Check out these autoformers before changing your hardware.
http://otlamp.com/tweaks/ps/zero/index.html
Installing these in my system changed very poor bass performance into very good bass performance. I am not sure what they can do for your friend's system though. They cost just shy of $400, but can replace your speaker cable if amp is close enough.
http://otlamp.com/tweaks/ps/zero/index.html
Installing these in my system changed very poor bass performance into very good bass performance. I am not sure what they can do for your friend's system though. They cost just shy of $400, but can replace your speaker cable if amp is close enough.