Copper Sleeve over IEC

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...

while the spray is still in your hand, apply some to a clean
cloth and wipe the wall behind your speakers...
imstant energy to the sound, detail, too.

I just tried this on both ends my Shunyata Python CX from the Acoustic Revive RTP-2 to the Krell SACD Standard Mk. III. Astonishing! Much quieter and cleaner sound, nothing exaggerated, just smooth, deep, and flowing. Got the copper sleeves from Handy Tru-Value. The 1 1/2 " diameter sleeve perfectly fits the Shunyata ($5.99 each). I couldn't resist, and fitted out the Audience PowerChords on my Home Theater as well - another perfect fit (Oppo, Samsung Plasma, Emotiva Pre-Pro). Fabulous results, and no downsides. Thanks the the original poster and the early enthusiasts. Really worthwhile improvement.

I feel that this thread really needs to be revived. All I can say is wow! I came across this thread through a link in Jim Smith's quarter notes (which come with Jim Smith's Get Better Sound DVD's... which I also highly recommend). I bought a couple of the sleeves (1 1/2 " plumber unions at Menard's for about 4 and a half bucks each). I had them sitting in a bag for a couple of weeks before I thought I might just as well try one on the ICE to my Sony XA-5400es player. Well everything got better...small details that weren't there before, layer and depth to soundstage, smoother and everything has more weight and air. I now have them on both ends of cd player and one each on IEC end of PS Audio PPP and integrated amp. I am stunned at what I now hear. The whole room seems to be alive now with music. I am a big believer in tweaks as I have incorporated many in my system with very good results but this is off the scale especially considering the low low cost. I can assure you that I wasn't expecting much if anything! I almost forgot my cables are 3 Juice II power cords by Wywires. Please give it a try there's a good chance this may be the most cost effective tweak you have ever tried. I feel as if I have upgraded my speakers and cd player for less than $20.00. I also noticed that the the system plays louder than it would at the same setting on the volume conrtol on the amp than it did before.