This isn't likely to be DIY, but anyway:
I have an iPod docking station: a Sony SRS-GU10iP.
I'm very surprised and disappointed to say this of a Sony product, but it's crap! The sound is very, VERY bassy. Ironically it has a Bass Boost on it, but with that turned off, the sound is boomy/thuddy to the point where I can hardly make out the words on some tracks.
[ Although I'm shall-we-say "past 40", this isn't the old "affliction of the old" thing: my hearing is absolutely fine on all our other audio equipment(s). ]In addition to its lousy, boom-box-type sound quality, controls on the thing are minimal, and obviously there are no treble or bass controls. Is there any way to get inside such an item and make manual adjustments to the treble/bass?
Cheers John