---
product_id: 588475459
title: "- Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply"
brand: "fosi audio"
price: "S$293"
currency: SGD
in_stock: true
reviews_count: 8
category: "Fosi Audio"
url: https://www.desertcart.sg/products/588475459-fosi-audio-za3-balanced-stereo-amplifier-home-audio-component-mini
store_origin: SG
region: Singapore
---

# 155W stereo output 235W mono output Balanced input support - Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply

**Brand:** fosi audio
**Price:** S$293
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate Your Sound Game with the Fosi Audio ZA3!

## Quick Answers

- **What is this?** - Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply by fosi audio
- **How much does it cost?** S$293 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/588475459-fosi-audio-za3-balanced-stereo-amplifier-home-audio-component-mini)

## 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

- • **Dual-Mode Flexibility:** Switch seamlessly between stereo and mono modes for tailored audio experiences.
- • **Enhanced Connectivity:** Balanced input minimizes interference, while 12V trigger-in simplifies device synchronization.
- • **Advanced Heat Management:** Innovative cooling design ensures sustained high power output without overheating.
- • **Personalized Sound Tuning:** Experiment with swappable op-amps to customize your audio output to perfection.
- • **Audiophile-Grade Components:** Experience superior sound quality with high-end Class-D amp chip and premium capacitors.

## Overview

The Fosi Audio ZA3 is a versatile mini amplifier designed for audiophiles, offering both stereo and mono modes with powerful outputs of up to 155W and 235W respectively. It features high-quality components for exceptional audio clarity, advanced heat dissipation for reliable performance, and flexible connectivity options, making it an ideal choice for enhancing your home audio experience.

## Description

Product Description Fosi Audio ZA3 The next generation balanced dual-mode Class-D power amplifier. Fosi Audio's first amplifier supporting both stereo and mono modes. Amplifying Your Voice, Shaping Our Innovation At Fosi Audio, behind every innovation, there's a story. The birth of the ZA3 amplifier is just such a story, centered around our users. After the launch of the V3 amplifier, we gathered innumerable feedback from passionate audiophiles. They expressed a desire for us to develop an even better amplifier based on V3. Input: RCA, XLR, ¼”TRS; Output: Stereo, Mono SNR≥106dB; THD<0.006%; SINAD: 89dB Frequency Response: 20Hz-20kHz (±0.1dB) Rated Power Output: Stereo 155W*2 @4Ω; Mono 235W @4Ω TI TPA3255 Amp Chip Integrated Enabling superior sound and ultra-low distortion across the audio band with Class-D efficiency. Advanced Heat Dissipation Design Enhanced cooling with larger chassis, whole-body heatsink, and side ventilation with dust covers. Swappable Op-Amps Compatible with DIP8 dual op-amps. Roll them to get your preferred sound signature. Logarithmic Potentiometer Helps to achieve a fine volume tuning to match human ear's auditory characteristics. 12V Trigger Sync Interface Smooth synchronization with other devices for easy one-click power management, unifying your audio system's operation. Aluminum Alloy and One-Piece Molded Chassis Delicate sandblasting and smooth beveled edges, exuding a premium, exquisite texture and high-end appeal. Frequently Asked Questions 1. Why is there no sound after all the devices areconnected?The amplifier is not powered on, please check whetherthe mode indicator is on:The volume of the amplifier is too small, please turnthe volume knob clockwise and adjust it to the rightlevel;The audio cable is connected ineorreot'Yp eaee ctionreconnectit according to the steps inmanual:The audio source is not playing or muted, please checkthe audio source equipment. 2. After a successful connection, the sound is abnormal?Polarity reversed. Please check if the speaker wires arecorrectly connected with the red as positive and blackas negative;Boer epeake. wFce REAVRCRReconnect or replace thecables,reestaplish theconnections or try using different RCA/XLR cables.Amplifier overload. Reduce the volume if the amplifierIs experiencing overload. 3. Unable to play properly after connecting the turntable?The turntable lacks a built-in preamp: Pleasecheck ifyour turntable has a built-in preamp. The ZA3does nothave a built-in turntable preamp, so you needto connectan external turntable preamp between your turntable and the ZA3, For example,Fosi Audio Boxx1,X2, X4,Incorrect turntable output mode: Turntables with builtIn preamps typically offerboth turntable output andline output options. Please select the line output.

