Rear surround speaker

[lakeray]

I have the RM6600 set and a 650 subwoofer. I now want to add a rear center (?) or whatever to make it total surround. I can do 7.1 and 6.1. What do you guys think would be best?

Thanks all

[mantis]

I would use the same center channel or the same main speakers in the rm system.I don't know if polk sells the in pairs or as a single, maybe you should call them on this.