Only requires Front Two Channels for input from the source unit then has Front, Rear and Sub Woofer Left & Right outputs. The Sub Woofer output includes an electric (active 24 dB) crossover at 90 HZ and can be changed out to 30 HZ - 3500 HZ or can by-passed. Line Driver up to 13 v and two 1/8 Aux. plugs, one on the front and one on the back for Ipod or other devices. I use this pre amp along with the Audio Control 6XS for a 4-way active crossover system.
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