---
product_id: 781087184
title: "ZK-TB21 2.1 Channel Bluetooth Amplifier Board, 50W+50W+100W Output, IPEX-1 Antenna Base, 12-24V DC Input, Customizable Bluetooth Name (DAJUNGUO ZK-TB21 Black)"
brand: "damgoo"
price: "$41.92"
currency: USD
in_stock: true
reviews_count: 8
category: "Damgoo"
url: https://www.desertcart.us/products/781087184-zk-tb21-2-1-channel-bluetooth-amplifier-board-50w-50w
store_origin: US
region: United States of America
---

# 12-24V wide voltage input Bluetooth 5.1 + dual antenna for extended range 200W max output power ZK-TB21 2.1 Channel Bluetooth Amplifier Board, 50W+50W+100W Output, IPEX-1 Antenna Base, 12-24V DC Input, Customizable Bluetooth Name (DAJUNGUO ZK-TB21 Black)

**Brand:** damgoo
**Price:** $41.92
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your audio game with power, precision, and personalized connectivity!

## Quick Answers

- **What is this?** ZK-TB21 2.1 Channel Bluetooth Amplifier Board, 50W+50W+100W Output, IPEX-1 Antenna Base, 12-24V DC Input, Customizable Bluetooth Name (DAJUNGUO ZK-TB21 Black) by damgoo
- **How much does it cost?** $41.92 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/781087184-zk-tb21-2-1-channel-bluetooth-amplifier-board-50w-50w)

## Best For

- damgoo enthusiasts

## Why This Product

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

## Key Features

- • **Robust Safety Protections:** Built-in overheat, reverse polarity, and voltage safeguards ensure reliable, worry-free performance every time.
- • **Customizable Bluetooth Name:** Personalize your device’s Bluetooth ID to stand out in any environment—because your sound system should be as unique as you.
- • **Powerful 2.1 Channel Output:** Experience immersive sound with 50W+50W stereo plus 100W subwoofer power delivering crisp highs and deep bass.
- • **Flexible Voltage Compatibility:** Supports 12-24V DC input, perfect for versatile setups from desktops to home theaters without compromise.
- • **Seamless Bluetooth 5.1 Connectivity:** Effortlessly pair your devices with enhanced signal strength via onboard and external IPEX-1 antenna—no soldering needed.

## Overview

The ZK-TB21 is a compact 2.1 channel Bluetooth amplifier board delivering up to 200W total output (50W+50W stereo channels plus 100W subwoofer). Featuring Bluetooth 5.1 with dual antenna support for superior wireless range, it accepts a wide 12-24V DC input and offers customizable Bluetooth naming. Designed with advanced TPA3116D2 HiFi chip technology, it ensures low distortion (THD ≤0.1%) and includes comprehensive safety protections for stable, high-quality audio performance in versatile setups.

## Description

Buy ZK-TB21 2.1 Channel Bluetooth Amplifier Board, 50W+50W+100W Output, IPEX-1 Antenna Base, 12-24V DC Input, Customizable Bluetooth Name (DAJUNGUO ZK-TB21 Black): Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: A lot of audio quality and fun for 'pocket change' - Review for DAMGOO ZK-TB21 2.1 Channel Bluetooth Amplifier Board: I was happy to see that this amplifier is branded as a DAJUNGUO product. I've played with a range of similar mini-amplifiers, and the DAJUNGUO products do seem to deliver better audio quality than some others I've tried. (Mostly noticeable as smoother high-frequency response.) I do like the way the DAMGOO handles the subwoofer channel: once you set the subwoofer level, it tracks the balance between L/R and Sub as you turn the master L/R volume up or down. For me, this means less fiddling to constantly adjust the subwoofer level when I change listening levels. The bass and treble controls have reasonable hinge points for small top boxes. When initially setting this up, be aware that it is possible to set the crossover point for your sub so low (in frequency) that you may think the sub isn't working at all, or that it's not loud enough. This is more likely to cause confusion if you're using a small sub (8" or smaller), or a subwoofer that doesn't really have extended low frequency response. I'm powering this with a standard laptop power supply: 19.5V at 5 amps. The maximum output power of the amplifier is dependent on power supply voltage and current, so I'm not getting maximum power output from this. The trade-off for me is that laptop power supplies can be reasonably inexpensive, especially if you can source a used one. If you want to maximize the power output, you should probably expect to spend more money on the power supply than this amplifier. With my supply, and reasonably efficient speakers, the amp will play way too loud for typical desktop use, and easily loud enough for most home-theater use. (No, it won't play loud enough to rock the house, shake your window blinds, or throw a house party.) Bluetooth works well once enabled. I had no problems pairing, and a range of 50 feet was workable in open space with no obstructions. Like all of the low-cost mini-amps I've tried, switching between bluetooth and wired inputs sources is kind of frustrating, and is accompanied by changes of level and notification sounds that are too loud. Since the issue is so common, it's best to just learn to accept it and adjust to it, if low cost is important to you. (To be fair, a number of far more expensive mini-amps I've tried have the exact same issue with source switching.) The amp is tiny, and won't take much in the way of desk area-- the power supply you choose will probably be close to the same size as the amp. Like most budget mini-amps, this one is not completely enclosed in a case: the sides and rear are open and exposed, so pick your location to protect it from spills, debris, or children poking things into the side of the housing. At the time of this review, the cost is $18.98: audio quality and 'fun' are astonishingly low priced.
Review: wow! Very impressive - Wow! Sound quality was perfect

