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 SW-110 Powered Subwoofer for sale online | eBay
Klipsch SW110. 450 watts (peak) Wireless Subwoofer. Excellent Condition Perfect Working Very Nice Sound Will Test Before You Buy for Sale in Anaheim, CA - OfferUp
Amazon.com: K-MAINS AC Power Cord Cable Plug for Klipsch SW-308 SW-115 SW-310 SW-311 SW-112 SW-110 101167 Powered Subwoofer : Electronics
Klipsch SW110. 450 watts (peak) Wireless Subwoofer. Excellent Condition Perfect Working Very Nice Sound Will Test Before You Buy for Sale in Anaheim, CA - OfferUp
Klipsch Reference Premiere 1200 12" 600W Subwoofer Black 1070646 - Best Buy