'LFE pre-out to l&r inputs of the sub'? I don't think it's the cable, I think it's the signal level. L&R inputs would be expecting signal strengths destined for speakers while pre-out signals are line-level and need to be amplified. Is there an RCA 'line-in' jack on your sub? That's what you should connect to, and a plain old regular audio cable with RCA plugs should be fine.

-Brian n8wrl

2xM60ti, 2xM3ti, 2xQS4, VP100, EP350, N2's