---
product_id: 629537133
title: "ZK-MT21 2.1 Channel Bluetooth Audio Power Amplifier Board 50W×2+100W with Treble and Bass Control for DIY Bluetooth Speaker Home Theater"
brand: "hosyond"
price: "¥5936"
currency: JPY
in_stock: true
reviews_count: 8
category: "Hosyond"
url: https://www.desertcart.jp/products/629537133-zk-mt21-2-1-channel-bluetooth-audio-power-amplifier-board
store_origin: JP
region: Japan
---

# 12-24V DC power input Bluetooth 5.0, 49ft range 200W total output power ZK-MT21 2.1 Channel Bluetooth Audio Power Amplifier Board 50W×2+100W with Treble and Bass Control for DIY Bluetooth Speaker Home Theater

**Brand:** hosyond
**Price:** ¥5936
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your DIY audio game—because your sound deserves to be legendary!

## Quick Answers

- **What is this?** ZK-MT21 2.1 Channel Bluetooth Audio Power Amplifier Board 50W×2+100W with Treble and Bass Control for DIY Bluetooth Speaker Home Theater by hosyond
- **How much does it cost?** ¥5936 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/629537133-zk-mt21-2-1-channel-bluetooth-audio-power-amplifier-board)

## 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

- • **Effortless Integration:** Copper DC connectors and barrier terminals handle high currents without heat, plus easy power hookup with included DC lead.
- • **Tailor Your Soundscape:** Adjust treble and bass knobs to craft crisp highs and earth-shaking lows, perfect for audiophile-level DIY setups.
- • **Power that Packs a Punch:** Delivers a robust 2x50W + 100W output for immersive sound that fills any room or custom build.
- • **Built to Protect & Perform:** Advanced short circuit, overcurrent, and overheating protections keep your investment safe and sound.
- • **Seamless Wireless Connectivity:** Bluetooth 5.0 ensures quick pairing and stable streaming up to 49 feet—ditch the cables, keep the vibe.

## Overview

The ZK-MT21 is a compact yet powerful 2.1 channel Bluetooth amplifier board delivering 200W total output (2x50W + 100W subwoofer). Featuring Bluetooth 5.0 with a 49-foot range and dual input options (Bluetooth and 3.5mm AUX), it offers customizable treble and bass controls for rich, layered sound. Designed with robust protection circuits and high-quality copper connectors, it ensures reliable performance and easy integration into home theaters or DIY speaker projects.

## Description

Product description How to Select the Audio Input Mode This amplifier board has two input modes: Bluetooth and 3.5mm AUX . When both modes input audio signals at the same time, the amplifier board will give priority to the Bluetooth mode; If you need to use the AUX mode, please make sure that the Bluetooth connection is disconnected. Parameters Model: ZK-MT21 Bluetooth Version: 5.0 (Without occlusion 49 Feet) Audio Input: AUX + Bluetooth Channel: 2.1 Stereo Adaption Supply Voltage: 12-24V / 5A above(Do not connect to 24V battery pack) Speaker: 20-100W, 4-8Ohm Output Power: max 50W R&L channel; max 100W subwoofer Protection Mechanism: Anti reverse connection, overheating, overcurrent, short circuit protection NOTE To have enough output power if the audio input is sufficient and the supply voltage/current is sufficient. The power supply voltage is higher and the relative power will be larger. The speakers with different impedances will have different output power. In the case of sufficient voltage and current, the larger the ohms of the horn, the smaller the relative sound power. Please ensure that the power of the adaptor is greater than the actual working power of the amplifier. (A power supply of more than 12V 5A is recommended.) Independent Control of Treble and Bass The bass audio and volume can be adjusted separately, and with the left and right channel speakers, the 2.1 channel brings you a richer sound experience. Extra-large Heat Sink The extra-large heat sink can provide good heat dissipation for the continuous high-power output of the AMP, thus preventing the chip from being burned. Easy to Connect The universal 5.5mm*2.1mm DC power interface can be compatible with most of the DC power adapters. Supports 3.5mm audio input. Quick-connect terminal blocks make wiring easier Package Includes Bluetooth Amplifier board * 1 Acrylic shell * 2 Knob * 5 Screwdriver * 1 DC plug adapter * 1

Review: The one to buy - I'm more impressed with this one over the larger 36v $36 one of a different brand I was using that cooling fan crapped out. This one sounds better more dynamic and seems to have as much power at 24v also I had to unplug the 3.5mm jack to use the Bluetooth this one you can just link to it even while using the jack as input and it was half the price and no fan to crap out. I'm using for my tv I boxed in the stud cavity's in the wall under my tv and cut in a 6.5" component set and an 8" subwoofer, it's pretty sweet, I also used PVC pipe to install a port into the subwoofer cavity I had to replace the sheetrock with plywood and mud it in like drywall also the sheetrock couldn't support the pressure good even with a wood ring glued on.
Review: Not bad for a cheap sound system. - I'm actually surprised that this works as well as it does. I hooked it up to the speakers in an old Samsung TV soundbar and subwoofer. I usually connect via Bluetooth from my laptop. It sounds much better than anything this cheap has a right to sound. Everything functions, the Bluetooth is reliable. I can't figure out if this is the amp, but I have to keep turning down the subwoofer, probably because the speaker I hooked it up to is cheap. Otherwise, it's loud and clear.

