---
product_id: 633316863
title: "ZK-AS21 220W*2+350W 2.1 Bluetooth Power Amplifier Board with TPA3255 Chip, 18V-36V Bluetooth Speaker Audio Amplifier Module"
brand: "dajunguo"
price: "6236592₫"
currency: VND
in_stock: true
reviews_count: 5
category: "Dajunguo"
url: https://www.desertcart.vn/products/633316863-zk-as21-220w-2-350w-2-1-bluetooth-power-amplifier
store_origin: VN
region: Vietnam
---

# 570W peak power output 2.1 channel stereo with subwoofer support Adjustable treble & bass controls ZK-AS21 220W*2+350W 2.1 Bluetooth Power Amplifier Board with TPA3255 Chip, 18V-36V Bluetooth Speaker Audio Amplifier Module

**Brand:** dajunguo
**Price:** 6236592₫
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your sound game — power, precision, and protection in one sleek amp!

## Quick Answers

- **What is this?** ZK-AS21 220W*2+350W 2.1 Bluetooth Power Amplifier Board with TPA3255 Chip, 18V-36V Bluetooth Speaker Audio Amplifier Module by dajunguo
- **How much does it cost?** 6236592₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/633316863-zk-as21-220w-2-350w-2-1-bluetooth-power-amplifier)

## 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

- • **Precision Audio Tuning:** Customize your soundscape with dedicated treble and bass knobs for a perfectly layered listening experience.
- • **Robust Protection Suite:** Built-in safeguards including short circuit, overvoltage, undervoltage, and clipping protection ensure worry-free operation.
- • **Wide Voltage Compatibility:** Operates seamlessly between 18V-36V, compatible with most DC adapters for versatile setups.
- • **Unmatched Power Performance:** Delivers a thunderous 220W*2 + 350W output to shake any room with crystal-clear sound.
- • **Pro-Level Bluetooth Connectivity:** Stable, priority Bluetooth input lets you wirelessly stream your favorite tracks with zero compromise.

## Overview

The ZK-AS21 is a compact yet powerhouse 2.1 Bluetooth amplifier board featuring dual TPA3255 chips, delivering up to 570W peak output. It supports wide voltage input (18-36V) and offers fine-tuned treble and bass controls for audiophile-grade sound customization. Designed for professionals and enthusiasts alike, it includes comprehensive protection mechanisms and seamless Bluetooth connectivity, making it a top-tier choice for high-fidelity audio setups.

## Description

ZK-AS21 220W*2+350W 2.1 Bluetooth Power Amplifier Board with TPA3255 Chip, 18V-36V Bluetooth Speaker Audio Amplifier Module : desertcart.in: Electronics

