Any real difference in RCA cables quality for sub?

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.

@millercarbon Good to hear... this has always made sense to me... but so frequently the differences I hear do not make sense. For instance, I just switched the power cord on my Aurender W20SE from a Shunyatta Venom 14 D to a Cardas Clear Beyond and it produced a noticable improvement in bass and detail... the Aurender audio circuits run on battery power to avoid line current... it just plain shouldn’t matter. So for fun, I switched to a WireWorld Silver Electra 7... harsh... You just have to listen.

I think WW did develop cables specifically for subwoofers

If the power cord affects it like that this tells me the Aurender is using batteries to avoid building a more expensive power supply. But if the batteries are connected to AC then all the AC line noise can ride across the batteries same as it rides across even a very expensive power supply. Think about it. If power supplies worked perfectly power cords would not work at all.