Subwoofer cable question for those in the know...

My preamp has an extra set of line level outputs to drive a powered sub.

Would there be any advantage to running separate L/R cables since it is purely a bottom end booster, or can I Y the signal out/signal in and run just one cable between pre and sub?

Also, what is the difference in construction between "subwoofer cables" and ordinary shielded RCA cables?

I haven't seen anything definitive, and I assume they are designed to carry just a low frequency signal better, as opposed to full range signals?

Advice, of course, is greatly appreciated.