Review: buen producto
Review: EDIT:: 1 month (ish) into owning ::: Still unreasonably impressive. Will probably report again in another 3 months. Been using it constantly, hours every day. It's protection circuits function properly too, it easily survived a fairly catastrophic failure of a 360w switching DC power supply. (Was fireworks) Im blown away every time i turn this thing on. Fantastic choice in filtering capacitors as well, they burned in very nicely. The sound quality of this amp is, in my opinion, superior to my yamaha s801 at all listenable volume levels. It's almost painful to say it, but it's the truth. Post burn-in with a properly tuned set of speakers and a sub, this is reference quality sound 100%. I cannot even begin to fathom what may be possible in class D in another 10 years. Pretty sure i could be quoted in saying "it's not possible for class d to be as clean aas class a/b, let alone class A" Yea, well, if you don't think class D will, and some day quite soon, be the indisputable king of amplification technology, you just simply do not understand how this kind of technology evolves and progresses. Ive had Zero issues, the reviews that mention power cycling, yea they have a bluetooth device auto connecting killing their analog audio feed. BT gets first priority with this amp, always check your bluetooth devices if you are facing this issue. Anyone who says this amp does not provide enough power are definitely using a sub standard power supply. Im running it at about 600 watts on 36v now, and it can shake the walls long before it starts to distort. The detail and high frequency clarity, makes the yamaha (no slouch at all) seem blurry by comparison. The difference is subtle, but once noticed makes ya step back, and say WOW. I am not going easy on this thing either, i push it hard, and i push it often. Another big benefit i've noticed, is my listening space doesn't slowly get hotter as i listen at volume. I will probably be purchasing a fosi audio bt30d pro to replace the yamaha in the living room, and this whuzi amp will be living on my desk for the foreseeable for mix referencing. ORIGINAL REVIEW::: Packaging was adequate, unit arrived in one piece of works as expected to. Really, it's one of the most impressive peices of audio equipment, for the money, that i've ever come across. I cannot speak for the reliability of this amp yet, however... Running it from a 36v 11a switching DC power supply with a dc noise reducer between the amp and power supply, I am unreasonably impressed. The power output, and sound quality is phenomenal, and it compares favorably to a yamaha s801 reciever when it moderate and low volumes. Will make a perfect far field reference amp when i switch off the near field monitors and step back. And i can finally stop going back and forth to another room when i want to reference how some changes in a mix will translate to a fully fledged stereo image. Paired up with some re-invigored vintage Acoustic Research series 660 far field monitors outfitted with Dayton reference drivers and GRS Ribbons and a dayton reference 10" HO sub in a sealed/braced 1cuft enclosure. Had previously tried out dajunguo's tda7948 2.1 offering, and it sounded good, very listenable, but it made my tweeters have a strange resonance, and as fragile as ribbons are that's a no go in my mind. I gave that amp away. Did some research and determined the tpa3255 chipset to be what i was really after, and it was. At moderate volumes (definitely not quiet) with an adequate power supply, this amp has more output then ill ever need for the intended purpose, and it's sound quality is far beyond what i expected. The stereo image extends out beyond the drivers in every direction. The articulation and detail is FAR beyond its price point. And the low end response is more present, powerful, smoother, tighter, and somehow more open then the dayton amp i was using in conjuction with the yamaha s801. The mid range detail, and high end clarity and imaging accuracy is absolutely on par with the s801, the yamaha pulls away pretty handily at loud volumes though. But it's also not powering a passive subwoofer on its own, so that should be that way. Im sure the yamaha will still be serving someone the desired purpose in 20 years. This amp will probably be long since dead. However, you can buy 16 of these for the cost of the yamaha. In my opinion, that favors this little guy pretty handily for anyone who cant really eat a large purchase, which is many, many people now a days. If it lasts more then a year, then the Yamaha actually loses the comparison on all fronts in my head. Anyone who doesn't think class D *will*, and one day soon, be the reigning king of amplification technology, just has no idea how digital technology actually works, or evolves. I hope it stays working well, because it scares me every time i move that heavy yamaha and power it back on. But i feel like i can literally toss this thing around, and it can fit in a handbag pocket.

## Features

- 【TPA3255 HIFI CHIP】The ZK-AS21 power amplifier board uses two TPA3255 power amplifier chips.Support wide voltage input:18-36V, power up to 220W*2+350W (PMPO).
- 【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 ZK-AS21 power amplifier board, you can make the sound more layered and make the bass more shocking.
- 【HIGH COMPATIBILITY】The DC adapters on the market (plug size 5.5mm*2.1mm) can basically meet the needs of the XY-S350H Bluetooth power amplifier board. If you don't have a DC plug, please don't worry, you can also directly connect the positive and negative poles of the wire to the power socket of the amplifier board.
- 【PROTECTION FUNCTION】ZK-AS21 Bluetooth power amplifier board has multiple protection mechanisms to ensure its safe operation. With short circuit protection, undervoltage protection, overvoltage protection, clipping protection.
- 【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 100% Satisfactory Answer

