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ZK-MT21 Bluetooth power amplifier board parameters
- Model: ZK-MT21
- Bluetooth Version: 5.0 (Without occlusion 49 Feet)
- Audio Input: AUX + Bluetooth
- Channel: 2.1 Stereo
- Adaption Supply Voltage: 12-24V / 5A above
- Speaker: 20-100W, 4-8Ohm
- Output Power: max 50W R&L channel; max 100W subwoofer
- Protection Mechanism: Anti reverse connection, overheating, overcurrent, short circuit protection
NOTE:
Please note that this product does not include a power supply, you need to equip it with a DC power supply.
It is recommended to use a DC power supply within 20V. If you use a battery pack to supply power, make sure that the battery voltage is lower than the rated voltage when the battery is fully charged.
Independent Treble & Bass Control
Comes with independent treble and bass control so you have more sound choices. A small power amplifier can also create a small movie theater for you. If you give it enough energy, with a 5-inch-6.5-inch speaker, it can give you a value-for-money experience.
High compatibility and versatility
1. In addition to the Bluetooth input method, this power amplifier board can also input audio through AUX, and all 3.5mm AUX cables on the market can be used;
2. Regardless of whether your speaker cable has wiring terminals, it can be quickly and conveniently connected to the ZK-MT21 power amplifier board;
3. The universal 5.5mm*2.1mm DC power interface can be compatible with most of the DC power adapters on the market. Of course, this product also comes with a DC adapter to solve your worries about not having a 5.5mm*2.1mm plug.
Additional base for Bluetooth antenna
As some customers need additional Bluetooth antennas, we reserve a Bluetooth antenna base for customers,
Under normal circumstances, you do not need to add an additional Bluetooth antenna for it, only when you install the power amplifier board in a closed metal box, you need to add an additional Bluetooth antenna.
Renato Gonçalves
Reviewed in Brazil on March 29, 2025
Excelente produto.
David Wolf
Reviewed in the United States on April 25, 2025
This is a great replacement for when your audio amplifier blows up
angel rivera
Reviewed in the United States on April 21, 2025
This is one of the best amps for the price , is good that can handle from 12 to 24 volts and it makes the DIY speakers sound great , because is 3 ch 2 for the mids and one for the sub .
L.H.
Reviewed in the United States on April 1, 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.
Joe Bassel
Reviewed in the United States on July 28, 2024
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!
Shirley V.
Reviewed in the United States on July 17, 2024
I like this little Amp, but the 3.5mm input Jack doesn't work. I've been using this amp for several weeks with bluetooth and found it very good. Now I need to add in to my Christmas display (where I need to use the wired audio input) and it doesn't work. I've checked my output and cable with another amp and they are fine. Any ideas of what might be wrong or how to proceed? Thanks for your help. Don
Dwight A. Campbell
Reviewed in the United States on January 19, 2024
This is a great little unit powering a 2.1 desktop speaker set. Sometimes it will randomly stop outputting sound. Once the unit is powered down and back up again, it works great. I am not sure if this is a design flaw, but I am using it with a 12V power supply, just as the manual suggested. Other than that frustration, this is a great little amp.
@ngehead
Reviewed in the United States on August 26, 2023
My husband's review:I’m very pleased to give this Bluetooth amp 5 stars. It’s well labeled, installation was easy and the Bluetooth was immediately discoverable on my iphone. It played music loud, right away. I am delighted! -and this on the 12volt installation, can’t wait to amp it up to 24volt& try its power :)Great product, I recommend!
MFS
Reviewed in the United States on March 27, 2023
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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