---
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: "30818CFA"
currency: XOF
in_stock: true
reviews_count: 9
category: "Dajunguo"
url: https://www.desertcart.sn/products/368986425-bluetooth-power-amplifier-board-with-subwoofer-2-1-channel-50w
store_origin: SN
region: Senegal
---

# 200W total output power 12-24V wide voltage input Adjustable treble & bass controls 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:** 30818CFA
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your sound game—because your speakers deserve the upgrade!

## 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?** 30818CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/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

- • **Versatile Connectivity:** Seamlessly connect via Bluetooth, AUX, or USB drive—compatible with phones, TVs, laptops, and more.
- • **Compact & Durable Design:** Sleek surface-mount form factor fits effortlessly into any setup, backed by responsive 24/7 customer support.
- • **Robust Protection System:** Built-in safeguards against short-circuit, over-current, overheating, and reverse polarity ensure reliable, worry-free operation.
- • **Customizable Sound Profile:** Fine-tune your audio with dedicated treble and bass knobs for a perfectly layered and dynamic listening experience.
- • **Powerful 2.1 Channel Output:** Experience immersive sound with 50W×2 stereo plus 100W subwoofer power for rich, room-filling audio.

## Overview

The ZK-MT21 is a compact, high-performance Bluetooth power amplifier delivering 200W total output across 2.1 channels. It supports multiple input methods including Bluetooth, AUX, and USB, and features adjustable treble and bass controls for personalized audio tuning. Designed with advanced protection mechanisms, it ensures safe and reliable operation within a wide 12-24V voltage range, making it ideal for upgrading existing speaker systems with professional-grade sound quality.

## 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: Great Little amp! - I was very skeptical about this little amp. Well let me tell you that this thing works great! I read that some said it over heated so I mounted inside of an aluminum box with two fans. I used this amp to reuse my old set of EV speakers. They are a really nice set of speakers with a subwoofer. Well the internal amp went bad so I gutted them and wired them direct. With this little amp they sound better that they did with the original internal amp. The stereo separation is great and the subwoofer kicks way more than it did with the original amp. I just purchased two more of the little amps. I don't know how long it will last but right now this thing works great. I don't know how many watts this thing really puts out but it is quite enough to power most speakers.
Review: it works ok in a dusty and hot environment, depending on the speakers it can get fairly loud - this has been in use for a few years as a garage amp. no issues whatsoever, the bluetooth range is acceptable but lacks security (no password required to pair).

## 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 | #34,636 in Electronics ( See Top 100 in Electronics ) #178 in Audio Component Amplifiers |
| Brand | DAJUNGUO |
| Date First Available | September 30, 2021 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 4.6 ounces |
| Item dimensions L x W x H | 4.37 x 4.05 x 1.02 inches |
| Item model number | ZK-MT21 |
| Manufacturer | DAJUNGUO |
| Maximum Supply Voltage | 24 Volts |
| Minimum Supply Voltage | 12 Volts (DC) |
| Mounting Type | Surface Mount |
| Number of Channels | 2 |
| Output Power | 200 Watts |
| Package Type Name | Hard Case |
| Product Dimensions | 4.37 x 4.05 x 1.02 inches |
| Supply Current | 5 Amps |
| UPC | 194852390669 |
| 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 (DC)
- **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)

## 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

### ⭐⭐⭐⭐⭐ Great Little amp!
*by M***S on March 27, 2023*

I was very skeptical about this little amp. Well let me tell you that this thing works great! I read that some said it over heated so I mounted inside of an aluminum box with two fans. I used this amp to reuse my old set of EV speakers. They are a really nice set of speakers with a subwoofer. Well the internal amp went bad so I gutted them and wired them direct. With this little amp they sound better that they did with the original internal amp. The stereo separation is great and the subwoofer kicks way more than it did with the original amp. I just purchased two more of the little amps. I don't know how long it will last but right now this thing works great. I don't know how many watts this thing really puts out but it is quite enough to power most speakers.

### ⭐⭐⭐⭐⭐ it works ok in a dusty and hot environment, depending on the speakers it can get fairly loud
*by D***H on October 29, 2025*

this has been in use for a few years as a garage amp. no issues whatsoever, the bluetooth range is acceptable but lacks security (no password required to pair).

### ⭐⭐⭐⭐⭐ 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!

## Frequently Bought Together

- Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control for DIY Bluetooth Audio and Store Home Theater
- APIELE 16mm Latching Push Button Switch 12V DC On Off Black Shell with LED Angel Eye Head for 0.63" Mounting Hole with Wire Socket Plug Self-Locking (Blue/Black Shell)
- Kzreect for Power Wheel Adapter Compatible with Milwaukee 18V Battery, Converter Kit with Fuse Holder, Switch, Terminal, 12AWG Wire for DIY RC Car Toys (1 Pack)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.sn/products/368986425-bluetooth-power-amplifier-board-with-subwoofer-2-1-channel-50w](https://www.desertcart.sn/products/368986425-bluetooth-power-amplifier-board-with-subwoofer-2-1-channel-50w)

---

*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-03-22*