Mini Amplifier Board Bluetooth Amplifier 2.0 2X100W 5V-24V Audio Power Amplifier Module for Store Home Theater Speakers (ZK-1002L)

Very large sound from a small board. Almost lossless distortion. I had another set up on the bench for an mini in-dash BT/FM/Aux receiver/amplifier, so I just needed to swap in the speaker leads and the power supply. Used my variable voltage supply at 12V-2A. Connected to a pair of 3" full range (60-20k), 90 db sensitivity, 4 ohm speakers, 40W (specs call for 50-100W input). No noise issues at all (others that reported this likely misconnected the amp/speakers). Bluetooth sourced from my Fire tablet, found the device in seconds. Volume set on max on tablet, then tried various volume levels on the amp, including full out on Classic Metal on Slacker (I know, LiveXLive), no distortion discernable. Speaker specs recommend a passive radiator for improved bass, this was just a free air test. Played on Piano Jazz on Slacker, awesome sound.I really like the switched pot they used for volume - simply on-off and volume operation. Only thing I saw on initial test was the volume seemed to go out well before Off position, likely due to the pot value used, I'd give it a 4.5 for that....otherwise a 5 overall. I have a few 24V power and torroidal transformaers I may try for a permanent power source. This may end up a desktop or portable bluetooth speaker

Works as advertised and very simple to set up. When I had questions, they replied very quickly.

I would have never guessed such a small little AMP could put out so much power and still sound great. I am using it to drive 2 Klipsch 8” bookshelf speakers and there is plenty of clean crisp sound thats just as good as my high end Denon amplifier.It is very small (about 2x2x3/4”) and simple. Power and 2 sets speaker leads out. Power button with a little blue LED tells you its on and a 1.5” volume wheel on top. Quickly and easily connected to my phone via Bluetooth 5.2 and I could not hear any perceptible lag or signal dropout. I also own the non Bluetooth Aux/USB input version of this little amp and I am extremely pleased with bothIt does get a bit hot after a few minutes if you drive it hard bit not so much to be a fire hazard.It is important to choose a good power supply. Its spec states it will work with anything from 12V 1A up to 24V 5A which is what I am using and is probably overkill for my situation. The higher the volt/amp rating the louder/bigger speakers it will drive and still sound good, but like many situations the law of diminishing returns applies as much here as it does in most circumstances. Im sure if I experimented I could finder a lower rated power supply to drive my speakers and it wouldn't run as hot.

Currently using with a 12V, 40A, 100% duty cycle power supply to drive some 6 ohm bookshelf speakers.If the specs are to be believed, this little board is supposed to be able to pump out 12W per channel at 12V with 8 ohm speakers so, my best estimate is that it should be able to provide about 15W per channel in my configuration.To be honest, I'm not sure I'm getting that kind of volume but, other than that, this thing is great.Sound fidelity is amazing for what this is. The BT connection tone is pleasant and not overly loud. Connectivity is good and I absolutely love the analog style volume control with off switch. The noise to signal ratio is really good (no hissing or popping).

The ammount of power these little amps put out is amazing. Built job site speakers using them and old drill boxes and speakers they're loud and cheap

The media could not be loaded. Super tiny and unexpectedly powerful. Just what I needed to restore/reconstruct a dead JBL Xtreme 3. I definitely recommend this little beast.

I have it hooked up to 2 4” speakers from a boss audio motorcycle kit that I didn’t have an amp for. The Bluetooth pairs within 3 seconds of it being powered on and the volume is so loud that it hurts my ears at full tilt. It is pretty fragile as it’s a small electrical board but I’m going to make a waterproof enclosure for it. There is zero distortion and I’m only using 15 volts at 1.5 amps. The fancy motorcycle amps usually cost around $80 and don’t sound this good.

The sound quality is alright. (Not great; there's hiss at full volume; heavy bass is distorted; but at low volumes it's kind of OK.)But I found a huge bug in its functionality.When no audio is sent for several seconds, the thing apparently enters some kind of sleep mode. When audio is then sent to the device while sleeping, it does not instantly wake up, but only wakes up after about a second. That means there is a gap during which audio is not played at all.So if you connect this amplifier to a computer that makes a tone for incoming messages or notifications, and the tone is only ~1 second long, the amplifier will not play the notifications! The amp sleeps through the notifications!This is a disaster rendering the device useless when receiving notifications is important.If you just want to play music, I guess it's not horrible, but you still will miss the first second of the music sometimes.I give one star, since at any price I just can't use this. I guess I'll try to return it.