For a good quality sound you can try a script I made from other scrips found around here. I tested them on BeatsAudio headphones, and the sound is about ~80% identical quality as an HTC X8 with Beats Audio.

http://www.mediafire.com/?hwxl02z415uft6t (files + instructions + documentation)

And here are some screenshots:





Works with SPEAKERS (WARNING DON'T SET VOLUME TOO HIGH!), HEADPHONES, HANDSFREE, BLUETOOTH AD2P and TV-OUT.