Subwoofer RCA Cable

i run Benchmark XLR cables from my preamp to the sub. I then use a Cardas XLR to RCA adapter to connect to the RCA inputs of my KEF KC62 sub. I do not worry about long runs with XLR's.

As far as RCA sub cables go, I’ve only compared DH Labs sub cables, and not against cables that are meant for full frequencies. That said, the DH Labs Thunder cable, which is made of pure silver coated copper conductors, proprietary shielding and solid copper connectors were much higher performers than the DH Labs Sun Sonic cable which uses copper conductors. Stepping up to the Thunder resulted in much improved speed, definition and amount of kick. The Sub Sonic was much rounder and slower in comparison. 

It will depend on who you ask, but most people who believe in investing in quality cables including me will say yes. I say it like this because any cable thread is bound to go south on this forum.

Wait for it…

Don't go cheap but don't go broke either. A quality RCA. I use the supplied NEUTRIK SPEAKON that came with my REL Subs. 

Sub cables typically have differences in both the conductor and/or dielectric (shielding) to prioritize the current delivery of lower frequencies and…

Interconnect cables are typically voltage devices as the input impedance is very high.
There is almost no current in these cables to speak of.

needed speed without worrying about the tone of the higher frequencies.

The speed of electricity is the same in all conductors, and it is about a million times higher than the speed of sound.