Top of the line Biamp Club Mixer from back in the day. Four Channels, tons of in and out options, good phono preamps x2, Sounds great, super low end for club sound (bass enhance button), subwoofer out with selectable cross over frequency) Check out the link for the specs and feature list. Perfect working order except for one pot (Mic 1 of two Mic inputs), insert effects on mics and main, etc.. 75$ OBO or $125 with pot replacement and full cleaning and lubrication of all controls/switches, etc.. . Great solution if you have a ton of inputs. Rack mountable.