I use a Monster HTS2000 power conditioner with good results. I live in LA and have a very dirty power supply. It may restrict the dynamics somewhat but it is hard to tell because without it the background noise level is much higher, and there is as well a very noticable drop in detail. My system sounds better and more musical with the Monster and it was only $125.00 mail order. I also run my amp through one of the special "amp" outputs (that claim to not restrict power/dynamics) with better results than straight into the wall. I guess that it all boils down to which is the worse of two evils in your particular situation. My gear is not expensive but is also not midfi.
AC Conditioners?
Interested in a used AC Conditioner but don't know much about them. Can anyone tell me if they lose functionality as they get older? Do they where out? Do they not filter as well after protecting from some kind of surge? What are the considerations and what questions should you ask? Appreciate any info anyone can provide....