---
product_id: 593574160
title: "Fosi Audio ZA3 Balanced Stereo/Mono Amplifier HiFi with TPA3255 Chips, Mini Audio Amp Monoblock with XLR RCA Inputs and 12V Trigger-in for Desktop Bookshelf Passive Speakers with 48V5A Power Supply"
brand: "fosi audio"
price: "R8591"
currency: ZAR
in_stock: true
reviews_count: 13
category: "Fosi Audio"
url: https://www.desertcart.co.za/products/593574160-fosi-audio-za3-balanced-stereo-mono-amplifier-hifi-with-tpa3255
store_origin: ZA
region: South Africa
---

# 235W max power output XLR + RCA + ¼” TRS balanced inputs Advanced heat dissipation system Fosi Audio ZA3 Balanced Stereo/Mono Amplifier HiFi with TPA3255 Chips, Mini Audio Amp Monoblock with XLR RCA Inputs and 12V Trigger-in for Desktop Bookshelf Passive Speakers with 48V5A Power Supply

**Brand:** fosi audio
**Price:** R8591
**Availability:** ✅ In Stock

## Summary

> 🎶 Power, Precision, and Prestige — Amplify Your Audio Game!

## Quick Answers

- **What is this?** Fosi Audio ZA3 Balanced Stereo/Mono Amplifier HiFi with TPA3255 Chips, Mini Audio Amp Monoblock with XLR RCA Inputs and 12V Trigger-in for Desktop Bookshelf Passive Speakers with 48V5A Power Supply by fosi audio
- **How much does it cost?** R8591 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/593574160-fosi-audio-za3-balanced-stereo-mono-amplifier-hifi-with-tpa3255)

## 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:** Enhanced chassis design with side vents and dust covers ensures stable, high-power performance without overheating.
- • **Dual-Mode Powerhouse:** Switch effortlessly between stereo (180W×2) and mono (235W) modes to match your audio ambitions.
- • **Seamless Connectivity:** Balanced XLR and 12V trigger-in enable noise-free input and synchronized power control across your setup.
- • **Custom Sound Sculpting:** Roll your own sonic signature with swappable op-amps—tailor your audio like a true connoisseur.
- • **Audiophile-Grade Clarity:** Experience pristine sound with TPA3255 Class-D chip and premium Japanese & German components for ultra-low distortion.

## Overview

The Fosi Audio ZA3 is a compact, high-performance Class-D amplifier delivering up to 235W in mono mode and 180W per channel in stereo. Featuring balanced XLR, RCA, and ¼” TRS inputs, it minimizes noise and supports 12V trigger synchronization for seamless integration. Built with premium components and advanced heat dissipation, the ZA3 offers audiophile-grade clarity and customizable sound via swappable op-amps, making it the perfect desktop or bookshelf amplifier for discerning millennials seeking both power and precision.

