My system was purchased in 2012 and I have a SW-110. I just upgraded my AVI and would like to add an additional sub. I've contacted Klipsch and they advised getting the
Klipsch R-120SWi Wireless Subwoofer | Costco
Klipsch Reference R-121SW 12” Front-Firing Subwoofer | Snap One
Authorized on line Klipsch Dealer. Klipsch Reference Premier In Stock Now! Home Theater Systems, In Wall Speakers & more. Call 1-800-691-6914.