ZK-HT21 TDA7498E Bluetooth Amplifier Board 160W×2+220W Subwoofer 2.1 Channel Audio Receiver Power Amplifier Module with Treble and Bass Control for DIY Speakers

This amp provides a lot of bang for your buck! You havento do a little minor assembly, which I wasn't expecting, but it's simple and a screw driver is provided. I'm powering it with a 20v DeWalt tool battery to drive no less than seven speakers in a custom enclosure - 1ea 10" Klipsch sub, 2ea 10" Ashdown mid/woofers and 2 pairs of 2.5" Klipsch high frequency drivers with 1" poly dome tweeters. And it effing rocks! After pairing it in my phone, the Bluetooth connects quickly every time I power the rig up. The fidelity is excellent. Crisp highs, detailed mids and plenty of power to drive the sub, especially with the sun frequency set higher. At lower settings where it rolls off more mid-lows its power does drop off, but, with a tiny plate amp like this that's to be expected. I'm honestly blown away with how much bass thin amp can produce. With more use I will have more info on longevity (and battery life, but,that's not related to this review). Well worth the money for what you get!!

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.

I'm seriously impressed with the sound quality this amp produces. I purchased the zt21 about a month prior to this one. But the zt21 kept popping while playing music. Thought it was capacitor so swapped it out but still the same issue. Then I noticed if I blew on the heat sink when it started to pop, it would stop. Placing a fan on top solved the problem. So that's why I chose the HT21, because of the built in fan, but was surprised at how much cleaner it sounds. And the knobs to control the Frequency, Bass, Treble, and Volume are much more accurate & smoother than the zt21. Bluetooth sound quality is significantly better as well. I use a 24V 5A LED Driver power supply for good clean power, but I also use ~ 30V high amp 18650 lithium battery packs I make, when I want my system to be portable. Overall, this is a much better amp than the zt21, it may be more expensive, but well worth the price. Just remember to use a good quality power supply or battery pack for a nice clean sound. This one can take up to 36V/ ~10-12 Amps I believe.

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. Flawlessly 3: 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.

My son purchased this for his boombox hes making with his dad! Really good quality! Installation is easy ! Straight forward

Powers a Planet Audio 4 ohm, 8 inch sub, and 2 Rockville 6 1/2 inch bookshelf speakers with ease. This amp is loud through 4 ohm speakers. The 3 flaws I find annoying are the tiny, and I mean tiny terminals. 12 gauge wire struggles to find room enough for a secure connection. The aux power connection pulls free easily, there seem to be no positive lock or latch on the connector. The amp 'pops' when Bluetooth is in use and input is signal volume is low. When signal volume increases, there is a 'pop' as the sound comes back up. 3/3/25 Update: Dumping power supply maximum current into L/R speaker out without any input signal. Burned up 2 4 inch Skar speakers.

ive used a lot of the parts express TPA3116(they sound great but lack the power) boards for BT speakers and had a customer who wanted a bigger beast. I built an enclosure for a 10" sub and dual 6.5" woofer 1.125" tweeter combo highs crossed at 3k. i was expecting a lot from the setup with the sub tuned to 28hz. so much of the lower frequency is removed from the subwoofer section of the amp i was extremely disappointed. I can tell you the power output is respectable. for the price I really cant complain too much. I just wanted all the beans and didn't get em. still made for a bad ass BT build. If you know HiFi you will be disappointed but it will impress the novice. I would give 5 stars if it didn't cut the low end of the frequency spectrum. It sucks when you tune for something and don't get it(unless i did something wrong).

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.

Best product

Tiene. Un buen sonido. De calidad. En un dispositivo pequeño. Ay. Un gran. Equipo de audio execelente

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

Cumple con todas sus funciones facil de instalar lo recomiendo

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