This is a special purchase by Apex Jr. This unit was originally designed for a JBL speaker system that has since been discontinued. The Bass Wave features 100 watts of power @ 8 ohms. A 125hz electronic low pass filter is built in. The units handles powering on and off via a signal sensing circuit. Switchable high and low level inputs make it easy to match the Bass wave to any receiver or preamp. There is a two wire 120VAC line attached and these mono amps. The Bass Wave can be yours for $50.00 New.