ZK-TB21 Bluetooth 5.0 50W+50W+100W 2.1 Channel Subwoofer Amplifier Board TPA3116D2 HiFi Treble and Bass Control Stereo Digital Audio Amp Board for Home Theater 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 bought this product like 2 weeks back, this product was excellent it blown my mind. I giving this a power supply of 12v 3a still working perfect with my 30w woofer+20w tweeter 4ohm bookshelf speakers and 100w 4ohm Sony subwoofer. It has good sound quality and nice power handling. This security mechanisms works excellent. Like the auto power cut off, or else the short circuit protection and over voltage and under voltage. Everything works perfect. Ease of use, easy setup. Nice and fast Bluetooth connectivity. Great durability, I dropped it from my table still it good doesn't have a scratch on the body. Small in size fits perfect on my desk.

I have a couple of these. Bluetooth sounds better than using the cord. Use an appropriately powerful DC laptop brick or anything similar if you want the biggest sound. The one connected to my PC uses a 200w 20v DC brick to drive 4 speakers (2L and 2R in parallel) plus 2x 12in subs (also in parallel). It will shake things off the walls in my house. You won't believe the performance from such a cheap device. Pros: Easy to assemble, wire, and connect power. Bluetooth setup is simple. With the right power and speakers/sub, your neighbors will think there's an earthquake. Cons: Slight hiss if you leave the main volume knob turned up to max with nothing playing. If you're listening to something with pauses at low volume, it may not play the next spoken syllable or noise. This does not happen at medium volume or if the movie you are watching has birds chirping etc in the background. It's almost as if it goes to sleep for a fraction of a second.

Was skeptical required assembly and did not look like much, I have a Klipsec 2.1 the amp went out on and i am very impressed with the sound quality and volume of this little amp granted the speakers I am using are premium quality. Bluetooth works good hope it last for under $20 im very impressed sounds better than the THX certified amp it replaced.

I'm actually surprised that this works as well as it does. I hooked it up to the speakers in an old Samsung TV soundbar and subwoofer. I usually connect via Bluetooth from my laptop. It sounds much better than anything this cheap has a right to sound. Everything functions, the Bluetooth is reliable. I can't figure out if this is the amp, but I have to keep turning down the subwoofer, probably because the speaker I hooked it up to is cheap. Otherwise, it's loud and clear.

Actually surprised at the sound. Have it outside and it’s been rained on several times (unplugged from power). Still drives (4) 4” and a 12” sub. Great sound and surprising quality. Bass sounds great.

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 bought this for some leftover car speakers I had laying around. I can't really comment on whether it provides the advertised power, but I can say it works. I've powered it with a 24V/6A power supply via barrel jack and the 2-pin from a Ryobi 18v adapter, no issues with either. Left, Right and Sub channels all worked fine, no issues there. Connecting was simple, you turn it on and it's automatically broadcasting, connecting had no issues. But for whatever reason when using Spotify, the first few seconds of a song would just be skipped whenever the song would change. Nothing too huge, but it is still something to bring up. Some other issues were that I feel the sub control knobs were switched, where frequency was volume and volume was frequency. Again nothing crazy since I only had to adjust once, but still something. I also wish it could power itself off like the mono amp ZK-1001U instead of going into standby. I had some power switches laying around to get around that though. Overall, not bad, this was my first time buying an amp board like this so I might look around at others first, but I wouldn't feel bad if I had to buy this again.

Ficou mais barato montar o som.

Best product 👍👍👍👍👍👍👍👍👍

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

This is one of the best 2.1 channel amp. I had oneplus q2 pro 65 inch tv and the tv stopped working after a year but the tv had best sound system ever,i never saw a tv with such sound system. So basically i wanted to reuse that sound system with my new lg c4 so i took out the speakers subwoofer and the tweeters from oneplus tv but the sound system was passive and needed an external amp to drive them. I ordered couple of amps before but they were giving good sound quality. Finally i ordered this amp with seperate channel for subwoofer and it works amazing. For now I’m using it via Bluetooth and the sound quality + bass levels from subwoofer are 8.5/10. I imagine how good the quality will be via wired connection,so i have ordered DAC,digital optical audio cable,aux and i know it will sound much better via wired connection. I have checked all the 2.1 amps on amazon some good brands are above 8k and the ones under 8k aren’t good. Don’t judge this amp considering its cheap price,just buy right away. Only thing i am concerned about is its logetivity since it has no warranty. Rest i can assure you that its the best amp.

Its ok