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0B8H6J3NB |
| Are batteries included? | No |
| Brand | DAJUNGUO |
| Colour | Black |
| Customer Reviews | 4.2 4.2 out of 5 stars (60) |
| Date First Available | 22 April 2024 |
| Included Components | AMPLIFIER BOARD |
| Item Dimensions LxWxH | 13 x 11.6 x 2.7 Centimeters |
| Item Height | 1.06 Inches |
| Item Weight | 327 g |
| Item Width | 4.56 Inches |
| Item dimensions L x W x H | 13 x 11.6 x 2.7 Centimeters |
| Item model number | ZK-AS21 |
| Manufacturer | DAJUNGUO |
| Maximum Supply Voltage | 36 Volts |
| Model number | ZK-AS21 |
| Mounting Type | Surface Mount |
| Number of Channels | 2 |
| Number of Memory Sticks | 1 |
| Output Power | 570 Watts |
| Power Source | DC |
| Product Dimensions | 12.98 x 11.58 x 2.69 cm; 327 g |
| Specification Met | FCC, RoHS |
| UPC | 194852391048 |
| Voltage | 36 Volts |

## Product Details

- **Item dimensions L x W x H:** 13 x 11.6 x 2.7 Centimeters
- **Manufacturer:** DAJUNGUO
- **Maximum Supply Voltage:** 36 Volts
- **Mounting Type:** Surface Mount
- **Voltage:** 36 Volts

## Images

![ZK-AS21 220W*2+350W 2.1 Bluetooth Power Amplifier Board with TPA3255 Chip, 18V-36V Bluetooth Speaker Audio Amplifier Module - Image 1](https://m.media-amazon.com/images/I/71DjhUPU93L.jpg)
![ZK-AS21 220W*2+350W 2.1 Bluetooth Power Amplifier Board with TPA3255 Chip, 18V-36V Bluetooth Speaker Audio Amplifier Module - Image 2](https://m.media-amazon.com/images/I/81vlFzxQRlL.jpg)
![ZK-AS21 220W*2+350W 2.1 Bluetooth Power Amplifier Board with TPA3255 Chip, 18V-36V Bluetooth Speaker Audio Amplifier Module - Image 3](https://m.media-amazon.com/images/I/81QrdPi-pAL.jpg)
![ZK-AS21 220W*2+350W 2.1 Bluetooth Power Amplifier Board with TPA3255 Chip, 18V-36V Bluetooth Speaker Audio Amplifier Module - Image 4](https://m.media-amazon.com/images/I/815muDlIS4L.jpg)
![ZK-AS21 220W*2+350W 2.1 Bluetooth Power Amplifier Board with TPA3255 Chip, 18V-36V Bluetooth Speaker Audio Amplifier Module - Image 5](https://m.media-amazon.com/images/I/81QXtKW62IL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by L***. on 16 December 2023*

