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How to Select the Audio Input Mode
This amplifier board has three input modes: Bluetooth, 3.5mm AUX and USB Flash Drives.
When both modes input audio signals at the same time, the amplifier board will give priority to the Bluetooth mode;
If you need to use the AUX mode, please make sure that the Bluetooth connection is disconnected.
ZK-HT21 Bluetooth Amplifier Board
- CHIP:TDA7498E
- BT Version : 5.0 (No shielding, 49 FEET)
- Channel : 2.1(R & L+ Subwoofer)
- INPUT MODE:Bluetooth / AUX / USB Flash Drives
- Adaptive power supply :DC 15~36 V (Under voltage protection below 9V, and 12V power supply can also be supported)
- Adapter Speaker :30-200W 4-8Ω
- Protection Mechanism : Anti reverse connection, undervoltage, overheating, overcurrent, short circuit protection.
NOTE
- Only when the audio input is sufficient and the power supply voltage/current input is sufficient, can there be enough power output.
- The higher the power supply voltage, the greater the output power;
- The smaller the impedance of the speaker, the greater the output power. It is recommended to use a 4Ω speaker.
- Finally, please make sure that the power of the adapted power supply is greater than the actual working power of the AMP to ensure the maximum output power.
- lt is recommended to use a power supply of DC 15-36V, 5A or more, and the speaker power is Left and right channels ≤160W, Subwoofer≤220W for the best effect!
Independent Control of Treble and Bass
The bass audio and volume can be adjusted separately, and with the left and right channel speakers, the 2.1 channel brings you a richer sound experience.
Dual TDA7498E Amplifier IC
It adopts a Class D amplifier design with low distortion and low noise characteristics, which can provide high power output while maintaining high-fidelity audio quality.
Large Cooling Fan
The extra-large cooling fan can provide good heat dissipation for the AMP's continuous high-power output, ensuring stable sound quality output.
Warm Reminder:
- The power switch on the board is a standby switch. After the switch is turned off, the machine is in a low-power standby state. To completely turn off the power or unplug it for a long time, you can unplug the DC plug on the machine.
- Properly increasing the voltage or reducing the speaker impedance can effectively increase the output power.
Packing Include:
- Power Amplifier Board * 1
- Protective Shell * 1 Set
- DC Plug * 1
- Screwdriver * 1
- Knob * 5
Rikki Rocktrap
2025-09-04 19:12:59
I’m impressed with this little amp board kit. The only gripe I’d have is the little fan barely making noise but that’s nit picking because it’s whisper quiet.Back to positive feedback.1: Driving retro JBL speakers from the 80s with 5 1/2 inch drivers. 150w 8ohm. Sound perfect.2: Bluetooth links with Apple TV4k. Flawlessly3: Driving 2 40w exciters with 1 50w shaker from sub channel. (Have to turn down gain and volume still).4: Links to iPhone flawlessly.5: Sub channel has separate volume and gain.6: bass and treble have separate gain.7: Volume control.8: Quality heat sink.9: Plenty of power to drive power hungry 80s speakers.10: Tiny footprint with plenty of undistorted sound coming from speakers.11: Quality capacitor array.I’m honestly impressed. My recliner rock and rolls and I’m only using 16vdc @4Ah and I could add 1 more bass shaker easily. If I turned up the gain and volume on the sub channel I’d blow up chair.
Andy
2025-09-01 12:26:13
Thoroughly impressed! When I first purchased this there weren’t many reviews. I took a chance and I’ve got to say it’s been an outstanding purchase. I hooked it up to some Bose speakers an active pioneer subwoofer I had in the garage. This board can push some power into these speakers and sub!The key is to have a higher voltage power supply. I tired it with a 15v, it wasn’t enough. Bumped it to the 32v and I was jamming!It’s small and easy to assemble. Doesn’t take up too much real estate. I just can’t believe this little board can put out the power it does. The BT works perfectly fine. Very happy!
Austin Barrett
2025-08-22 16:27:46
I have an old farm truck that didn’t have a stereo so I bought this to put in it. I run 4 speakers (two speakers per channel) wired appropriately and a 10†subwoofer. It’s running on 20v through a 12v-20v step up. Super loud. Bass from the subwoofer is pretty powerful for how small this thing is. Sound quality is clear and overall pretty decent. The reason for 4 stars is because the “frequency†knob that is used to adjust the pitch of the subwoofer doesn’t seem to do anything. I have used other amplifiers like this one before and that knob does create a minor but noticeable change in the sound of the subwoofer. Not really that important though and works great otherwise.
