Copper Sleeve over IEC

TBG,
There is defiantly a difference with using the copper sleeve.
I cant believe you can't detect it with all of your expensive equipment. I would say it is providing a shield around the IEC similar to what Furutech or Oyaide does with there Hi End power/IEC's that utilize aluminum and carbon fiber.
Perhaps with the magnetism from your HI Fidelity cables it is minimizing the effect.

But, I sometimes think with the copper sleeve over the IEC it accents the treble a little too much.

Ozzy, I tried this about four years ago. I gave up but have since used my meter to assess leakage. I have none.

Ozzy,

I'm getting a nice improvement on my DAC and transport.

Ozzy, Thank you very much for this tweak. Bought several from Lowes Hardware and Wow. Smoother more relaxed sound, without sacrificing detail and even improved overall soundstage a little. Used on iec at power cond. ,both ends of CD power cord , power supply of pre-amp, and iec of phono pre-amp. Also opening and closing your CD tray twice before playing made a significant difference (apparently improves reading of disc).

Swinfrey, Sometimes too many of them will dull the sound. But, do try them everywhere.
ozzy