This does bring a question to mind. Before your mods, was your acdc sound at least clear? My Metallica premium sounds so nice ask I did was add an external sub, but my acdc pro was always crackly. So I put a 12" powered sub inside the cabinet, added 40w pyle speakers in the back box, then added a 40w amp with a low level converter to it. The sound is a little better, alot louder, but still sort of crackling. I'm wondering if some of these sound boards just suck or if I simply made a bad choice with the back box amp and level converter. Any thoughts? The parts were cheap enough, but I don't want to buy more to try without at least knowing someone else had good luck with it.

I was thinking the same thing, but I needed a push in one direction or the other. I'll play with the sound card first. It was always a crackly, distorted sound, AM radio sounding. I really didn't know if that was normal, it's the only acdc I ever played and everyone says the stock speakers suck so bad.

I was pretty surprised that modern music pins have such cheap sound. I guess they have to leave us something to play with.