## 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. At Fosi Audio, behind every innovation Amplifying Your Voice, Shaping Our Innovation 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 180W*2 @4Ω; Mono 235W @4Ω(Output power depends on speaker impedance and power supply) Flawless XLR Balanced Input Support Delivers pure sound, initiating a high-definition auditory adventure with unmatched clarity. PBTL Mono Mode Support More power output to elevate your stereo HiFi system to new heights. TI TPA3255 Amp Chip Integrated Enabling superior sound and ultra-low distortion across the audio band with Class-D efficiency. 12V Trigger Sync Interface Smooth synchronization with other devices for easy one-click power management. One-Piece Molded Chassis Delicate sandblasting and smooth beveled edges, exuding a premium texture and high-end appeal. 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. Separated Digital & Analog Modules Optimized circuit board layout protects core audio modules from interference for a purer sound. Advanced Heat Dissipation Design Enhanced cooling with larger chassis, whole-body heatsink, and side ventilation with dust covers. FAQ Q: Not Working A: 1.Ensure all connections are properly inserted and long press the volume button for 2 seconds to power it on. 2.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. 3.If other devices have a 12V trigger output, check if it can trigger the ZA3. Q: One channel no sound or left/right imbalance A: ZA3 uses the Taper A pot, the output voltage increases logarithmically. Hence, when adjusting the volume below 60%, you might perceive a smaller change in volume. However, beyond 60%, the volume increase becomes more pronounced. Therefore, if you require a louder volume, simply adjust the knob above 80%. Please try increasing the volume of the source or upgrade to a higher power supply to achieve more power output. Q: How Many Op-Amps Should I Change in ZA3? Stereo Mode: Replacing the op-amps for both left and right channels in stereo mode, regardless of RCA or XLR inputs, will notably enhance sound quality. Mono Mode: Only replace the op-amps for the right channel. XLR Input: Using XLR input mode allows for further sound quality enhancement by replacing the op-amps for the XLR channel. Subwoofer Channel: If a subwoofer is connected, there's the option to replace the op-amps responsible for the subwoofer channel. Note: Carefully align the notch/the number '1' on the chip's cover with the 'O1' mark on the PCB. Comparison Chart ZA3 Type 2.0 CH Amp Rated Power Output 180W x 2 / 235W x 1 Input RCA+XLR+¼”TRS Output Passive SPK +Sub-out Treble& Bass Control THD <0.006% SNR ≥106dB Learn More ZA3 Type 2.0 CH Amp Rated Power Output 180W x 2 / 235W x 1 Input RCA+XLR+¼”TRS Output Passive SPK +Sub-out Treble& Bass Control THD <0.006% SNR ≥106dB V3 Type 2.0 CH Amp Rated Power Output 230W x 2 Input RCA Output Passive SPK +Pre-out Treble& Bass Control THD <0.003% SNR ≥110dB Learn More V3 230W x 2 RCA Passive SPK +Pre-out <0.003% ≥110dB V3 MONO Type Monoblock Amp Rated Power Output 240W x 1 Input RCA+XLR (¼”TRS) Output Passive Speaker Treble& Bass Control THD <0.006% SNR ≥123dB Learn More V3 MONO Monoblock Amp 240W x 1 RCA+XLR (¼”TRS) Passive Speaker ≥123dB BT20A PRO Type Bluetooth 2.0 CH Amp Rated Power Output 220W x 2 Input Bluetooth + RCA Output Passive Spk+Pre-out Treble& Bass Control THD ≤ 0.03% SNR ≥ 108dB Learn More BT20A PRO Bluetooth 2.0 CH Amp 220W x 2 Bluetooth + RCA Passive Spk+Pre-out ≤ 0.03% ≥ 108dB TB10D Type 2.0 CH Amp Rated Power Output 230W x 2 Input RCA Output Passive Speakers Treble& Bass Control THD ≤ 0.3% SNR ≥ 90dB Learn More TB10D Passive Speakers ≤ 0.3% ≥ 90dB

Review: Super good small amp! - Excellent amp! Lots of power! Greeat sound quality! I love the styling, and even like the volume button being the on off switch, it makes a lovely noise when you turn it off lol... Mine came with a 48v 5a psu, couldnt be happier with this purchase, seems great value!
Review: A Great Amplifier that can extend your Hi-Fi hobby - After much thought, I purchased two of these Amps to work in conjunction with the Fosi DAC ZD3 that I had previously purchased. I have both Amps set up in Mono to the DAC. The DAC does the channel separation. I have not lived with the system for very long, but initial impressions are that these are incredibly good amplifiers that really punch out good clear sound. They are also now possibly exposing the weakness of my speakers, but that could also be just another head rouse to purchase a different set of speakers. I like the fact that I can later play around with Op Amps, and that will take my Hi-Fi hobby into another dimension. I did have a little trouble setting up the triggers to both Amps, but that was easily overcome by purchasing a 3.5mm male jack headphone splitter that goes into two 3.5mm female ends. I have then added two short 3.5mm male to male cables to go from the DAC (now doubled) trigger to the amps. It works perfectly and the trigger does not seem to mind a double (stereo) 3.5mm lead for it to work. CEC works brilliantly on the DAC, so I can now turn on the whole set up from my smart television. The television is hooked up to the DAC via eArc HDMI, so a digital signal is received at the Fosi DAC, which is in turn doing all the heavy lifting to convert sound to an analogue signal, which it passes to the Amps. The Amps are turned on by the 12v triggers rather than the CEC signal.