## Features

- 【Bluetooth 5.1+3.5MM AUX】The ZK-TB21 supports Bluetooth and AUX inputs, compatible with most devices such as smartphones, TVs, and laptops, allowing you to connect easily.
- 【TPA3116D2 HIFI Chip Solution】 Stereo Dual-channel Output to Ensure Continuous Serial High-power Operation, THD ≤0.1%. Wide Voltage Input DC: 12-24V;
- 【Enhanced Bluetooth Connectivity】Comes with both onboard and external IPX (MHF1) Bluetooth antenna base, improving signal strength and range without requiring soldering.
- 【Safety Protection】This Amp Board Has Overheat Protection, Reverse protection, Circuit Protection, Over-voltage and Under-voltage Protection；
- 【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 100% Satisfactory Answer.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0FN8CXZSY |
| Best Sellers Rank | #54,066 in Electronics ( See Top 100 in Electronics ) #298 in Audio Component Amplifiers |
| Brand | DAMGOO |
| Brand Name | DAMGOO |
| Customer Reviews | 3.8 out of 5 stars 9 Reviews |
| Item Dimensions | 47.24 x 39.37 x 8.66 inches |
| Item dimensions L x W x H | 47.24 x 39.37 x 8.66 inches |
| Manufacturer | DAMGOO |
| Maximum Output Power | 200 watts |
| Maximum Supply Voltage | 24 volts_of_direct_current |
| Minimum Supply Voltage | 12 volts_of_direct_current |
| Model | DAJUNGUO ZK-TB21 |
| Mounting Type | Freestanding |
| Number of Channels | 2 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Output Power | 200 watts |
| Part Number | ZK-TB21 |
| Specification Met | Amazon's Standards |
| Supply Current | 5 A |
| UPC | 194852391963 |
| Unit Count | 1 Count |

## Product Details

- **Item dimensions L x W x H:** 47.24 x 39.37 x 8.66 inches
- **Manufacturer:** DAMGOO
- **Maximum Supply Voltage:** 24 Volts (DC)
- **Minimum Supply Voltage:** 12 Volts (DC)
- **Mounting Type:** Freestanding

## Images

![ZK-TB21 2.1 Channel Bluetooth Amplifier Board, 50W+50W+100W Output, IPEX-1 Antenna Base, 12-24V DC Input, Customizable Bluetooth Name (DAJUNGUO ZK-TB21 Black) - Image 1](https://m.media-amazon.com/images/I/71asv+I-v4L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐ A lot of audio quality and fun for 'pocket change'
*by L***I on June 20, 2026*

Review for DAMGOO ZK-TB21 2.1 Channel Bluetooth Amplifier Board: I was happy to see that this amplifier is branded as a DAJUNGUO product. I've played with a range of similar mini-amplifiers, and the DAJUNGUO products do seem to deliver better audio quality than some others I've tried. (Mostly noticeable as smoother high-frequency response.) I do like the way the DAMGOO handles the subwoofer channel: once you set the subwoofer level, it tracks the balance between L/R and Sub as you turn the master L/R volume up or down. For me, this means less fiddling to constantly adjust the subwoofer level when I change listening levels. The bass and treble controls have reasonable hinge points for small top boxes. When initially setting this up, be aware that it is possible to set the crossover point for your sub so low (in frequency) that you may think the sub isn't working at all, or that it's not loud enough. This is more likely to cause confusion if you're using a small sub (8" or smaller), or a subwoofer that doesn't really have extended low frequency response. I'm powering this with a standard laptop power supply: 19.5V at 5 amps. The maximum output power of the amplifier is dependent on power supply voltage and current, so I'm not getting maximum power output from this. The trade-off for me is that laptop power supplies can be reasonably inexpensive, especially if you can source a used one. If you want to maximize the power output, you should probably expect to spend more money on the power supply than this amplifier. With my supply, and reasonably efficient speakers, the amp will play way too loud for typical desktop use, and easily loud enough for most home-theater use. (No, it won't play loud enough to rock the house, shake your window blinds, or throw a house party.) Bluetooth works well once enabled. I had no problems pairing, and a range of 50 feet was workable in open space with no obstructions. Like all of the low-cost mini-amps I've tried, switching between bluetooth and wired inputs sources is kind of frustrating, and is accompanied by changes of level and notification sounds that are too loud. Since the issue is so common, it's best to just learn to accept it and adjust to it, if low cost is important to you. (To be fair, a number of far more expensive mini-amps I've tried have the exact same issue with source switching.) The amp is tiny, and won't take much in the way of desk area-- the power supply you choose will probably be close to the same size as the amp. Like most budget mini-amps, this one is not completely enclosed in a case: the sides and rear are open and exposed, so pick your location to protect it from spills, debris, or children poking things into the side of the housing. At the time of this review, the cost is $18.98: audio quality and 'fun' are astonishingly low priced.

### ⭐⭐⭐⭐⭐ wow! Very impressive
*by R***R on July 17, 2026*

Wow! Sound quality was perfect

### ⭐ Poor quality, pay more for a better product
*by C***A on March 24, 2026*

Amp stopped working the day it arrived

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-22*