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

tooth2th

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.

OP, for pair of subs, use the supplied high level Neutrik Speakon 3-lead cable as below,

Twist red and yellow wires together of LEFT REL sub and connect them to the L channel positive binding post. And connect black wire of left REL sub to the L channel negative binding post. Repeat these steps for your RIGHT REL sub / right channel.

In some instances, twisting red and yellow wires together may result in exceptionally high gain (output) from the RELs. If this is the case, please remove either the red or yellow wire from the twisted pair and use electrical tape to mask the loose wire. This will reduce output by half and restore a natural dynamic.