In my opinion the power cord for your amp can be as short as you want to make them and I don't believe it will impair the sound.
I have no doubt others will disagree however I have compared .5/M,1/M, 1.5/M and 2/M and I could not detect a difference.
I have no doubt others will disagree however I have compared .5/M,1/M, 1.5/M and 2/M and I could not detect a difference.