You can use the Neutrik Speakon 3-lead cable that is delivered with most REL subs (or buy one separately) yellow and red to the positive speaker terminals on both channels and the black to either channel negative. I have a modded-upgraded R8 and use a Rel T7i (one sub). Works very well.
Connecting Subwoofer’s to Willsenton R8
I have been wanting to add 2 Rel S/ 510 or 812 subwoofers to my system. I have a Willsenton R8 (upgraded tubes) , newer Cornwall 4s speakers. I am confused with the many solutions I have read and even some say you can’t add subwoofers. I also have a McIntosh C2500 tube preamp running a separate system . If anyone can tell me in simple terms how or if this can be done.
thank you