Copper Sleeve over IEC

I have placed the copper union piece at the MarantzSA-11S1 cd player, at the Art Audio Px-25, and at the IEC connection of my PS Audio Premier Power Regenerator. I noticed good results. There is a on going good discussion at the Tweek forum of Audio Asylum of using copper and how it works.. Carbon Fiber Tubes may also work to good effect.
If you buy the copper pieces at Lowes or Home Depoit you can return them for a refund. Cost is about $4.50 each

Remember when trying the copper too much can be a bad thing. It improved my Marantz SA-11S1 using copper at both ends. For my Art Audio Px-25 amp, copper helped at the IEC end but additional copper at the male end collapsed the sound stage. Both cords go to a PS Audio Power regenerator and not directly to the wall. I bet it will help most CD players as they generate a lot of noise to the A/C line. I think the improvement to amps will vary.
Have fun experimenting.
David Pritchard

I have looked at the forum site where this tweak was first reported. I was interested in the idea of outlet cover material improving the sound. From what I read, brass outlet covers did not make a difference, but carbon fiber added to a plastic cover or the expensive commercial covers did make a small improvement.
David Pritchard