Review: changed my opinion about class D amps! - where to begin! My previous setup was Marantz PM6007 with WiiM Ultra & Elipson Planet L Speakers. I was ok with the setup but I knew, was missing something on the higher frequencies & details. just heard about this product on youtube channel "VirtualHiFi" - found many good videos with sound test comparing with 10k - 15k USD costing amps. I took the decision & bought this today with 48V power supply & right now its been playing for 3 hours replacing the marantz PM6007 only with rest of the same setup. I have no words to say - Man! it's blown away the marantz right out of the box and my elipson planet L speakers have come to life. it's a night & day difference. I kept the volume at 75% position & controlling the volume from wiim ultra and it's running cooler now than at 100% position. i am seriously thinking about the reason why it is sounding great than the marantz. Hmm.. may be one reason - the frequency range with 0.1+-DB? I don't know but it's sounding fuller, detailed, airy high-frequencies & analogue kind of texture. ZA3 changed my mind to join in the class D era as I have ordered another now to try as Monoblocks. I am totally happy & the value for money is top of the roof! I really appreciate the FOSI TEAM behind this to design such a great product! Best of luck for your next musical invention!!! Got the second one & set them as monoblocks - sound stage is wider now & details are more cleaner especially the vocals & mid range. I started enjoying my setup now with peace of mind!
Review: Best option for medium size room - Excellent Sound Quality and compact size with good thermal management. Blindly can go for it. Im using it in 5.2 home theater system.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CLP4T5L7 |
| Best Sellers Rank | #32,406 in Electronics ( See Top 100 in Electronics ) #32 in Hi-Fi Amplifiers |
| Brand Name | Fosi Audio |
| Customer Reviews | 4.5 out of 5 stars 1,043 Reviews |
| Importer Contact Information | support@fosiaudio.com. |
| Item Dimensions | 15.5 x 18.4 x 5.1 Centimeters |
| Item Weight | 1.2 Kilograms |
| Item dimensions L x W x H | 15.5 x 18.4 x 5.1 Centimeters |
| Manufacturer | Fosi Audio |
| Maximum Supply Voltage | 48 Volts |
| Minimum Supply Voltage | 48 Volts |
| Model Number | ZA3 |
| Mounting Type | Surface Mount |
| Number of Channels | 2 |
| Output Power | 545 Watts |
| Packer Contact Information | support@fosiaudio.com. |
| Specification Met | RoHS |
| Voltage | 48 Volts |

## Product Details

- **Item dimensions L x W x H:** 15.5 x 18.4 x 5.1 Centimeters
- **Manufacturer:** Fosi Audio
- **Maximum Supply Voltage:** 48 Volts
- **Minimum Supply Voltage:** 48 Volts
- **Voltage:** 48 Volts

## Images

![- Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply - Image 1](https://m.media-amazon.com/images/I/51XgZUlMEQL.jpg)
![- Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply - Image 2](https://m.media-amazon.com/images/I/71jrN7xxR1L.jpg)
![- Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply - Image 3](https://m.media-amazon.com/images/I/713BlqtwMhL.jpg)
![- Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply - Image 4](https://m.media-amazon.com/images/I/714J9YgFoiL.jpg)
![- Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply - Image 5](https://m.media-amazon.com/images/I/71SJfec1-vL.jpg)

## Questions & Answers

**Q: Is it possible to use the trigger out from the Fosi Audio ZD3 to two pieces of ZA3 amplifiers?**
A: Yes, use a dual 3.5mm male splitter cable to trigger the ZA3 to switch on synchronously.

**Q: How to set up a system using two ZA3 units in mono mode?**
A: - Connect the RCA (XLR) cables to the right-channel RCA (XLR) input ports of the two ZA3 units, and link the speaker wires to the right-channel binding posts.

**Q: ZA3 recommendations for replacing op-amps in mono mode?**
A: If you're using RCA mode, please replace only the right op-amp. For XLR mode, swap the right and XLR channel op-amps.

**Q: No front light on ZA3 though there is light on the ac adapter.**
A: Long press the volume button for 2 seconds to power it on.

**Q: The power on LED light on my ZA3 is dead.**
A: Check if the LED is misaligned with the front panel hole, especially if the op-amp was recently changed. Misalignment could cause the LED not to be visible through the case.

## Customer Reviews

### ⭐⭐⭐⭐⭐ changed my opinion about class D amps!
*by A***R on 25 August 2025*

where to begin! My previous setup was Marantz PM6007 with WiiM Ultra & Elipson Planet L Speakers. I was ok with the setup but I knew, was missing something on the higher frequencies & details. just heard about this product on youtube channel "VirtualHiFi" - found many good videos with sound test comparing with 10k - 15k USD costing amps. I took the decision & bought this today with 48V power supply & right now its been playing for 3 hours replacing the marantz PM6007 only with rest of the same setup. I have no words to say - Man! it's blown away the marantz right out of the box and my elipson planet L speakers have come to life. it's a night & day difference. I kept the volume at 75% position & controlling the volume from wiim ultra and it's running cooler now than at 100% position. i am seriously thinking about the reason why it is sounding great than the marantz. Hmm.. may be one reason - the frequency range with 0.1+-DB? I don't know but it's sounding fuller, detailed, airy high-frequencies & analogue kind of texture. ZA3 changed my mind to join in the class D era as I have ordered another now to try as Monoblocks. I am totally happy & the value for money is top of the roof! I really appreciate the FOSI TEAM behind this to design such a great product! Best of luck for your next musical invention!!! Got the second one & set them as monoblocks - sound stage is wider now & details are more cleaner especially the vocals & mid range. I started enjoying my setup now with peace of mind!

### ⭐⭐⭐⭐⭐ Best option for medium size room
*by P***U on 13 February 2026*

Excellent Sound Quality and compact size with good thermal management. Blindly can go for it. Im using it in 5.2 home theater system.

### ⭐⭐⭐⭐⭐ Value for money preamplifier
*by R***N on 19 February 2026*

Good preamplifier

## Frequently Bought Together

- Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio Component Mini 2 Channel Mono Amp TPA3255 for Subwoofer Desktop Home Theater Bookshelf Tower Floorstanding Passive Speakers with 48V Power Supply
- VANDESAIL XLR Cables, 3ft 2 Pack Microphone Cable, XLR Male to Female Balanced Microphone Cord 3 pin, 3 Foot Short mic Cord Oxygen-Free Copper (OFC) Nylon Braided

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-03-19*