---
product_id: 368986425
title: "Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control (ZK-MT21)"
brand: "dajunguo"
price: "R$271"
currency: BRL
in_stock: true
reviews_count: 10
category: "Dajunguo"
url: https://www.desertcart.com.br/products/368986425-bluetooth-power-amplifier-board-with-subwoofer-2-1-channel-50w
store_origin: BR
region: Brazil
---

# 50W×2 + 100W subwoofer power 12V-24V wide voltage input Adjustable treble & bass control Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control (ZK-MT21)

**Brand:** dajunguo
**Price:** R$271
**Availability:** ✅ In Stock

## Summary

> 🎵 Elevate your sound game—power, control, and protection in one sleek board!

## Quick Answers

- **What is this?** Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control (ZK-MT21) by dajunguo
- **How much does it cost?** R$271 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/368986425-bluetooth-power-amplifier-board-with-subwoofer-2-1-channel-50w)

## Best For

- dajunguo enthusiasts

## Why This Product

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

## Key Features

- • **Reliable 24/7 Support:** Dedicated customer service ensures your amplifier stays in top shape, anytime you need.
- • **Precision Audio Tuning:** Customize your sound with dedicated treble and bass knobs for a perfectly layered audio experience.
- • **Robust Safety Features:** Built-in short-circuit, over-current, over-heat, and reverse polarity protection for worry-free performance.
- • **Universal Connectivity:** Seamlessly connect via Bluetooth, AUX, or USB—compatible with all your favorite devices.
- • **Immersive 2.1 Channel Power:** Experience crystal-clear stereo with booming 100W subwoofer punch for your ultimate soundscape.

## Overview

The ZK-MT21 Bluetooth Power Amplifier Board delivers a powerful 2.1 channel output with 50W per stereo channel plus a 100W subwoofer, powered by the high-efficiency TPA3116D2 chip. It supports multiple inputs including Bluetooth, AUX, and USB, and features adjustable treble and bass controls for tailored audio. Designed for 12V-24V operation, it includes comprehensive protection mechanisms and is backed by responsive 24/7 customer support.

## Description

desertcart.com: Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control (ZK-MT21) : Electronics

Review: Works and sounds great, awesome product 😎 - Surprisingly powerful for it's compact size strong Bluetooth connection and sounds great, has separate volume controls for subwoofer and main volume. Great product, great price and works perfect for my custom built portable party speaker 👌😎
Review: Impressive! - I recently picked up a high end powered subwoofer, Klipsch to be exact. Upon getting it home, I found the preamp part didn't work. I got it at a deep discount so the woofer and enclosure was still worth it as long as I found an affordable amp for it. I got looking at single channel amps then I found this one that would replace my existing receiver altogether. It came in and I had an old power supply sitting around that actually plugged right in (12v, if more power is desired you can supply it with 21 or 24 volts, depending on speaker impedance). I was shocked at the output! Even at the lowest voltage powering the device, it's enough to piss off the neighbors. And that high end subwoofer? It sounds like it's powered by the original amp. The power, clarity, and sound definition are all exceptional! I love the separate subwoofer gain and adjustable low pass filter as well. This thing is amazing, not only for the size but also the price. I highly recommend if you can get by without a remote. The Bluetooth works great and is very clear as well. 5 stars!

## Features

- 【TPA3116D2 HIFI CHIP】TPA3116D2 HIFI Chip Solution: Stereo Dual-channel Output to Ensure Continuous Serial High-power Operation, THD ≤0.1%. Wide Voltage Input DC: 12-24V;
- 【MULTIPLE INPUT METHOD】The TB21 PROhas multiple input methods such as Bluetooth input, AUX input, and USB drive input. The vast majority of devices can be used, such as mobile phones, televisions, laptops, etc., making it easy to connect and use.
- 【TREBLE & BASS CONTROL】If you are tired of an amplifier with only one volume knob, then you feel right, because you have further requirements for audio. By adjusting the high and low frequency knobs of the power amplifier board, you can make the sound more layered and make the bass more shocking.
- 【PROTECTION FUNCTION】TB21 PROBluetooth power amplifier board has multiple protection mechanisms to ensure its safe operation. It has short-circuit protection, over-current, over-heat, and anti-reverse protection. When an overload occurs, the device reports the fault condition to the processor to protect itself from damage
- 【7 * 24 Hours After-sales Service】 Paying Attention To Customer Experience And Satisfying Customers Is Our Service Tenet. If You Have Any Questions About The Product, or The Product Has Quality Problems, Please Contact Us At Any Time, We Will Give You A Satisfactory Answer

