Copper Sleeve over IEC

This is far the cheapest way to improve your audio system and better than even switching power cords and cables.

Everything improves. Tip use two at the male end of your cd player than one at the IEC end. Zero noise, more body and micro details.

On non digital gear it is case by case. I choose to go without, but with my old audience power cords they sound much improved with one cooper union on each of the male plug ends.

This is by far one of the best bang for the buck addition I have ever used in my system.

Everyone who as tried it have said about the same thing.

You blocking noise from the outside world, now to add to that get some rca shorting plugs (not Cardas caps) use then on all unused inputs, less noise again and this is also cheap.

If you run balanced like me do not use them on the RCA jacks on the same input as the XLR.

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.