I am using 2 RELs with not only two different lengths but two different cables. One is a standard REL and the other is one from Signal Cable. Both are longer than I need but I have never seriously considered cutting them. I save my obsessing for other parts of the system. The whole question of cables is murky in the extreme and highly system [and listener] dependent. I wouldn't worry about it.
REL subwoofer cable
I currently own two rel storms.After positioning the subs to where i want them,is it necessary to cut the neutrik link cable to lenght or can i leave them the lenght they are [approx.25 ft.].If I do have to cut them,do i cut them same the lenght or whatever it takes to reach the power amp.One sub is five ft. away from the amp and the other is twelve ft. away.