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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Extended holiday returns
FREE refund/replacement until Jan 31, 2026 Learn more
FREE refund/replacement until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026
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Availability:
In Stock.
Arrives
Saturday, Dec 20
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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: #24,172 in Electronics (See Top 100 in Electronics) #116 in Audio Component Amplifiers
#116 in Audio Component Amplifiers:
Customer Reviews: 4.3 4.3 out of 5 stars 450 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Dec 20
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
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-TB21
Really good I just need to get a better power cord
Reviewed in the United States on November 6, 2025 by Aiden richards
Model: ZK-TB21
Suena bien pero no es muy potente en volumen, para el precio que tiene esta bien para tener como opción de sonido en pc o música en la habitación.
Reviewed in the United States on October 21, 2025 by Raul Yazawa
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-TB21
Muy bueno para el precio
Reviewed in the United States on September 29, 2025 by Alfredo Ortiz
Model: ZK-MT21
Cons: - Burnt out within 3 months of infrequent use and started arcing near headphone input. - Manufacturer sheet states that 4ohm speakers should be used with at most a 12V power supply. This was not mentioned in the sale listing - Thermal paste on chip / heat fin was fully dry, probably want to repaste if you plan to use this at loud volumes - despite tightening down the wires to the power adapter, the wires pulled out fairly easily and started arcing. I tinned the wires after to make them less likely to pull out. - tinned speaker wires are difficult to insert into the place to screw them down. I had to reshape / flatten them with pliers so they would fit. - notable buzzing at louder volumes - Bluetooth doesn't require pairing. Bluetooth takes a priority over wired input. Any of your neighbors could connect and just start playing their music through your system. I don't expect it to be a problem in practice, but it's still not great if you plan to run the amp in wired-only mode. Pros: - powers speakers with more power than my USB DAC
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Reviewed in the United States on October 12, 2023 by Allen Millington
Model: ZK-TB21
Muy buena calidad en los medios y altos. Excelente producto
Reviewed in the United States on September 13, 2025 by Nahomis
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