Copper Sleeve over IEC

I placed a piece of copper foil coupled with a brass weight over the first plug socket on my power strip. You can hear the noise level drop. This strip is for my digital source only.

There was no improvement when I moved the copper/brass to the middle or end of the strip.

Did anyone try the double copper shielding like I have? Please report your findings. Very curious what you are hearing compared to a single coupler.

Thanks

Ozzy, double the copper, you know, 1/2" inside a 2" copper coupler with a foam film in between. I am using Alan Maher's Power Enhancer also, all are fine tuned for music.

I have a live sounding room so the high frequencies are just fine. I've been using copper as a shield since my Marantz days. Nice improvement on my HDTV too. Acts as a shield on any open unused inputs.