These devices are not in the signal path and will not improve the sound of your system. This kind of product is a hoax. I am not exagerating. Ironically, power amps are a source of power line distortion rather than a victum of it. The power supplies in you equipement have very large capcitors and regulators that due all the filtering you need. Nobody makes gear with such a poor power supply that it is effected by irregularities on the power line. Honestly, go to WalMart and get a power strip. If it makes you feel better get one with some surge protecteres in it. Spend the money you save on good music.
