Any suggestions on good subwoofer interconnects?

IMO when long RCA cable runs are required, its best to go with a coaxal digital cable. IMO it seems to carry the signal better on long runs.

You might also look into the Anaylsis Plus Sub Oval interconnect which is quite reasonably priced.

I would look for used or demo models of Tara Labs RSC Prime Generation 2 or RSC Reference Generation 2. They're great subwoofer interconnects and come up fairly often here on Audiogon and sometimes even on ebay. I love them in my system. Bill

I've had good results with Better Cables on long runs