Dayton Audio XRA25 Wireless Rear Channel Amplifier System with Subwoofer No need to run long speaker cables, the XRA25 takes care of it wirelessly Speaker level inputs connect to the A/V receiver rear speaker outputs Subwoofer channel for placement of a powered subwoofer at the rear of the room 25 watts per channel output power at 4 ohms 2.4 GHz transmission band with 34 transmitting channels