## Features

- Dual-Mode Innovation: This new generation mini amplifier offers both stereo and mono modes, adapts flexibly to your diverse needs, allowing seamless mode switching. In stereo mode, it delivers a robust output of up to 180W@4Ω, while in mono mode, the power soars to a maximum of 235W@4Ω. Pair two ZA3 units in mono configuration to create a powerful audio system, significantly enhancing your listening experience. (The output power varies when connecting speakers with different impedances; please refer to the actual specifications.)
- Richer Connectivity: Debut amplifier with balanced input and trigger in, the ZA3 features a balanced combo audio signal input connector supporting both XLR and 1/4" TRS plugs. This design minimizes interference and reduces noise floor. The 12V trigger-in connector enables synchronization with other devices, streamlining the process of turning on/off without individual operations.
- Audiophile-Grade Components: The ZA3 features the TPA3255 high-end Class-D amp chip and utilizes premium Japanese NCC, ELNA, and German WIMA capacitors, and Japanese Sumida inductors for exceptional audio quality. With a SINAD rating of up to 89dB, an SNR of up to 106dB, and a low noise floor of only 150μV, it delivers exceptional clarity and low distortion.
- Advanced Heat Dissipation: Based on V3's groundbreaking heat dissipation design, we upgraded ZA3's cooling system by featuring a larger chassis, moving vents to the sides, and adding dust covers to achieve better ventilation for a sustained and stable high power output.
- Enhanced Scalable Fun: Personalize your audio experience with the op-amp rolling feature! The ZA3 stocks five swappable op-amps for left and right channel outputs, balanced input, and subwoofer output. Experiment with compatible DIP8 dual op-amps such as Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4558, LM4562, LME49720HA, etc. to fine-tune your sound to perfection.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CLP4T5L7 |
| Best Sellers Rank | 6,585 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 9 in Hi-Fi Amplifiers |
| Brand | Fosi Audio |
| Country Of Origin | China |
| Customer Reviews | 4.5 out of 5 stars 1,280 Reviews |
| Item Dimensions | 15.5 x 18.4 x 5.1 centimetres |
| Item dimensions L x W x H | 15.5 x 18.4 x 5.1 centimetres |
| Manufacturer | Fosi Audio |
| Manufacturer Part Number | ZA3 |
| Material | metal |
| Maximum Output Power | 235W |
| Maximum Supply Voltage | 48 Volts (DC) |
| Maximum supply voltage | 48 Volts (DC) |
| Minimum Supply Voltage | 230 Volts |
| Minimum supply voltage | 230 Volts |
| Model Number | ZA3 |
| Mounting Type | Surface Mount |
| Mounting type | Surface Mount |
| Number of Channels | 2 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Output Power | 235 Watts |
| Package Type Name | Cardboard |
| Product Warranty | 2 years |
| Specification Met | RoHS |
| Supply Current | 230 Milliamps |
| Unit Count | 1.0 count |
| Voltage | 48 Volts |

## Product Details

- **Item dimensions L x W x H:** 15.5 x 18.4 x 5.1 centimetres
- **Manufacturer:** Fosi Audio
- **Maximum supply voltage:** 48 Volts (DC)
- **Minimum supply voltage:** 230 Volts
- **Voltage:** 48 Volts

## Images

![Fosi Audio ZA3 Balanced Stereo/Mono Amplifier HiFi with TPA3255 Chips, Mini Audio Amp Monoblock with XLR RCA Inputs and 12V Trigger-in for Desktop Bookshelf Passive Speakers with 48V5A Power Supply - Image 1](https://m.media-amazon.com/images/I/51XgZUlMEQL.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

### ⭐⭐⭐⭐⭐ Super good small amp!
*by D***Y on 11 July 2026*

Excellent amp! Lots of power! Greeat sound quality! I love the styling, and even like the volume button being the on off switch, it makes a lovely noise when you turn it off lol... Mine came with a 48v 5a psu, couldnt be happier with this purchase, seems great value!

### ⭐⭐⭐⭐⭐ A Great Amplifier that can extend your Hi-Fi hobby
*by M***T on 13 August 2025*

After much thought, I purchased two of these Amps to work in conjunction with the Fosi DAC ZD3 that I had previously purchased. I have both Amps set up in Mono to the DAC. The DAC does the channel separation. I have not lived with the system for very long, but initial impressions are that these are incredibly good amplifiers that really punch out good clear sound. They are also now possibly exposing the weakness of my speakers, but that could also be just another head rouse to purchase a different set of speakers. I like the fact that I can later play around with Op Amps, and that will take my Hi-Fi hobby into another dimension. I did have a little trouble setting up the triggers to both Amps, but that was easily overcome by purchasing a 3.5mm male jack headphone splitter that goes into two 3.5mm female ends. I have then added two short 3.5mm male to male cables to go from the DAC (now doubled) trigger to the amps. It works perfectly and the trigger does not seem to mind a double (stereo) 3.5mm lead for it to work. CEC works brilliantly on the DAC, so I can now turn on the whole set up from my smart television. The television is hooked up to the DAC via eArc HDMI, so a digital signal is received at the Fosi DAC, which is in turn doing all the heavy lifting to convert sound to an analogue signal, which it passes to the Amps. The Amps are turned on by the 12v triggers rather than the CEC signal.

### ⭐⭐⭐⭐⭐ Excellent, powerful, clear
*by I***E on 23 June 2026*

Very smart little device which I combined with a Fosi pre-amp. Surprisingly powerful with good quality sound. Looks v cool.

## 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 South Africa*
*Store origin: ZA*
*Last updated: 2026-08-17*