---
product_id: 593516480
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: "$U15570"
currency: UYU
in_stock: true
reviews_count: 8
category: "Fosi Audio"
url: https://www.desertcart.uy/products/593516480-fosi-audio-za3-balanced-stereo-amplifier-home-audio-component-mini
store_origin: UY
region: Uruguay
---

# 180W stereo / 235W mono power Balanced XLR & 1/4" TRS inputs Advanced heat dissipation system 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:** $U15570
**Availability:** ✅ In Stock

## Summary

> 🎶 Tiny Amp, Massive Impact — Power Your Sound Like a Pro!

## 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?** $U15570 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/593516480-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

- • **Cool Under Pressure:** Enhanced ventilation and dust covers keep your amp running stable during marathon listening sessions.
- • **Dual-Mode Powerhouse:** Switch effortlessly between 180W stereo and a booming 235W mono mode for ultimate audio flexibility.
- • **Custom Sound Sculpting:** Swap op-amps to tailor your audio signature—because your sound should be as unique as you are.
- • **Pro-Grade Connectivity:** Balanced XLR and 1/4" TRS inputs slash noise and interference for crystal-clear sound.
- • **Audiophile-Approved Components:** Premium Japanese and German parts deliver pristine clarity with ultra-low distortion.

## Overview

The Fosi Audio ZA3 is a compact yet powerful Class-D stereo amplifier delivering up to 180W per channel in stereo mode and 235W in mono. Featuring balanced XLR and 1/4" TRS inputs, advanced heat dissipation, and premium audiophile-grade components, it ensures clean, distortion-free sound. Its innovative op-amp rolling capability lets you customize your audio experience, making it perfect for desktop setups, home theaters, and bookshelf speakers. With a sleek design and 48V power supply, the ZA3 combines professional-grade performance with user-friendly versatility.

## Description

Buy 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: Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Very satisfied but watch out for setup traps - I was replacing an older NAD integrated amp that I really liked. Decided to go class D amp for a replacement. WAY smaller. MUCH less expensive, and this unit has all the functionalities I was looking for at an incredible price (I bought mine for about $130 each on desertcart. Will be using two in mono mode. At first I thought they were defective. PAY ATTENTION TO THE MANUAL THAT WARNS YOU TO CONNECT ALL CABLING BEFORE YOU INSERT THE POWER CONNECTION. If you power the device first, then attach cables, it won't work at all until you detach the power cable and reinsert it. This is no fluke. It happened several times. Attach ALL cabling first, then insert the power connection. Secondly, if you're running it in mono mode the inputs for both units are inserted into the RIGHT side on the rear of the unit. The left channel is disabled in mono mode. This is all spelled out in the manual but it's counter-intuitive at first. As for sound, I'm pleased. I'm sending Tidal or Spotify digital signals to a Fosi ZD3 via bluetooth (works perfectly). The ZD3 is the DAC and connects to the paired Za3s. My speakers are very modest, a HSU powered sub that I've connected to the ZD3 (not the ZA3). Main speakers are HSU HB1 mk2. The ease of use with my iPhone is just fantastic. Essentially any song I want is at my fingertips. Sound quality is very good to my untrained ears. I'm very happy with this purchase. These amps have more than enough power to drive these smaller speakers even at higher volumes than I'd ever naturally want. The fit and finish of the amps is very good. No noise in the volume knob at all but I leave them in a fixed position adjusting volume either at the ZD3 "preamp" or even more commonly with my iPhone volume controls. I've been buying / building stereo equipment for about 55 years. I'm a huge music fan, but I can't hear all the mumbo-jumbo the experts can. I just know these are great little amps for an incredible price, and even one would work nicely in stereo mode. Very happy. Will see how they stand up to time and use.
Review: Tiny but Mighty! Simply Awesome. BUY IT! - Tiny but Mighty! Simply Awesome. Incredible value for money. Performance, quality, power, clarity, resolution, size, look, ease of installation (hint: there is none; plug it in and go!) - all great! Using it for my desktop amp; sounds way better than my powered JBL studio monitors. They're so inexpensive, I think I will add another one, and make mono blocks of them. I first saw/heard about these from cheapaudioman on YouTube. For the price, I had to try it, and I'm glad I did. They drive everything I've thrown on them - including 4 ohm speakers. It's phenomenal; sounds really good! 180 watts per channel (will be 230 watts/channel in mono mode!) and it's the size of my Mac Mini. Crazy good. Hat tip to cheapaudioman - you were dead on, a great recommendation!

