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
I suggest you run only the length you need. I highly dought if anyone would ever detect a difference.
No one would hear any difference except for that annoying hum. Different length cables increase the chance of gound loop induced hum. Do them as close as possible.
Use what you need.Ground loops and length are not dependent on one or the other.
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.