Copper Sleeve over IEC

This tweak works great on my friend's system. Great improved on audio. We tested on DVD mode using his Bob Scacces disk, but there's 1 technical problem. After the 2nd attemped, audio still playing but the video went blank (showing no input) everytime we slided the copper over his IEC (Nordost) even on diff DVD disks.
His DVD player is Ayre D1-xe comes with original equipted seperate power supply. http://www.ayre.com/retired_detail.cfm?productid=4&field=specs
The video works fine on my Denon DVD-5910.
I predict that this has to do something with magnetic field...

Kenk168 , Its all about the sound. If it costs $14 but improves the sound even better then go for it.

However, thus far, I don't have any problem with the ordinary (cheap) Copper sleeve not fitting snug to the power cable and it doesnt fall off.

I think the fitting with the neoprene gasket may be overkill.
But, keep us updated.

Nasaman, Strange about the Ayre D1-xe DVD player.

I have put copper sleeves in my Video system too.
Didnt work too so hot on my Denon 5.1 Reciever.
But worked great on my DVD player(Denon 5910) and on my DVD Recorder. The DVD recorder really has now a better picture.
I also put one on the AC end of my Sony LCD. Each one added improves more.
I think these sleeves work great on almost all digital.

Went copper coupler crazy and put the last two on the AC ends of the amp cords tonight, it's the icing on the cake.

Skipping the audiophile adjectives, the sound is very real, speakers flat-out disappear.

Total cost incl. tax under $60.00

Rx8man, Wow , that is great!
I wonder how long it will take Cable Manufactures to start offering exotic versions for big $$$.

Visited a fellow Audiogonner the other day and I brought along one of the 1 1/2" copper couplers.
He had a very nice sounding system that cost lots of money.
However, he uses just the standard power cords and interconnects.
He refused to even try the copper fitting, because he believed it would not do anything.