Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W x 2+100W DC 12V-24V Audio Power Amplifier Module for DIY Bluetooth Audio and Store Home Theater with Treble and Bass Control

I bought this little amplifier, not believing it would work for the price. When I connected everything, I was shocked that it worked and produced such good sound. I recommend it!

I used this to power a 35w tactile bass shaker. Haven't used the left and right channels or the Bluetooth function, but it gives plenty of power to the 'subwoofer'. This was so much cheaper than getting a dedicated subwoofer amplifier and does the job perfectly. I'm powering it with a 12v 2amp plug I had lying around and was surprised that it managed to power it given what is written in the instructions.

So far so good

Is perfect

Did not work properly i dont like it the item was damaged

Before continuing, ignore the way it's put together in the photos for the listing, it's been assembled upside down (see the DC power going into the port labelled Aux-In, for example). The provided instructions are a poorly photocopied single sheet of A4, that don't provide any details about Bluetooth pairing and the likes, but that's fine - I only want to use a wired connection because I don't want any latency (it's for synthesisers). Fortunately it's not a hard thing to build - if you've got any sense at all you'll manage. It even comes with a terrible screwdriver to help you along the way! The entire case, which is just a top and bottom with the panel for the knobs already in place, is made from PCB material (the same as the PCB - crazy, I know!). Given the sides and back are open to the elements I guess its main purpose is to prevent fingers getting close to the heatsink. It's all quite 1980s futuristic, being black with silver for the labels! The provided knobs are also silver in colour, and just a bit too shiny for me so I'll swap them out later. All the hardware is provided, but there are no spare screws or anything which means that, if you drop one of the tiny screws, you might be in trouble. I dropped one... but I'd hoovered the workshop floor a minute beforehand so I found it very quickly. That's all my complaints done. It's actually a very capable little amplifier and can bring life back to speakers that you've had sat on the side for ages because they're too good to get rid of. For me it's using the speakers from an extremely old iPod dock - it hasn't been used since 30-pin connectors were abandoned - and it does a fine job of it. The subwoofer didn't make it but the main speakers sound good. I've not tried the Bluetooth, as explained, and I've only run it on a 12V supply because that's what I had to hand. It's a standard 5.5x2.1mm barrel jack, centre positive, and you've almost definitely got something that will power it in the house already. With better instructions, knobs and enough screws to be able to drop one without panic, it would be a five star review. As it stands, it's a good part to modify lightly for projects.

lots of disconnects. very particular to the PSU you use. very hard to use with multiple devices - impossible

A very capable amp for $16. I regularly test car audio speakers and used to have complex amplifier/power supply/wiring set up just to do so but with this simple thing, it's just plug and play and the output is stronger than a lot of tiny car audio amps costing 3 or 4 times the price. Very nice and convenient. Not sure how well the circuit protection works though. I purchased one before and accidently crossed the + and - leads on the subwoofer channel for just a split second and the amp started smoking and stopped working. Didn't return because it was my fault.

Installed this tiny powerhouse in my Polaris side by side EV UTV using some 3.5 inch coax midwoof tweeters (Orion Cobalt CB35) in the dash above the cup holders whci was the biggest speakers I could fit cleanly with custom 3D printed carbon fiber infused adapter plates. I also installed Rockville VS8K54 8" K5 800W Car Subwoofer under the driver seat (the UTV had been converted to Lithium so that space was empty now, 4 12 volt batteries on that side gone). This combination works awesomely as the adjustments to the sub frequency cross over and volume allows precision matching and provides plenty of power. I am 100% happy with this amazing little amp/bluetooth setup and would highly recommend it for someone trying to put together a decently loud, full range sound that thumps and plays clean on a wide range of music, from deep bass techno through complex melodic vocal instrumental.

I was surprisingly happy with this little guy! AWESOME bluetooth connection, Seriously ..minimal latency, no buzzing or humming or sound interference, quickly connects & provides a strong clean connection that I've tested at 35ft away outside of building while device is inside. I have not yet measure the true watts rms output yet, mainly because it honestly sounds accurate with proper power supply & wired at 4ohm for speaker/sub. Don't bother using if using a 12vdc power supply as it will distort sound, generate more heat, and stress all equipment. For clear audio with good mids crisp high and punchy lows, use 19vdc 3amp to 24vdv 6amp. very minimal heat generating from device with this power supply range, even with hours of high volume bass use. If a 2 speakers 1 sub (in this range of watts) head unit is what you're looking for, I Totally recommend this lil guy

Edit: Despite what the specs say, you CAN NOT power it with 24v. Emailed the seller, they said over voltage protection kicks in over 22. I had a 19v power supply. It did increase the power, but anything over 12v causes background noise. Power it with 12v and it’s a mid-80db amp in my 12x18 cabin that sounds great and it’s $17. DUDE!!!! I’ve owned a Rotel, Harmon Kardon, and used to build award winning car stereos, when it wasn’t just about SPL. I wanted one with the TPA3255 chip, but they were delayed in shipping. I bought this as a stop-gap. DUDE!!! I paired it with Paradigm Micros and a Polk sub box that the amp transformer had shorted out in. It took some playing with it, BUT IT IS AWESOME!!!! First night, I ordered a 24v power source and cancelled my order for the bigger one! I live off-grid, and being able to have a bad ass stereo running straight DC off the batteries was my goal. I can’t even believe it’s a $17 amp board!!! It sounds so good, there are some of my CD’s I won’t listen to on it because it reveals the garbage production quality! It sounds better than the Douk I bought with the 3255, honestly! It’s crazy!!!