---
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: "VT93268"
currency: VUV
in_stock: true
reviews_count: 8
category: "Fosi Audio"
url: https://www.desertcart.vu/products/593574160-fosi-audio-za3-balanced-stereo-mono-amplifier-hifi-with-tpa3255
store_origin: VU
region: Vanuatu
---

# 235W max mono power Balanced XLR/TRS inputs Advanced heat dissipation 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:** VT93268
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your desktop audio game with power, precision, and pro-level polish.

## 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?** VT93268 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/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

- • **Dual-Mode Powerhouse:** Switch effortlessly between 180W stereo and a booming 235W mono output for ultimate audio flexibility.
- • **Seamless System Sync:** 12V trigger-in lets your entire setup power on/off in perfect harmony—no extra hassle.
- • **Custom Sound Sculpting:** Swap out op-amps to tailor your audio signature—unleash your inner sound engineer with ease.
- • **Pro-Grade Balanced Inputs:** XLR and 1/4" TRS combo inputs slash noise and interference for crystal-clear sound.
- • **Audiophile-Approved Components:** Premium TPA3255 chips and top-tier Japanese & German capacitors deliver pristine clarity and ultra-low distortion.

## Overview

The Fosi Audio ZA3 is a compact, high-performance Class-D amplifier featuring dual TPA3255 chips that deliver up to 180W in stereo or 235W in mono mode. Equipped with balanced XLR/TRS inputs and a 12V trigger for seamless integration, it boasts premium audiophile-grade components and advanced heat dissipation for stable, distortion-free sound. Its op-amp rolling capability allows personalized sound tuning, making it a versatile powerhouse for desktop and bookshelf passive speakers.

## Description

This compact amp delivers up to 180W stereo or 235W mono, with balanced XLR/TRS inputs and 12V trigger for seamless integration with your audio setup.

Review: Breakthrough products with balanced XLR inputs and dual amplifier chips. - So...in my opinion...this is were Class D now defeats Class A-B amplifiers. I have these with the ZD3 - running in mono. The installed NE5532 op amps in the ZA3's are ok but after doing research I found the best op amps that are inexpensive. The LM 4562 Op Amps...provide stunning clarity and resolution. Even without this modification..the ZA3 is a truly innovative product. The ZA3 has dual amplification chips...not a single unit. This provides the greater resolution and fidelity. The ZD3 already has these installed and the resolution is superb. Don't forget the ZA3 has balanced XLR inputs..which is class leading in terms of inputs. In such a small unit ! The sound is so refined and detailed. Buy yourself a power supply filter for your wall sockets and some ferrite cores and this further improves detail for any sound system. I did buy a second ZA3 - added the LM 4562's of which 3 are required for left - right & XLR input. 5 - if you have a subwoofer. The 12v trigger is so convenient...just by a good length 3.5 jack splitter cable to control both ZA3's with the remote. So I purchased the extra ZA3 and upgraded to mono. Each dual amp chip in each ZA3 - now controls one speaker - providing greater power and detail. I'd say it has boosted speaker detail and power delivery by 40%. What's interesting is that this isn't just about volume/gain...it increases depth and detail greatly. Is it necessary? No. Other amps in Class D - have only one amplifier chip and can't match the resolution of the ZA3. What's interesting...if you check vastly more expensive amps - check what op amps they are using. Very often it is the standard NE 5532's or OPA. The LM 4562 chips are sort of a hidden gem in op amps...fast and detailed and the fosi ZA3 is hardware compatible with their greater resolution and depth. It's only £10 for two chips...but make sure they are genuine. I have wharfdale 9.1 diamond speakers...and for the first time..I modded the crossover to film foil capacitors which I didn't think I would be capable of doing. Just takes a little time and I have never soldered before...but I gave it a go and it improved the quality of output greatly. The ZA3 is a power efficent and small device with just about everything you'd want for a high end audio system. I think it is a genius product that is vastly underrated. Even prestigious audiophiles are using the ZA3 in mono configuration.
Review: Amazing bit of kit especially used as mono blocks give the big names a run for their money - These are an amazing amp for the money. There’s plenty of reviews on YouTube comparing them to £7000 amps they are that good. Brilliant as a stereo amp and even better as a pair set in mono connected via xlr. Great paired up the pre amp ZD3 if you’ve using a streamer or CD player as source. Ignore the audiophile snobs and the lack of reviews on sites like what hi-fi that depend on pushing big names to fund their site. What’s even better is you can crack these amps open and swap out the opamp chips for even better performance. There’s so much power in these that you could easily power big 100w speakers as well as 30W book shelf speakers. Sleek and clean look small in size so two fit nicely side by side. Easy to connect put blistering performance for the money. Only sight negative if used in mono it lowers the subwoofer volume . So you may need to up the gain to compensate.

