it's an average 2" fullrange speaker i snatched of a portable mp3 player. i hot glued it and wired it in series with the OG speaker... Back in 2013 I did what you suggested - had a portable speaker with it's own amp in there but I went back to the OG amp because I had so many electric consumers in there that the pt01 got overloaded... there is so many cool shit you can do without needing any power... line faders, cue-option, ashtray...