## 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, while in mono mode, the power soars to a maximum of 235W. Pair two ZA3 units in mono configuration to create a powerful audio system, significantly enhancing your listening experience
- 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 | #6,489 in Electronics ( See Top 100 in Electronics ) #16 in Audio Component Amplifiers |
| Brand Name | Fosi Audio |
| Customer Reviews | 4.6 out of 5 stars 1,053 Reviews |
| Included Components | Fosi Audio ZA3 Power Amplifier x1；48V5A Power Adapter x1；User Manual x1 |
| Item Dimensions | 6.1 x 7.24 x 2 inches |
| Item Weight | 1.2 Kilograms |
| Item dimensions L x W x H | 6.1 x 7.24 x 2 inches |
| Manufacturer | Fosi Audio |
| Maximum Supply Voltage | 48 Volts (DC) |
| Minimum Supply Voltage | 24 Volts (DC) |
| Model | ZA3 |
| Mounting Type | Surface Mount |
| Number of Channels | 2 |
| Output Power | 235 Watts |
| Package Type Name | Cardboard Box |
| Specification Met | FCC |
| Voltage | 48 Volts |
| Warranty Description | 24-month manufacturer |

## Product Details

- **Item dimensions L x W x H:** 6.1 x 7.24 x 2 inches
- **Manufacturer:** Fosi Audio
- **Maximum Supply Voltage:** 48 Volts (DC)
- **Minimum Supply Voltage:** 24 Volts (DC)
- **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)

## 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

### ⭐⭐⭐⭐⭐ Very satisfied but watch out for setup traps
*by N***O on July 12, 2025*

I was replacing an older NAD integrated amp that I really liked. Decided to go class D amp for a replacement. WAY smaller. MUCH less expensive, and this unit has all the functionalities I was looking for at an incredible price (I bought mine for about $130 each on Amazon. Will be using two in mono mode. At first I thought they were defective. PAY ATTENTION TO THE MANUAL THAT WARNS YOU TO CONNECT ALL CABLING BEFORE YOU INSERT THE POWER CONNECTION. If you power the device first, then attach cables, it won't work at all until you detach the power cable and reinsert it. This is no fluke. It happened several times. Attach ALL cabling first, then insert the power connection. Secondly, if you're running it in mono mode the inputs for both units are inserted into the RIGHT side on the rear of the unit. The left channel is disabled in mono mode. This is all spelled out in the manual but it's counter-intuitive at first. As for sound, I'm pleased. I'm sending Tidal or Spotify digital signals to a Fosi ZD3 via bluetooth (works perfectly). The ZD3 is the DAC and connects to the paired Za3s. My speakers are very modest, a HSU powered sub that I've connected to the ZD3 (not the ZA3). Main speakers are HSU HB1 mk2. The ease of use with my iPhone is just fantastic. Essentially any song I want is at my fingertips. Sound quality is very good to my untrained ears. I'm very happy with this purchase. These amps have more than enough power to drive these smaller speakers even at higher volumes than I'd ever naturally want. The fit and finish of the amps is very good. No noise in the volume knob at all but I leave them in a fixed position adjusting volume either at the ZD3 "preamp" or even more commonly with my iPhone volume controls. I've been buying / building stereo equipment for about 55 years. I'm a huge music fan, but I can't hear all the mumbo-jumbo the experts can. I just know these are great little amps for an incredible price, and even one would work nicely in stereo mode. Very happy. Will see how they stand up to time and use.

### ⭐⭐⭐⭐⭐ Tiny but Mighty! Simply Awesome. BUY IT!
*by V***N on May 2, 2025*

Tiny but Mighty! Simply Awesome. Incredible value for money. Performance, quality, power, clarity, resolution, size, look, ease of installation (hint: there is none; plug it in and go!) - all great! Using it for my desktop amp; sounds way better than my powered JBL studio monitors. They're so inexpensive, I think I will add another one, and make mono blocks of them. I first saw/heard about these from cheapaudioman on YouTube. For the price, I had to try it, and I'm glad I did. They drive everything I've thrown on them - including 4 ohm speakers. It's phenomenal; sounds really good! 180 watts per channel (will be 230 watts/channel in mono mode!) and it's the size of my Mac Mini. Crazy good. Hat tip to cheapaudioman - you were dead on, a great recommendation!

### ⭐⭐⭐⭐⭐ Awesome product!
*by S***O on January 30, 2026*

These things are awesome. I love high quality audio and have expensive gear. I recently had a Amp go out on me, and through discussion with several people wh I consider Audiophiles - with the money to support the habit 😂, they kept pointing me to these. My plan was to buy 2of these, run them as mono blocks until my main Amp was repaired (6+ months - if you are into vintage gear you would understand the wait). Anyway -I purchased these and haven't looked back. Supreme sound quality for the money. I am running 2 as mononlockas and they pump out clean power. They don't sound sterile and have really brought the sound stage to life. I am using a WiiM Pro as my streamer then going through a Yamaha head unit for DAC. I cannot explain how something so reasonably priced outperforms gear that costs Thousands more!!! I wish this stuff would have been around when I was younger, I would have saved so much money. 1 last note - you can change te OPAmps on these to change the sound characteristics. A friend did this and they sound even better. Not the opamps he purchased cost almost as much as the amps themselves. Great cost to performance product! Fosi will always be on my list when buying gear in the future.

## 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 Uruguay*
*Store origin: UY*
*Last updated: 2026-03-10*