## 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 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 5,471 in Climate Pledge Friendly ( See Top 100 in Climate Pledge Friendly ) 17 in Hi-Fi Amplifiers 5,473 in Climate Pledge Friendly: Shop All |
| Colour | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (958) |
| Date First Available | 24 Oct. 2023 |
| Item Package Quantity | 1 |
| Item Weight | 1.2 kg |
| Item model number | ZA3 |
| Manufacturer | Fosi Audio |
| Material | Aluminium |
| Noise Level | 12 Decibels |
| Part number | ZA3 |
| Plug profile | Surface Mount |
| Product Dimensions | 15.49 x 18.39 x 5.08 cm; 1.2 kg |
| Specification met | FCC |
| Voltage | 48 Volts |
| Wattage | 235 watts |

## 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

### ⭐⭐⭐⭐⭐ Breakthrough products with balanced XLR inputs and dual amplifier chips.
*by A***R on 26 November 2024*

So...in my opinion...this is were Class D now defeats Class A-B amplifiers. I have these with the ZD3 - running in mono. The installed NE5532 op amps in the ZA3's are ok but after doing research I found the best op amps that are inexpensive. The LM 4562 Op Amps...provide stunning clarity and resolution. Even without this modification..the ZA3 is a truly innovative product. The ZA3 has dual amplification chips...not a single unit. This provides the greater resolution and fidelity. The ZD3 already has these installed and the resolution is superb. Don't forget the ZA3 has balanced XLR inputs..which is class leading in terms of inputs. In such a small unit ! The sound is so refined and detailed. Buy yourself a power supply filter for your wall sockets and some ferrite cores and this further improves detail for any sound system. I did buy a second ZA3 - added the LM 4562's of which 3 are required for left - right & XLR input. 5 - if you have a subwoofer. The 12v trigger is so convenient...just by a good length 3.5 jack splitter cable to control both ZA3's with the remote. So I purchased the extra ZA3 and upgraded to mono. Each dual amp chip in each ZA3 - now controls one speaker - providing greater power and detail. I'd say it has boosted speaker detail and power delivery by 40%. What's interesting is that this isn't just about volume/gain...it increases depth and detail greatly. Is it necessary? No. Other amps in Class D - have only one amplifier chip and can't match the resolution of the ZA3. What's interesting...if you check vastly more expensive amps - check what op amps they are using. Very often it is the standard NE 5532's or OPA. The LM 4562 chips are sort of a hidden gem in op amps...fast and detailed and the fosi ZA3 is hardware compatible with their greater resolution and depth. It's only £10 for two chips...but make sure they are genuine. I have wharfdale 9.1 diamond speakers...and for the first time..I modded the crossover to film foil capacitors which I didn't think I would be capable of doing. Just takes a little time and I have never soldered before...but I gave it a go and it improved the quality of output greatly. The ZA3 is a power efficent and small device with just about everything you'd want for a high end audio system. I think it is a genius product that is vastly underrated. Even prestigious audiophiles are using the ZA3 in mono configuration.

### ⭐⭐⭐⭐⭐ Amazing bit of kit especially used as mono blocks give the big names a run for their money
*by M***D on 11 November 2025*

These are an amazing amp for the money. There’s plenty of reviews on YouTube comparing them to £7000 amps they are that good. Brilliant as a stereo amp and even better as a pair set in mono connected via xlr. Great paired up the pre amp ZD3 if you’ve using a streamer or CD player as source. Ignore the audiophile snobs and the lack of reviews on sites like what hi-fi that depend on pushing big names to fund their site. What’s even better is you can crack these amps open and swap out the opamp chips for even better performance. There’s so much power in these that you could easily power big 100w speakers as well as 30W book shelf speakers. Sleek and clean look small in size so two fit nicely side by side. Easy to connect put blistering performance for the money. Only sight negative if used in mono it lowers the subwoofer volume . So you may need to up the gain to compensate.

### ⭐⭐⭐⭐⭐ 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.

## 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 Vanuatu*
*Store origin: VU*
*Last updated: 2026-02-13*