---
product_id: 670785387
title: "ZK-AS21 TPA3255 Bluetooth 5.1 Power Amplifier Board HiFi 2.1 Channel 220Wx2+350W Digital Audio Receiver AMP Board with Treble and Bass Control for DIY Speakers"
brand: "hosyond"
price: "€ 51.60"
currency: EUR
in_stock: true
reviews_count: 9
category: "Hosyond"
url: https://www.desertcart.ie/products/670785387-zk-as21-tpa3255-bluetooth-5-1-power-amplifier-board-hifi
store_origin: IE
region: Ireland
---

# Bluetooth 5.1 stable range 220W x2 stereo power Multi-layer safety protection ZK-AS21 TPA3255 Bluetooth 5.1 Power Amplifier Board HiFi 2.1 Channel 220Wx2+350W Digital Audio Receiver AMP Board with Treble and Bass Control for DIY Speakers

**Brand:** hosyond
**Price:** € 51.60
**Availability:** ✅ In Stock

## Summary

> 🎶 Power your sound, own the vibe — amplify your space with ZK-AS21!

## Quick Answers

- **What is this?** ZK-AS21 TPA3255 Bluetooth 5.1 Power Amplifier Board HiFi 2.1 Channel 220Wx2+350W Digital Audio Receiver AMP Board with Treble and Bass Control for DIY Speakers by hosyond
- **How much does it cost?** € 51.60 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/670785387-zk-as21-tpa3255-bluetooth-5-1-power-amplifier-board-hifi)

## Best For

- hosyond enthusiasts

## Why This Product

- Trusted hosyond brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Robust Safety & Reliability:** Built-in protections guard against short circuits, overheating, and overcurrent for worry-free use.
- • **App-Controlled Audio Mastery:** Customize sound, playlists, and settings effortlessly via intuitive app control and phone gestures.
- • **Immersive 2.1 Channel Powerhouse:** Delivers crisp 220W per channel plus a booming 350W subwoofer output for true HiFi sound.
- • **Next-Gen Bluetooth 5.1 Connectivity:** Experience seamless wireless streaming with up to 15m range and ultra-low latency.
- • **Pro-Grade Texas Instruments TPA3255 Chips:** Class D efficiency with ultra-low distortion ensures studio-quality audio clarity.

## Overview

The ZK-AS21 is a compact yet powerful 2.1 channel Bluetooth 5.1 amplifier board featuring dual 220W stereo channels and a 350W subwoofer output. Equipped with Texas Instruments TPA3255 Class D chips, it delivers high-fidelity sound with ultra-low distortion. Its versatile inputs (Bluetooth, AUX, USB) and app control offer seamless customization and wireless convenience. Designed for durability, it includes comprehensive safety protections and supports a wide range of speaker impedances, making it ideal for DIY audio enthusiasts seeking professional-grade performance.

## Description

Name: 2.1 channel BT power amplifier Channel: 2.1 channel (left channel+ right channel+subwoofer) BT Version: 5.1 Model:ZK-AS21 Audio input: BT+AUX+USB+USB sound card(dial wheel key to switch mode and song) Chip Solution:TPA3255 Adaptive power supply: DC16~38V, ≥10A Output power: R&L channel≤220W subwoofer≤350W Voltage gain:30dB Size:141*132*26mm Adaptive speaker: L&R channels30-220W,3-8Ω subwoofer 30-350W, 2-8Ω Protection Mechanism: Protection against reverse connec- tion,undervoltage,overheating, overcurrent and short circuit (automatic recovery without restart) KIND TIPS： When the audio signal input is large enough and the power supply voltage/current is large enough, there will be enough output power! The higher the power supply voltage, the greater the output power, and the smaller the speaker impedance, the greater the output power! Please make sure that the power of the adapted power supply is greater than the actual working power of the power amplifier! Packing Include: ZK-AS21 Power Amplifier Board * 1 Protective Shell * 1 Set Screwdriver * 1 Knob * 5

Review: Pros and Cons - Amazing, powerful little amplifier. The app isn't the best, but considering it's $30, it's pretty good. It's able to power a subwoofer, 2 tweeters, and 2 midranges with no problem. Its built in cooling fan keeps it ice cold, so there's no need to worry about overheating. Its size is also very compact, making it easy to take with you. Its bluetooth is amazing, with absolutely zero noise whatsoever, compared to its little brother ZK-MT21. Now, onto the CONS: 1. For some reason, the AUX input is delayed, and it's obvious when you try to play it with other speakers. 2. The main volume control isn't measurable, as it's built for the app, so you have to eyeball it when setting the volume (it never stops spinning). 3. From its size and power, it requires an external power supply. I used a 36v 10a power supply, which is PLENTY for it. 4. Since the terminals are so close together, be sure to turn off power before adding speakers to prevent shorts, and make sure there aren't any loose strands.
Review: This is a powerful amp. I recommend it. - I’ve got this powered by two Makita 18v batteries equaling 36v. I connected two Boss 6x9” coaxial speakers that are 4ohm each and a Skar 8” subwoofer that is 2ohm. I must say this amp is awesome! I ran it for 5 hours bumping hard in my shop that was 60 degrees and it didn’t even get warm. My shop was rattling. I ran it through a bass sweep and it does 30 to 50hz very good. It only used one bar on the battery indicator so I’d say it works well and is not a knock off. It connects to Bluetooth easily and reconnects if I go out and then back in which is a big deal to me. The connection voice is English and is pleasant. Definitely worth it.

