Toroidal Isolation Power Conditioner

ExactPower EP15A

Above is one such thing, no affiliation what so ever with the listing party, have had several of them, they work great.

Good listening

Peter

Cinepro, out of business, but used around $500, Power Pro20,
also made by Furman, search Ebay for balanced power.

Check out these:

http://www.surplussales.com/Transformers/IsolationXmers-3.html

Add Blue Circle, Equi=Tech, Furman and Balanced Power Technologies (BPT) to the list. With regard to such products being "top tier", there are more similarities than differences between them all. For one thing, Torus, Bryston and BPT all employ the same "LO-NO/NBT" OEM isolation transformers manufactured by Plitron Corp.

BTW, Cinepro is still in business, with a whole new lineup of products. http://www.cinepro.com/
.

I suggest reviewing the Equitech website for a significant amount of information.