Copper Sleeve over IEC

Thanks. Sounds intriguing. Certainly inexpensive enough to give it a try. I'll let you know how it works on my Bryston BCD1.

I've tried the Stillpoints ERS cloth wrapped around various IEC's in my equipment, serves same function. Sometimes beneficial, other times deadens the sound, not using any in present setup.

Where's the YouTube video ?

I typed in Marantz SA-7S1 per Dr. Phil at Alcoholics Anonymous ..........

A non-ferrite ring?

Try this link for the You Tube video

http://www.youtube.com/watch?v=piPI_ByD0Q0