#1 its laYman
#2 as far as i can remember from my installing days, you ground the components-not the cables. one trick i did use quite a lot (1985 or so) on some pioneer decks--if your units are grounded properly you can make a short rca cable and only use the positive wire. so basically you're dropping the ground. even with all those ground isolators out there i used to be able to play with grounds to rid the noise problems.