## Features

- 【HI-FI & Stereo】High-quality 2.1-channel 220W+220W+350W Bluetooth 5.1 amplifier board, with multiple audio input methods such as AUX, Bluetooth, U disk, and USB sound card, allowing you to enjoy the fun of music anytime, anywhere.
- 【Function upgrade】Supports APP control, and can modify Bluetooth name and password settings. The 5.1 Bluetooth version has settings such as adjustable volume, sound on/off, and timed shutdown. Comes with 10 natural sleep songs and up to 1023 sound combinations. Not only can you display the playlist of the U disk, you can also shake the phone to change songs or use the dial/mode key to switch songs.
- 【Professional chip】Using 2 Texas Instruments TPA3255 chips, it is a high-performance Class D amplifier with Class D efficiency, which can bring true high-end sound quality. The device adopts advanced integrated feedback design and proprietary high-speed gate driver error correction technology. This technology enables the device to maintain ultra-low distortion across the entire audio band while providing high-definition sound quality.
- 【Super Compatibility】 5.1 Bluetooth version, with higher transmission efficiency, more stability and longer transmission distance. In open space, the wireless range can reach 15 meters (49 feet). It can be widely used in various devices such as tablets, PCs, TVs, smartphones, laptops, etc.
- 【Safety Protection】 The amplifier board has short circuit, overcurrent, overheating and anti-static protection to prevent complete failure. When overloaded, the device will report the fault to the processor to protect itself from damage.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0DGTLR66N |
| Best Sellers Rank | #41,361 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in Audio Amplifiers |
| Brand | Hosyond |
| Date First Available | September 12, 2024 |
| Item Weight | 13.4 ounces |
| Item model number | ZK-AS21 |
| Manufacturer | Hosyond |
| Material | PCB, Plastic |
| Maximum Supply Voltage | 38 Volts (DC) |
| Minimum Supply Voltage | 16 Volts (DC) |
| Mounting Type | Through-Hole Mount |
| Number of Channels | 2 |
| Output Power | 350 Watts |
| Package Dimensions | 6.38 x 5.71 x 2.05 inches |
| Package Type Name | Protective Shell |
| Specification Met | Basic Safety Standards |
| Supply Current | 10 Amps |
| UPC | 768572762794 |
| Voltage | 12 Volts (DC) |

## Product Details

- **Manufacturer:** Hosyond
- **Maximum Supply Voltage:** 38 Volts (DC)
- **Minimum Supply Voltage:** 16 Volts (DC)
- **Mounting Type:** Through-Hole Mount
- **Voltage:** 12 Volts (DC)

## Images

![ZK-AS21 TPA3255 Bluetooth 5.1 Power Amplifier Board HiFi 2.1 Channel 220Wx2+350W Digital Audio Receiver AMP Board with Treble and Bass Control for DIY Speakers - Image 1](https://m.media-amazon.com/images/I/61ryw+UucjL.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Pros and Cons
*by D***E on December 27, 2025*

Amazing, powerful little amplifier. The app isn't the best, but considering it's $30, it's pretty good. It's able to power a subwoofer, 2 tweeters, and 2 midranges with no problem. Its built in cooling fan keeps it ice cold, so there's no need to worry about overheating. Its size is also very compact, making it easy to take with you. Its bluetooth is amazing, with absolutely zero noise whatsoever, compared to its little brother ZK-MT21. Now, onto the CONS: 1. For some reason, the AUX input is delayed, and it's obvious when you try to play it with other speakers. 2. The main volume control isn't measurable, as it's built for the app, so you have to eyeball it when setting the volume (it never stops spinning). 3. From its size and power, it requires an external power supply. I used a 36v 10a power supply, which is PLENTY for it. 4. Since the terminals are so close together, be sure to turn off power before adding speakers to prevent shorts, and make sure there aren't any loose strands.

### ⭐⭐⭐⭐⭐ This is a powerful amp. I recommend it.
*by R***N on November 2, 2025*

I’ve got this powered by two Makita 18v batteries equaling 36v. I connected two Boss 6x9” coaxial speakers that are 4ohm each and a Skar 8” subwoofer that is 2ohm. I must say this amp is awesome! I ran it for 5 hours bumping hard in my shop that was 60 degrees and it didn’t even get warm. My shop was rattling. I ran it through a bass sweep and it does 30 to 50hz very good. It only used one bar on the battery indicator so I’d say it works well and is not a knock off. It connects to Bluetooth easily and reconnects if I go out and then back in which is a big deal to me. The connection voice is English and is pleasant. Definitely worth it.

### ⭐⭐⭐⭐⭐ Surround System
*by R***S on February 1, 2026*

The fan is loud, so I disconnected it. I don't have overheating issues, because it's only use when I'm using the projector in the HT room. I connected a Klipsch surround system and it sounds awesome.

## Frequently Bought Together

- Hosyond TPA3255 Bluetooth 5.1 Power Amplifier Board HiFi 2.1 Channel 220Wx2+350W Digital Audio Receiver Power Amplifier Module with Treble and Bass Control for DIY Speakers
- DAJUNGUO S600X 2.1 Channel Amplifier Board 300W+300W+600W Power Output,TPA3255 Chip,Bluetooth 5.2,Black

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-01*