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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Availability:
In Stock.
Arrives
Thursday, Oct 30
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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)
Is Discontinued By Manufacturer : No
Product Dimensions : 4.37 x 4.05 x 1.02 inches; 4.59 ounces
Item model number : ZK-MT21
Date First Available : September 30, 2021
Manufacturer : DAJUNGUO
Best Sellers Rank: #13,634 in Electronics (See Top 100 in Electronics) #59 in Audio Component Amplifiers
#59 in Audio Component Amplifiers:
Customer Reviews: 4.4 4.4 out of 5 stars 416 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Oct 30
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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 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 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
The media could not be loaded. Works great , my only complaint is there was no instructions on how to assemble it
Reviewed in the United States on September 16, 2025 by Chase covey Chase covey
Model: ZK-MT21
Loud and clear! And powers the speakers very well
Reviewed in the United States on July 17, 2025 by David M.
Model: ZK-MT21
The media could not be loaded. sounds soo good but if you want to run big subs your gonna need a powerful power supply but other then that its great i’ve bought 2
Reviewed in the United States on August 16, 2025 by Pedro Ruiz
Model: ZK-MT21
This is a great replacement for when your audio amplifier blows up
Reviewed in the United States on April 25, 2025 by David Wolf
Model: ZK-MT21
It works well, but expect the big input power capacitor blew if you're using a 24V supply, which it's supposed to be rated for. The capacitor is only rated for 25V, which isn't enough in this case, and when blown it shorted the power supply. Haven't had issues after replacing it with a better suited capacitor, but it does get a bit toasty.
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Reviewed in the United States on September 1, 2025 by FelipeL
Model: ZK-MT21
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.