A couple of years ago I built a little TPA3122D2 amp that I found on the forum and decided to put it in a cigar box. It's a BTL config with a 15vdc wall wart PSU. All by it self it sounds as expected, pretty darn good. I added a big DC meter for the steampunk look, and a volume pot and on-off switch. Problem, the volume pot is definitely causing trouble. I tried a 50K dual pot, (see atachment). Didn't work. Sound is distorted and broken up. I guess the pot value is to high? Maybe a 1K or 5K? Not sure what the output impedance is of my laptop but will mainly be using with cell phone output. Any hints?