Active 2-way, 2 channel crossover. Master level control for Channel 1 and 2. Low settings include Mono sub level, delay and Mute button.Low Hi range adjustable from 70 Hz-3.6K Hz. High section has adjustable Inactive level 0-10. Comes with external power supply Model RS 1 (Part # 151-005) broken tab, supply need to be secured to unit. No Rack rash, #8 condition