DROK Class AB Amplifier, 2.1 Channel 80W+80W Stereo and120W Pure Bass 9-18V 4Ω Audio Amplifier Board

I ordered 2 of these, 1 spare, to replace 2 Class-D digital amplifiers. The Class-D amps had very poor bass response and and sounded too bright on the mids and highs. It also required a 24 volt supply, which meat a separate 12V regulator for the VU meter circuit. This item took their places with no changes to the preamp at all (the preamp was tested separately for frequency response after I noticed the lack of bass). The change in the sound was night and day, with the full spectrum being reproduced. This is on good quality KLH speakers and connected to the line out on my computer. The bass is deep and tight. the bass drums have punch, yet the foot pedal notes from an organ are there also.I highly recommend this amp!

This is a really nice amplifier board, and I've tried a few. This review specifically pertains to the model being listed here, "Class AB Amplifier, DROK 2.1 Channel 80W+80W Stereo and120W Pure Bass 9-18V 4Ω Audio Amplifier Board". Some of the older reviews appear to be talking about a totally different product. This one does not have bluetooth.Honestly the sound quality from this thing is outstanding, it's clean and loud and music sounds fantastic. K have it hooked up to an ATX power supply that I use for my car audio equipment at home, pushing 12v through a fused distribution block. The input is a 3.5mm aux connection to my Galaxy S22 USB-C out, converted through an in-line DAC.Upon initial turn-on, a nice green LED lit up,and there is no noise whatsoever coming out of my 6.5 inch coax speakers. No buzz,no fuzz, no hiss, and no piss. A beautiful thing go experience if you've been let down by some of these mini amplifier boards previously like i have.I also hooked up the subwoofer output to my 10 inch sealed Infinity REF sub at 2 ohms. The balance is unbelievable! There's only one volume control know, so there is no way to modulate the sub or speakers independently, they're just mixed on the board, but the mix is super nice and balanced.Overall I'm super happy with this amp. It aounds better than other amps that cost multiples of what this one cost me ($23). I recommend it without reservation, just make sure you know what you're doing and have the 12v equipment needed for running this in your setup.Kinda wish it had bluetooth but I knew it wouldn't going into it so that's not an actual knock on the product. Just a wish.Good luck and enjoy. This thing puts out loud clean clear audio signals for your speakers!!

Interesting little board for the DIY / hobbyist crowd. It uses a ST TDA7850 chip intended for 4 channel automotive applications. The subwoofer implementation is pretty straightforward, although it should be noted that the subwoofer uses only one of the chip's amplifier sections, it's not 2 sections bridged as you might assume from the advertised specs. Look up the ST TDA7850 datasheet for more realistic specs.Despite the specsmanship, I found this to be a nice alternative to all the Class-D boards out there. I measured about 60W into 4ohms at clip with a 15V supply, impressive for the price. Sound quality is about what you would expect. It's obviously not going in any audiophile systems but would be right at home in desktop A/V applications.

I can hear voices through my subwoofer using this, you will want a low pass filter to go with this.

I designed this enclosure to reflect the old model T Ford “hot-rods”.The heat sink fins are left exposed to maximize cooling for the power transistors.The circuit is well designed and the board is robust. The sound is clean and warm —characteristic of its class of amplifiers. I am powering it with Ryobi 18 volt lithium batteries, allowing me to use it for portable applications and during power failures at home.I am making it the center of a high-fidelity “boom-box” using a bluetooth receiver for both music and movie sound in conjunction with a tablet computer, with speakers that are detachable — when such separation is desired for improved spatial sonic imaging.I like this amplifier a lot, and am very pleased with my purchase.

Warm and true audio out of this one!!! The sound is the true nature of an AB class amp! This tops other board amps of this size by far! Most people’s opinion on what classifies a good amp is just how loud it gets or how much bass u can get out of it. With this one I only cared about the tone and fidelity for mixing without any colouring of the sound and it does this perfectly. I did get the 2.1 channel one but haven’t connected any sub. It gets plenty loud enough for anything I’d need it for without distortion. The caps did come banged up on the top and I wasn’t too happy about that but it still works and I even purchased spare caps to swap them if needs be. I highly recommend this one if your priority is pure sound quality

I haven't got it installed in a project yet, but provided it works it is an excellent little amp. Very tidy build, nice circuit layout, no jumpers, clean solder job, good components, and nice fit-finish. Make a good sub amp. Amazon has an amazingly good variety of these amps. A "goto" destination.

The left and right channels are wired together. This doesn't sound great with aux and actually breaks some dac inputs.