I'm a relative newbie to this forum but have read many past posts. Upgrading a midlevel HT with Denon 3802. Decided to add a Sony SAWM40 sub for LFE to compensate for older small Rear & side surround speakers (have purchased polyfil & feet not yet installed). Aesthetics will dictate about an 18 foot distance from 3802 to sub. I have 6' & 12' Radio Shack Gold interconnects I could easily link together and also a DIY RCA terminated Belden 9116 75 ohm coax. How important is the interconnect for a budget sub doing only LFE? I'm wondering which wire will sound better or should I go out and buy something else?