Copper Sleeve over IEC

Chrissain, Why dont you try it for yourself and then you decide?
It will cost less than $5 for one, or under $10 bucks for two.
Try 2 on your power cable to your CD player one on each end.

Rx8man, Try another copper sleeve on your didgital at the Male AC end.

Now I haven't had the time to audibly check what happens after installation but what I can report is that I use a portable AM radio tuned just off a station (to get static) and the polymer or plastic housings on IEC and male ends of my power cords are noisy and do exhibit less noise when the copper is in place. Not dead silent but less noise. I do have 1 power cord whose terminations are finished in aluminium and they are quiet even without the copper on them. One of my cords must not be insulated (its a 3 wire braided cord) which is noisy all along the cord itself so I don't think having copper over the ends will do much but I may be wrong.

While not yet proven by myself my opinion is that this tweak may be most effective on insulated power cords.

Rgd. Actually I'm thinking that the copper sleeve at the ends is the only place shielding is important.
If you can eliminate the nasties going into your components they will have less garbage to work with.

First off let me say I have no electrical background and I am not DIY (soldering and the like) kind of guy either so my thoughts are worth what you are paying for them...

I can see how the copper sleeve could stop airborne nasties from entering in at the IEC opening but a noisy cord like the one I have when the copper sleeve is in place isn't necessarily stopping anything from entering. It may only be acting as a shield on outbound noise from being detected. The noise traveling along the cable may be going right into the unit and the noise is less audible at the copper sleeve because its blocking it from coming out. It may still be blocking anything more from going in (which is a good thing) but it isn't necessarily blocking this noise from going into the unit. Something that may block something from entering may be just as effective blocking something from coming out as well. I still think insulated cords may be the best cord to use this tweak on.

Well thats the extent of my technical BS and I defer this to people more knowledgeable in these matters...