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09HKB44JQ |
| Best Sellers Rank | #63,822 in Electronics ( See Top 100 in Electronics ) #378 in Audio Component Amplifiers |
| Brand Name | DAJUNGUO |
| Customer Reviews | 4.4 out of 5 stars 452 Reviews |
| Included Components | amplifier board |
| Item Dimensions | 4.37 x 4.05 x 1.02 inches |
| Item Weight | 130 g |
| Item dimensions L x W x H | 4.37 x 4.05 x 1.02 inches |
| Manufacturer | DAJUNGUO |
| Maximum Supply Voltage | 24 volts |
| Minimum Supply Voltage | 12 volts_of_direct_current |
| Model | ZK-MT21 |
| Mounting Type | Surface Mount |
| Number of Channels | 2 |
| Package Type Name | Hard Case |
| Part Number | ZK-MT21 |
| Supply Current | 5 A |
| UPC | 194852390669 |
| Unit Count | 1 Count |
| Voltage | 20 volts |

## Product Details

- **Item dimensions L x W x H:** 4.37 x 4.05 x 1.02 inches
- **Manufacturer:** DAJUNGUO
- **Maximum Supply Voltage:** 24 volts
- **Minimum Supply Voltage:** 12 volts_of_direct_current
- **Voltage:** 20 volts

## Images

![Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control (ZK-MT21) - Image 1](https://m.media-amazon.com/images/I/714fIG2S9cL.jpg)
![Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control (ZK-MT21) - Image 2](https://m.media-amazon.com/images/I/81r4Mf7N0GL.jpg)
![Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control (ZK-MT21) - Image 3](https://m.media-amazon.com/images/I/719kkiKdUqL.jpg)
![Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control (ZK-MT21) - Image 4](https://m.media-amazon.com/images/I/917O8QeMVVL.jpg)
![Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control (ZK-MT21) - Image 5](https://m.media-amazon.com/images/I/919ehXkAXEL.jpg)

## Available Options

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

## Questions & Answers

**Q: Can someone please recommend the correct battery to operate this product**
A: I purchased a 24Vdc@10 amps power supply.   A lithium battery supply from parts Express using 5 18650's cells is 21Vdc and would work just fine.

**Q: Will it be useful to install a crossover? or is it not necessary?**
A: I have tree of these running Speakers and sub-woofers with no crossover.

**Q: does the main volume affect the sub volume or are they completely independent?**
A: The sub volume is not completely independent . I guess it’s kinda like having a gain adjustment on a car stereo amp ..

**Q: What is the output wattage using a 12v input at 8 ohms?**
A: 12 watts or so.  To get 50W you need 24V at about 3.5 amps at 4 ohms.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works and sounds great, awesome product 😎
*by D***L on March 6, 2026*

Surprisingly powerful for it's compact size strong Bluetooth connection and sounds great, has separate volume controls for subwoofer and main volume. Great product, great price and works perfect for my custom built portable party speaker 👌😎

### ⭐⭐⭐⭐⭐ Impressive!
*by J***L on July 28, 2024*

I recently picked up a high end powered subwoofer, Klipsch to be exact. Upon getting it home, I found the preamp part didn't work. I got it at a deep discount so the woofer and enclosure was still worth it as long as I found an affordable amp for it. I got looking at single channel amps then I found this one that would replace my existing receiver altogether. It came in and I had an old power supply sitting around that actually plugged right in (12v, if more power is desired you can supply it with 21 or 24 volts, depending on speaker impedance). I was shocked at the output! Even at the lowest voltage powering the device, it's enough to piss off the neighbors. And that high end subwoofer? It sounds like it's powered by the original amp. The power, clarity, and sound definition are all exceptional! I love the separate subwoofer gain and adjustable low pass filter as well. This thing is amazing, not only for the size but also the price. I highly recommend if you can get by without a remote. The Bluetooth works great and is very clear as well. 5 stars!

### ⭐⭐⭐⭐⭐ If you found this BUY IT.
*by T***S on June 30, 2024*

I connected this to a pair of Powerbass S-Series Full Range 6.75" (S6752) speakers and a pair of Lanzar 6.5” Subs (MAXP64) in Series in a 6th-order box I built. (That's nerd speak for 2 door speakers and a subwoofer) And I'm floored by how good it sounds on my Android phone. The highs and Midrange are crystal clear. The lows are hard-hitting and don't cut out at all. The Bluetooth connection was fast, and the range was good. I can't believe how well it works. The board is made well, and the covers fit well. I'm an audio nerd, I love music, and this is incredible. It's 100 better than what I expected for less than $30. You can't go wrong.

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-10-05*