EX power cord skeptik needs help

out of boredom today i plugged my mesa boogie powercord into my arcam7 cd player---the mesa cord was a more heavy duty cord compared to the cheesey one supplied by arcam.... wow what a difference it made,bit more bass and slam ,tiny bit more detail, it made the whole player sound a bit nicer,BUT!!! a bit TOO much treble..... what i want to do now is build a powercord---does anyone have a suggestion on what wire/material would be best to use so i DONT have that added treble.(silver/copper/ect)......or is this what most powercords do, add some treble as they are of a more revealing material????thanx