10.8 x 4 centimetres
- **Manufacturer:** Fosi Audio
- **Maximum supply voltage:** 48 Volts
- **Minimum supply voltage:** 32 Volts
- **Voltage:** 230 Volts

## Images

![Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs - Image 1](https://m.media-amazon.com/images/I/51UT2mXOVcL.jpg)

## Questions & Answers

**Q: No sound change after switching the gain switch?**
A: The gain switch on the V3 MONO only works with the RCA input. When using RCA mode, switching the gain setting will noticeably change the volume. (If it's already set to RCA mode, the output level from the preamp is usually sufficient.)

**Q: Would the noise still occur if no audio input cables are connected?**
A: Try replacing the audio source, using well-shielded audio cables, and switching to a different speaker.

**Q: Doesn't work in standby mode?**
A: Use a separate power supply and power strip for each V3 MONO to avoid ground-loop noise affecting the standby function; if the light dims but the unit doesn't automatically shut down, please try replacing high-quality RCA cables.

**Q: V3 MONO don't have volume control or knobs?**
A: Yes. V3 MONO is a pure power amplifier, it is recommended to use it with a DAC, preamplifier, or player with volume control.

**Q: What's the V3 MONO?**
A: V3 MONO is a mono channel amplifier. To achieve 2 channel amplifier effect, two V3 MONO are needed to connect two speakers.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good unit, but heat issues.
*by P***R on 17 March 2025*

Wasn't sure if these were going to be a 4 or 5 star review. As other commentators have said, they do run hot; burning hot, over 60C. They sit at 40C in standby. I worry about the heat affecting electrolytic capacitor lifespan. I bought four for my bi-amping project, (I was replacing my 4 channel 3886 hybrid 'scraplifier') and the quiescent current draw must have been enormous. So, on advice, I replaced the 48v psu (x4) with a 32v psu (x4). It added an extra hundred quid to the project, but I was eight hundred in to it by now, so it seemed rude not to. And, WOW, I'm still producing 100w (x4) into 8 ohms. And with a usb dac, everything reaches FSD (full volume) at the same point. And now they run 'cool' at about 40C in-use and just above room temp in standby. Sound? Acoustically invisible. Confidence? Much better. Value for money?...Well, it works for me. You'll have to decide for yourself. Four and a half stars.

### ⭐⭐⭐⭐⭐ BIG sound from small boxes
*by M***I on 10 January 2026*

Beautiful little boxes with a BIG sound. I have upgraded the opamps to VirtualHifi Supersonic V1, 4 of them at €25 each, and the sound is amazing. Paired with a set of Wharfdale 12.3 I don’t need a sub (if you like normal music with normal bass levels). My go-to tracks for testing are Bruno Mars, Versace On the Floor, and Alfie Boe, Bring Him Home. Unbelievable bass control on the Bruno Mars track, deep and controlled, not boomy. For Alfie Boe, it sounds like you are there watching the performance live. Like all hifi reviews it is purely subjective and you should listen yourself to find out if it is right for you. The best thing about buying on Amazon is you can send it back if you don’t like it.

### ⭐⭐⭐⭐⭐ Believe the hype, these Fosi v3 monoblocks are exceptional.
*by P***E on 11 October 2024*

I bought 4 of these Fosi v3 monoblocks with 2 x 48volt/10amp power supply units. They are being used to drive Tannoy XT8F revolution tower speakers in a vertical mono/bi-amp mode ( i.e. each speaker is connected to 2 monoblocks with a shared PSU ). After an initial 24 hour burn in, they opened up to produce a wonderfully transparent, dynamic and powerful sound. The treble is clean without edge or grain, the midrange is very clear with excellent low level detail resolution and the bass is well controlled, defined, extended and surprisingly hard hitting. The overall tonal balance is quite neutral with just a hint of treble forwardness. The Fosi v3 small form factor, belies its capability when producing a very large soundstage with terrific focus on, and the space between, the musical elements within it. Plus the stereo imagery is precise with good centre focus, coherence and decent depth. I was originally sceptical about the V3 mnbks when I heard, read and saw ( on You tube ) the rave reviews about them. Now I have confirmed for myself, their exceptional performance for the money. Compared to my 2 other, much more expensive power amps, from Marantz and Emotiva, they more than hold their own. Highly recommended. Additional information:- Everything said about the v3 monoblocks remains the same, ( if anything they're even better sounding than when they were first reviewed, due to slightly less treble forwardness ). However they do become hot during use. Therefore I recommend using a low noise fan ( if you can't put them on/in a well ventilated shelf/cabinet ). DON'T stack them on top of each other without adding feet to separate them.

## Frequently Bought Together

- Fosi Audio V3 Mono Power Amplifier for Home Audio Speakers, Mini Monoblock Class D Amp with TPA3255, 240W for HiFi Home Theater AVR Receiver Component, RCA/XLR Balanced Inputs 48V/5A Power
- Fosi Audio ZD3 Desktop DAC Preamp, Fully Balanced Digital to Analog Audio Converter with ES9039Q2M for Home Stereo Amplifier, Bluetooth/USB/Optical/Coax/TV HDMI ARC Input, XLR/RCA Output with Remote

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-23*