I have a surplus headset from the Navy, at first I tried re-wiring it, but as mentioned, the hardware wasn't meant to reproduce anything except voice. Everyting was very "tinny" sounding. So I ripped out the hardware, and dropped in the speakers from an old headset (from my walkman no less lol) took apart my PC mic, and rigged it in place (had to cut a hole in the plastic casing to get good sound though).
you might ask: "Why the hell did you go through all that trouble Sikboy?" Well, I couldn't get the mic-arm on my PC headset to stay in place. Now I don't have that problem.
I'm pleased with the result, but it was mostly worth it because I had all the parts laying around the house.
-Sik