Leafs, that is not always true. Whenever there is resistance in the ground path there is the potential for a ground loop but in this case I happen to agree with you that making both power lines the same length helps no one except the person the wire is bought from.
dedicated lines, equal length?
I just moved and need to run dedicated lines for my system. I'm using monoblocks and have the speakers along the long wall so there is a signifcant diffference in the length of lines required to run the front end and one amp and that required to run the other amp I estimate about 20 ft differce with about 75 ft required to run the longest line. Will this make much of a difference or should i run equal lengths and just loose the excess for the one side around in between the joists? thanks