## Features

- [Two Input Methods] It has two audio input methods: Bluetooth and 3.5mm AUX. Bluetooth 5.0 version, higher transmission efficiency, transmission distance up to 49 feet (no obstruction).
- [Treble and Bass Adjustment] 2.1 channel, maximum output power 2X50W+100W. By adjusting the high and low frequency knobs, you can make the sound more layered and the bass more shocking.
- [Protection Function] It has short circuit protection, overcurrent, overheating, and anti-reverse connection protection. When an overload occurs, the device reports the fault condition to the processor to protect itself from damage.
- [High Quality] Features copper DC connectors and barrier style terminals. It can withstand large currents without generating heat or damaging wires. Comes with a DC head lead, which is compatible with the input power interface of this product. Even if you don’t have a DC head adapter or battery, you can easily connect it.
- [Application] Widely used in store solicitation, home theaters, DIY speakers, etc. If you have any questions about the product, or the product has quality problems, please feel free to contact us and we will give you a satisfactory answer.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CYLW7NRC |
| Brand | Hosyond |
| Brand Name | Hosyond |
| Customer Reviews | 4.5 out of 5 stars 210 Reviews |
| Included Components | 2.1 Bluetooth Amplifier board |
| Manufacturer | Hosyond |
| Material Type | Copper |
| Maximum Supply Voltage | 24 Volts (DC) |
| Minimum Supply Voltage | 12 Volts (DC) |
| Model | MT21 |
| Mounting Type | Surface Mount |
| Number of Channels | 2 |
| Output Power | 50 Watts |
| Package Type Name | Box or Clamshell |
| Part Number | MT21 |
| Specification Met | CE |
| UPC | 768572762640 |
| Voltage | 12 Volts (DC) |
| Warranty Description | NO |

## Product Details

- **Manufacturer:** Hosyond
- **Maximum Supply Voltage:** 24 Volts (DC)
- **Minimum Supply Voltage:** 12 Volts (DC)
- **Mounting Type:** Surface Mount
- **Voltage:** 12 Volts (DC)

## Images

![ZK-MT21 2.1 Channel Bluetooth Audio Power Amplifier Board 50W×2+100W with Treble and Bass Control for DIY Bluetooth Speaker Home Theater - Image 1](https://m.media-amazon.com/images/I/61hFCgUy5YL.jpg)
![ZK-MT21 2.1 Channel Bluetooth Audio Power Amplifier Board 50W×2+100W with Treble and Bass Control for DIY Bluetooth Speaker Home Theater - Image 2](https://m.media-amazon.com/images/I/71KwqPL5FLL.jpg)
![ZK-MT21 2.1 Channel Bluetooth Audio Power Amplifier Board 50W×2+100W with Treble and Bass Control for DIY Bluetooth Speaker Home Theater - Image 3](https://m.media-amazon.com/images/I/61SBzxA8PrL.jpg)
![ZK-MT21 2.1 Channel Bluetooth Audio Power Amplifier Board 50W×2+100W with Treble and Bass Control for DIY Bluetooth Speaker Home Theater - Image 4](https://m.media-amazon.com/images/I/71N5tRo2lfL.jpg)
![ZK-MT21 2.1 Channel Bluetooth Audio Power Amplifier Board 50W×2+100W with Treble and Bass Control for DIY Bluetooth Speaker Home Theater - Image 5](https://m.media-amazon.com/images/I/71txArA9yYL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ The one to buy
*by A***Z on November 1, 2025*

I'm more impressed with this one over the larger 36v $36 one of a different brand I was using that cooling fan crapped out. This one sounds better more dynamic and seems to have as much power at 24v also I had to unplug the 3.5mm jack to use the Bluetooth this one you can just link to it even while using the jack as input and it was half the price and no fan to crap out. I'm using for my tv I boxed in the stud cavity's in the wall under my tv and cut in a 6.5" component set and an 8" subwoofer, it's pretty sweet, I also used PVC pipe to install a port into the subwoofer cavity I had to replace the sheetrock with plywood and mud it in like drywall also the sheetrock couldn't support the pressure good even with a wood ring glued on.

### ⭐⭐⭐⭐⭐ Not bad for a cheap sound system.
*by R***R on January 7, 2026*

I'm actually surprised that this works as well as it does. I hooked it up to the speakers in an old Samsung TV soundbar and subwoofer. I usually connect via Bluetooth from my laptop. It sounds much better than anything this cheap has a right to sound. Everything functions, the Bluetooth is reliable. I can't figure out if this is the amp, but I have to keep turning down the subwoofer, probably because the speaker I hooked it up to is cheap. Otherwise, it's loud and clear.

### ⭐⭐⭐⭐⭐ Great bargain, lots of fun
*by E***A on April 24, 2026*

Tiny, lightweight, powerful, and very affordable. Dialing in the bass to fit the mains is awesome. Two issues to solve however. It is so lightweight that eight wires attached at the rear will pull the amp off the shelf if not careful. If laid flat, it is difficult to grip and turn the pots. Ziptied to a vesa mount I had works great for me.

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-05-17*