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)
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Model: ZK-MT21
Features
- TPA3116D2 HIFI CHIPTPA3116D2 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 METHODThe 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 CONTROLIf 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 FUNCTIONTB21 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
Item dimensions L x W x H: 4.37 x 4.05 x 1.02 inches
Voltage: 20 Volts
Manufacturer: DAJUNGUO
Maximum Supply Voltage: 24 Volts
Minimum Supply Voltage: 12 Volts (DC)
Item dimensions L x W x H: 4.37 x 4.05 x 1.02 inches
Voltage: 20 Volts
Manufacturer: DAJUNGUO
Maximum Supply Voltage: 24 Volts
Minimum Supply Voltage: 12 Volts (DC)
Mounting Type: Surface Mount
Brand: DAJUNGUO
Number of Channels: 2
Output Power: 200 Watts
Package Type Name: Hard Case
Supply Current: 5 Amps
UPC: 194852390669
Product Dimensions: 4.37 x 4.05 x 1.02 inches
Item Weight: 4.6 ounces
Item model number: ZK-MT21
Is Discontinued By Manufacturer: No
Date First Available: September 30, 2021
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To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Model: ZK-MT21
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.
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Reviewed in the United States on March 27, 2023 by MFS
Model: ZK-MT21
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).
Reviewed in the United States on October 29, 2025 by dh
Model: ZK-MT21
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!
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Reviewed in the United States on July 28, 2024 by Joe Bassel
Model: ZK-MT21
I bought this to provide a super-simple audio source for my teenage daughter's bedroom. This lil' dude fit the bill. It is no bigger than a sandwich and can be placed in an unobtrusive place. Set up and build was pretty straightforward (I do have electronics experience, so my learning curve may be slightly lower than some) the instructions are a bit hard to follow if that's all you are relying on but doable. And yes, parts and pieces are small to tiny but THAT'S THE POINT. I was able to use slightly thicker gauge, speaker wire by nipping off enough jacket to form a "y" with the naked wire and feed it on either side of the connection set screw, instead of the whole twist being on one side of the set screw. Just be patient. One thing I noticed and this may be more of an issue with the power supply(just bought the recommended) when plugging the PS into the amp, the connector sparks a tiny bit every time IFyou are already supplied A/C from your outlet, plug in the amp side first. It wasn't enough for me to be concerned but rather a condition that probably wouldn't pass UL standards. You be the judge. Amp has sufficient power @4ohms to crank a pair of descent bookshelf sized or smaller speakers. It'll get pretty loud and remain clear till you don't want to go much louder. I wasn't using all that great of speakers but fidelity was fine for it's application. The sub channel was... there. I noodle with the frequency sweep and output to where it was acceptable and sounded OK. Again, I was not using the best sub by a looong stretch, but it was good enough to add and fill some low end to the variety of music she'll be listening to. I/we are satisfied with those unit, but you must TAKE IT FOR WHAT IT IS. We'll see how long gnit lasts, make sure it has some decent ventilation, it does heat up a bit and might thermal protect if it can't breathe a bit.
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Reviewed in the United States on February 23, 2022 by robio5150
Model: ZK-MT21
Works well
Reviewed in the United States on December 27, 2025 by Shaey
Model: ZK-TB21
Work great and sound is quality for such a low price
Reviewed in the United States on September 27, 2025 by Nadia Gutierrez
Model: ZK-MT21
Update 1/17/2026: Suddenly stopped working. Tried to reset by unplugging. Still not working. Original review for five stars in May 2025. I assembled it and used a laptop 90w charger (20V x 4.5A) as the power supply. I am quite impressed with the sound quality; it is clean and powerful with almost no distortion even when I turned the volume up to a level that might disturb my neighbors (I live in a condo). The amplifier of my Klipsch 10" subwoofer went out. I use this 2.1 amp to power the subwoofer. In addition, it is very small. I'll update my review in a few months if my impression changes.
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Reviewed in the United States on April 1, 2025 by L.H.
Model: ZK-TB21
No pensé que esta cosa trabajara tan bien
Reviewed in the United States on February 5, 2026 by josenoel tercero