I'm a REL dealer. Speakon is way better because the amp in the REL will emulate the character of the amp so the blending and seamlessness is much better. It will sound like the amp in the REL is a Rogue.
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?