I did have an interconnect from my old receiver to my old sub, the total outside diameter was about 1/8", I'm guessing the center conductor couldn't have been more than a few strands. Anyway, replacing it with a $20 cable made a world of difference.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris