Any real difference in RCA cables quality for sub?

Cables do make a difference with subs, especially if you have a really good sub. But. The difference is  small.

OP a Spdif cable works fine especially for longer runs or multiple subs.  Save all the money you would spend on exotic metal conductors and fancy connectors where it can make a difference, a single ended line level interconnect.

@grapeleap,

I am using Blue Jeans Cables  Mogami 16 foot pair of interconnects to my SVS sub. Cost was less than $50.00.  Bass is phenomenal.  Wouldn’t waste more on that as my sub cuts out at 60hz at 18 dB per octave.  

Has anyone actually done listening tests? I am just hearing mostly spitballing here. I have not, but always wondered. I always bought something cheap from a real audio company just to be careful. After hundreds of hours of comparing interconnects and speaker cables and noting such profound differences, I was tired and never found the time to do systematic tests. ... so would just hedge my bets. I’d really like to hear if someone with high end audio skill and experience has done some serious work.

Put it this way. I am really thorough and do an amazing number of things in the name of sound quality. The quality of the interconnect used for my subs is so critically important it is by far the cheapest and worst in my whole system. That's how much difference it makes.