In reply to:
Is there a parts/performance difference between using RG6 and RG59 for this type of thing?
Coaxial cable is notoriously hard to terminate with anything but a BNC or F connector. Collecting all the shield, twisting it together and soldering - huge pain - and if you miss one and it hits the centre lead, you get one of those hard-to-troubleshoot intermittant static experiences.
So, the easiest way is just buying a coax cable the right length (or "roll your own" if you have the tools) to an F-connector or BNC connector, get some F or BNC to RCA adaptors, and voila - sub cable.
As for RG59 vs RG6 - RG59 gets beaten up because it's older, but in this case, it'll work just fine. RG6 just extends up into the higher bandwidth area with less rolloff - which is important for satellite (the data communication between box and dish) and some digital cable, but for analog audio, RG59 is plenty good enough.
Bren R.