The SP® 218 subwoofer features two 18" Pro Rider® woofers. Power handling is 2,400 watts program and 4,800 watts peak, with low frequency response down to 41Hz. Inputs include one four-pin twist lock connector and two 1/4" phone jacks all in parallel, and one Neutrik® Speakon® switching jack for independent access to the woofers. Threaded pole for mount included.