REL Subwoofer: Speakon or RCA?

So, I'm currently connecting my Rogue Cronus Magnum amp to my REL Subwoofer using L/R RCA Cables. I'm leaving the amp via its variable output L/R RCA connection to the REL subwoofer L/R RCA inputs. I'm satisfied with the results. But now am wondering if, practically, I would hear an improvement (if so where? how?) if I switched to the Speakon cable for connection type. What do you think?