---
product_id: 593516480
title: "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: "₨115367"
currency: LKR
in_stock: true
reviews_count: 8
category: "Fosi Audio"
url: https://www.desertcart.lk/products/593516480-za3-balanced-stereo-amplifier-home-audio-component-mini-2-channel
store_origin: LK
region: Sri Lanka
---

# 235W max mono power Balanced XLR/TRS input Advanced heat dissipation 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:** ₨115367
**Availability:** ✅ In Stock

## Summary

> 🎧 Tiny Amp, Massive Impact: Power Your Sound Like a Pro

## Quick Answers

- **What is this?** 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?** ₨115367 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/593516480-za3-balanced-stereo-amplifier-home-audio-component-mini-2-channel)

## 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:** Upgraded chassis with side vents and dust covers ensures stable, high-power performance without overheating.
- • **Dual-Mode Powerhouse:** Switch effortlessly between 180W stereo and 235W mono modes for tailored audio dominance.
- • **Custom Sound Sculpting:** Swap op-amps to fine-tune your audio signature—personalize your listening like a true audio connoisseur.
- • **Pro-Grade Connectivity:** Balanced combo inputs (XLR & 1/4" TRS) slash noise and interference for crystal-clear sound.
- • **Audiophile-Approved Components:** Premium TPA3255 chip with Japanese & German capacitors deliver pristine clarity and 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 and 235W in mono mode. Featuring balanced XLR/TRS inputs and a 12V trigger for seamless integration, it uses premium audiophile-grade components for exceptional clarity and low noise. Its advanced heat dissipation design ensures reliable high-power output, while swappable op-amps let you customize your sound. Perfect for desktop setups, home theaters, and bookshelf speakers, the ZA3 combines professional-grade performance with sleek, space-saving design.

## 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 | #6,273 in Electronics ( See Top 100 in Electronics ) #18 in Audio Component Amplifiers |
| Brand Name | Fosi Audio |
| Customer Reviews | 4.6 out of 5 stars 998 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

![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!

### ⭐⭐⭐⭐⭐ Plenty of power, sounds nice, good support (firmware updates)
*by D***H on March 7, 2025*

Great little amp. My stack is a Wiim amp pro (for streaming and eq), Fosi ZD3 preamp, and Fosi ZA3 with the 48v power supply running in stereo mode. Mostly run from an apple tv sending hdmi to the tv then optical from there. The whole setup was easily under $500. I chose this setup in case I needed more power, I can simply add another amp and run mono, but it's definitely not needed. Runs a pair of Q Accoustic 5020s easily to unlistenable levels in a small/med size room (450sq/ft). I have the whole stack switched with a smart plug and haven't had any issues with powering off or on (unlike my last set of powered Swans speakers which blew up on power up). I was occasionally getting a little pop on power up and also a computerized "bzzzrt" very occasionally during listening. I just googled and found there was a firmware update for the Preamp (no issue with the amp). Just contact Fosi support and they give you the url for the updated firmware. Easy to install with a windows laptop and usb cord. Haven't had either issue since. Really nice to see firmware updates so quickly! So used to products this cheap being treated as "disposable" and not getting real support. I'm very happy with the performance and the support. I think it really helps that there seems to be a lot of love in the stereo community for this and other Fosi products. I hope it continues to get firmware updates in the future. The set looks really clean and very minimal. Used to do the whole rack or shelf system of components, but I'm over it. Most recently, I was using a set of powered speakers because I like not seeing the electronics. But when those failed you basically throw the whole thing away. I eventually had them fixed, but I don't like the idea of a failure being a total loss. So now I like having small separate pieces. I absolutely love the size. Even though the Fosi set looks very nice, I now have my entire multimedia set up hidden behind a small chest and subwoofer as shown in the last picture (please ignore my weird music choice). There is one downer on this product. It has a sub out which is great. But when you connect a subwoofer, it still sends full signal to the speaker outs. At high volumes you can hear the small bookshelf speakers trying to put out bass that's not really needed with a sub. Edit: I forgot my SVS subwoofer has a high pass eq! So now I have the preamp go into the subwoofer and pass through to the amp. The sub out should really be on the preamp not the amp. Weird choice.

## 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 Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-01*