Copper Sleeve over IEC

Guys,

I tried this also and noticed a deeper and quieter background. Done the pre also but thought is was better without the sleeves. Will try on my dac when it comes in since digital appears to have alot of grunge.

I suspect that with shielded and charged powercords, such as those by Synergistic Research, you get no improvement. At least I got nothing doing this.

What about at the receptacle on the wall ? If the shielding works at the equipment end, why doesn't it work at the wall outlet end.
I haven't read every post so this may have been addressed already.

Well, I've tried it and it took the body out of the music.
The airy openess is do to the fact that it thined out the notes from top to bottom.
I used it on just the CD players IEC and it was like going from a lush tube to a bright tube. Not quite as dramatic, but I had tuned my system to just left of neutral with just the right amount of body and this took it to pure neutral with a thinning of the body.
My room is nicely treated and I can hear very subtle differences. If my system was just a bit warmer and I was trying to get it closer to neutral, then it would really be a cheap way of doing it.
I didn't get any more dynamics, the bass got tighter because it got leaner. I guess my system was right were I wanted it to be.
It does make a difference, but critical listening confirms it does thin out the music just a tad.

Great results using 3M Anti-Static Electronic Eqipment Cleaner spray
(Office Depot). Treat both the inside and outside of the coupler,
applying spray and wiping off well, making sure to keep contact with the body of the the unit. I also use the spray occasionally on the rack, equipment and cables. I also like 3M's Scotch Cd Laser Lens Cleaner...