What would be interesting is if a dealer had some different length cables and try them yourself at the store. Of course the biggest downside is resale.
That said about 25 yrs ago a dealer did a demo of different speaker cable lengths. If I recall correctly it was a 5ft and 15ft run. I heard an ever so slight difference. Kind of like a slight reverb to the sound. At first it sounded a bit better like the room doubled in size. But as we switched back and forth I did prefer equal lengths. FWIW my rack is off to the side and if I did unequal lengths I would need 1M and 5M. But I have 2 - 5M sc's and zig zag the excess. Should I ever decide to upgrade the cables they will be easier to resell.
Again I can't recommend enough to try and demo different lengths if at all possible even if its some cheap bulk cable from a hardware store.
That said about 25 yrs ago a dealer did a demo of different speaker cable lengths. If I recall correctly it was a 5ft and 15ft run. I heard an ever so slight difference. Kind of like a slight reverb to the sound. At first it sounded a bit better like the room doubled in size. But as we switched back and forth I did prefer equal lengths. FWIW my rack is off to the side and if I did unequal lengths I would need 1M and 5M. But I have 2 - 5M sc's and zig zag the excess. Should I ever decide to upgrade the cables they will be easier to resell.
Again I can't recommend enough to try and demo different lengths if at all possible even if its some cheap bulk cable from a hardware store.