These are a couple passive phone speaker amplifiers designed around the Galaxy S5. One for my oldest son, one for my wife, and one for me. Most music sounds pretty good on them, but heavier alternative type music definately has some distortion. If I make any more, I’ll try to smooth out the channel and make a more open chamber to see if that helps. If anyone has made any of these, and has some tips on getting cleaner sound, please let me know!
Thanks for looking, and have a great day!