buen producto

### ⭐⭐⭐⭐⭐ Review
*by G***E on 20 November 2023*

EDIT:: 1 month (ish) into owning ::: Still unreasonably impressive. Will probably report again in another 3 months. Been using it constantly, hours every day. It's protection circuits function properly too, it easily survived a fairly catastrophic failure of a 360w switching DC power supply. (Was fireworks) Im blown away every time i turn this thing on. Fantastic choice in filtering capacitors as well, they burned in very nicely. The sound quality of this amp is, in my opinion, superior to my yamaha s801 at all listenable volume levels. It's almost painful to say it, but it's the truth. Post burn-in with a properly tuned set of speakers and a sub, this is reference quality sound 100%. I cannot even begin to fathom what may be possible in class D in another 10 years. Pretty sure i could be quoted in saying "it's not possible for class d to be as clean aas class a/b, let alone class A" Yea, well, if you don't think class D will, and some day quite soon, be the indisputable king of amplification technology, you just simply do not understand how this kind of technology evolves and progresses. Ive had Zero issues, the reviews that mention power cycling, yea they have a bluetooth device auto connecting killing their analog audio feed. BT gets first priority with this amp, always check your bluetooth devices if you are facing this issue. Anyone who says this amp does not provide enough power are definitely using a sub standard power supply. Im running it at about 600 watts on 36v now, and it can shake the walls long before it starts to distort. The detail and high frequency clarity, makes the yamaha (no slouch at all) seem blurry by comparison. The difference is subtle, but once noticed makes ya step back, and say WOW. I am not going easy on this thing either, i push it hard, and i push it often. Another big benefit i've noticed, is my listening space doesn't slowly get hotter as i listen at volume. I will probably be purchasing a fosi audio bt30d pro to replace the yamaha in the living room, and this whuzi amp will be living on my desk for the foreseeable for mix referencing. ORIGINAL REVIEW::: Packaging was adequate, unit arrived in one piece of works as expected to. Really, it's one of the most impressive peices of audio equipment, for the money, that i've ever come across. I cannot speak for the reliability of this amp yet, however... Running it from a 36v 11a switching DC power supply with a dc noise reducer between the amp and power supply, I am unreasonably impressed. The power output, and sound quality is phenomenal, and it compares favorably to a yamaha s801 reciever when it moderate and low volumes. Will make a perfect far field reference amp when i switch off the near field monitors and step back. And i can finally stop going back and forth to another room when i want to reference how some changes in a mix will translate to a fully fledged stereo image. Paired up with some re-invigored vintage Acoustic Research series 660 far field monitors outfitted with Dayton reference drivers and GRS Ribbons and a dayton reference 10" HO sub in a sealed/braced 1cuft enclosure. Had previously tried out dajunguo's tda7948 2.1 offering, and it sounded good, very listenable, but it made my tweeters have a strange resonance, and as fragile as ribbons are that's a no go in my mind. I gave that amp away. Did some research and determined the tpa3255 chipset to be what i was really after, and it was. At moderate volumes (definitely not quiet) with an adequate power supply, this amp has more output then ill ever need for the intended purpose, and it's sound quality is far beyond what i expected. The stereo image extends out beyond the drivers in every direction. The articulation and detail is FAR beyond its price point. And the low end response is more present, powerful, smoother, tighter, and somehow more open then the dayton amp i was using in conjuction with the yamaha s801. The mid range detail, and high end clarity and imaging accuracy is absolutely on par with the s801, the yamaha pulls away pretty handily at loud volumes though. But it's also not powering a passive subwoofer on its own, so that should be that way. Im sure the yamaha will still be serving someone the desired purpose in 20 years. This amp will probably be long since dead. However, you can buy 16 of these for the cost of the yamaha. In my opinion, that favors this little guy pretty handily for anyone who cant really eat a large purchase, which is many, many people now a days. If it lasts more then a year, then the Yamaha actually loses the comparison on all fronts in my head. Anyone who doesn't think class D *will*, and one day soon, be the reigning king of amplification technology, just has no idea how digital technology actually works, or evolves. I hope it stays working well, because it scares me every time i move that heavy yamaha and power it back on. But i feel like i can literally toss this thing around, and it can fit in a handbag pocket.

### ⭐⭐⭐⭐⭐ Review
*by H***Y on 27 April 2023*

Bought this to replace a set of computer speakers I had in my garage and am really happy with it. I bought a 36v power supply for 15 dollars to run it, though I honestly didn't need to since I already had a couple ac adapters around that push 19v at 4.5amp and when tested they pushed this amp more than needed. The 36v power supply definitely upped the power though, only noticable in the subwoofer, and was worth it to me. Sound clarity is really good. Even with only being able to adjust the volume and frequency of the sub channel and the treble and bass of the speakers I was able to get this amp to sound great.....even before trying to mess with the equalizer on my Bluetooth source. Honestly this amp was able to produce clear non distorted bass no matter what the song, something my car with JBL and Infinity speakers cannot do, and at full volume crystal clear vocals and treble out of the two tower speakers. Bluetooth hooks up really quickly once paired and is pretty hassle free. With that I decided to make a garage stereo out of an unused cigar box that I had lying around and so far everyone that's taken a look at it has said they love it. Overall it was a fun project that I could do with my son and now I have a really decent to great stereo for summer driveway fires or working on cars in the garage. Cheers! P.s. I actually considered doing a hidden stereo build with this amp for a super clean look with the floating shelf since it's so small. Like stick it underneath the floating shelf and all the way back against the wall or hidden in a tool drawer, but decided I wanted to show this off. Also the cigae box allows me to close the lid and keep garage dust out. So in the end that's what won.

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-03-02*