Power Conditioner deleterious to digital sources?

I bought a power conditioner (meant for for the manufacture of chips, where stable voltage and absence of AC hash, and DC leakage from the mains is mandatory). I tried plugging in both pre-amplifier and CDP into it, and it was awful: the sound took on a compressed, walkman-like, sound. Soundstage was all gone, replaced by a muffled signature. I removed the pre-amp from it, and much of the magic is back.

My question is: do power conditioners generally help digital sources?
Maybe I need to ProGold5 the contacts or something.

Thank you...

benny