The shorter the better less resantace. The other point is you can get a much better cable.
Speaker cable length for mono blocks
I shall soon be attempting to either vertically biamp or mono amp a pair of speakers. I can put the amps within 6" (inches) of the speakers if I wish. Should I connect the amps to the speakers with very short lengths (less than 2 feet) of quality speaker cable (12 AWG or greater) or should I hook up a conventional length (eg. 8 feet) of cable? The amps will be Pass Alephs and the speakers will be electrostatics.