speaker cable length question

It depends on a number of things. What your pre amp is feeding to the amps and whether you are using balanced or single ended IC’s for starters. I am running six meter XTR IC’s with a 600 ohm feed from the Aesthetix pre amp to Atma-Sphere mono blocks that are on eight foot speaker cables and they sound much better than when I ran short IC's and or shorter Speaker leads. The eight foot rule seems to pan out here. Another huge sonic benefit to this arrangement as well was getting the equipment out from between the speakers and on an adjacent wall. There are a lot of schools of thought on this subject. Here is one example that seems to break some rules yet works remarkably well. Keep in mind balanced architecture and balanced cables were designed to enable long cable runs to remote recording facilities and are responsible for capturing some of the finest classical recordings we have of all time, without it, these recordings would have been impossible. Later this technology was integrated into most all the recording studios of the world to connect microphones back to mixing boards and tape decks. In many (most) cases, your listening to music recorded through balanced systems. Finally, don't hesitate to speak with your manufacturer for their advise. Happy listening!