Negative459
2025-08-06 16:32:30
I own a lot of chip amps and this is the highest power one that I've picked up so far. If you've used any other TDA chip boards then you know what you're getting into. Sound quality is pretty exceptional for what you're paying, and the power output when properly spec'd is outstanding. I am using this one for a homegrown portable column array + subwoofer event speaker setup. I have hooked this up to a regulated bench supply set at 36v and run it with speakers wired to take the full rated WPC power at 4 ohm loads. It goes to ridiculous volume levels with no audible distortion and draws far fewer amps than the spec sheets and PSU requirements would suggest. I think I saw a peak of less than 4 amps of draw, whereas I was expecting twice that or more. The unit runs cool, especially with the fan running. The fan is very quiet, too. You won't hear it at all in a public venue. Heck, you can barely hear it in a quiet room.I am not sure if the variable crossover is just a low pass for the sub, or if it is a high pass for the stereo pair as well, but I make passive crossovers for my speakers so I haven't worried about it nor tested the output with an oscilloscope either.Anyway, this is a cheap, clean and powerful little amplifier if you load and power it properly. I would highly recommend it.
Consumer X
2025-07-24 11:20:33
You get to assemble - super easy - and it is ready to go. Full switching power supply or even a prefab - 12/24/36v 5amps or more. Running 4 speakers (4 ohm 75w RMS) and a beefy sub. It thumps, and I’d def buy again (and I did, as I have 2 of them now).
quipstad
2025-06-09 10:26:25
For an amplifier, it's a great price point and has great output power. Fan is a little loud, but I unplugged the fan and it stays cool when not driven hard (running at 19V).BT audio processing time is a bit frustrating. Unlike most of my other bluetooth audio devices, there is a delay. While it's not significant, it's enough to drive you crazy when watching a video of someone speaking (slow speaking is not as problematic). For music however, or any other source that does not require audio and video to be perfectly synced, it's fine. Aux input does not have this delay, only bluetooth.UPDATE: Changed from 4 stars to 3, due to what seems to be an input threshold required to output sound via bluetooth (kind of like a a subwoofer amp that turns on/off automatically when it detects input). Listening to some classical music, I noticed it cutting out between notes. Tested on two different devices (phone and laptop) the same piece sounds perfect via aux input, but the quietest parts are missing when playing via bluetooth. As a note fades toward silence, it suddenly cuts the output completely, and restores output just AFTER the next note starts. This is a MAJOR flaw that means I'll be using a separate bluetooth adapter for this amp, rendering all onboard bluetooth functions useless.
Technology Specialists USA
2025-06-06 17:21:14
Powered with a 24v 6A power supply and connected to a pair of 8" ceiling speakers and an 8" passive sub. All 8 Ohm speakers. It worked great for the first 30 minutes or so then I noticed that the bass was gone and the speakers sound distorted. I checked the power supply it was fine. I unplugged it for 5 minutes. Plugged again, the sound quality improved a little bit then 5 minutes later, it got worse than the first time. Now you can barely hear the speakers. What a waste of my time and energy. I tried to contact support, so far no response.
Supertech
2025-05-07 18:58:03
Compact, great sounding, price and looks, I've purchased several of these 2.1 Amplifiers for my Prototype portable Bluetooth Speaker Systems and with quality Speakers Drivers and crossovers I use in all my homemade Electronics, like the one pictured it's my Prototype 32,I will continue to purchase this model Amplifier and other models from the same manufacturer, therefore an easy 5 star review.
Joel vasquez maya
2025-04-24 21:56:39
Tiene. Un buen sonido. De calidad.En un dispositivo pequeño. Ay. Un gran. Equipo de audio execelente
Cortes
2025-04-21 17:50:20
Es un producto de prestaciones para mi gusto excelentes ya que cuenta con bluetoth lo que es practico si levanta bien un set de medios focal Expert PS 165v1 y un subwoofer Alpine de 12 pulgadas sin duda lo recomiendo
Excelente sonido muy buenos bajos
2025-03-12 13:34:43
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Danyel luna
2025-02-18 10:58:32
El sonido es bastante bueno.... Para un amplificador tan pequeño.Bastante resistente en cuanto el voltaje.Muy bueno por calidad y precio...Lo recomiendo mucho si empiezan en el mundo del audio
David Garza
2025-01-07 12:48:14
Superó todas mis expectativas!!!Lo estoy usando con una fuente conmutada de 36v/11ampEsta moviendo 2 JBL Northridge e10 y un subwoofer JBL de 10" pega durisimo!!
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