From Rf_gumby: I've only heard a few times that conditioners made the sound better
When I added my power conditioner to my AV setup I noticed an amazing difference to the picture quality and the bass tightend up considerably
When I added one to my hi-fi I noticed much better all around sound - but - I'm still not sure if it is the effect of the conditioning - or the fact that the outlets on the conditioner make a much tighter contact with the plug than than what I had previously been using
I did compare:
1. the amp plugged into the conditioner as opposed to
2. the amp plugged into the wall outlet
and could not detect any audible difference - in both cases Furutech power cable was used
The biggest difference I have found is replacing the wall outlet with hospital/Lab Grade outlets