TPA3116D2 TPA3116 XH-M543 Dual Channel Stereo High Power Digital Audio Power Amplifier Board 120W+120W DIY Module

This is a clone of a popular class D digital amplifier. You can find lots of very technical reviews with the model number, XH-M543.This particular version seems well put together. The solder doesn't look sloppy and I don't notice any scratchy noises or non-functioning channels running it through some minor tests @ 12v.There are two pots on the board, next to the audio input header. The two pots are labeled volume as if you could attach knobs there. Those are not real volume controls. They're are no knobs in standard electronics for those kinds of pots. They are gains, and they can't be turned into knobs because they work best as set and forget forever. For the voltage you provide, use a precision flat screwdriver to turn the gain up all the way so long as there is no clipping. Leave it there. The volume should be controlled by the source material, not those knobs.

These are good little DIY amplifier boards, this one is more targeted towards mounting internally and running the cable to a potentiometer, wiring up all the inputs/outputs to through fittings on the speaker. You can use it externally on it's own but I don't think that is it's intended use.120w per channel seems a little hopeful, these are usually 50 watts per channel when running a 24v input, 40 watts at 19v input, and 20-25 watts per channel at 12v input. A true 50 watts per channel will make 4" bookshelf speakers absolutely scream, half volume will be overly loud, you'll be surprised at how much speaker these can run with the right power supply.