This is a very good, but discontinued unit. I bought it used off of eBay a little more than a year ago, and had been running both outputs of an Avalon U5 into it. Channel One was fed by the Avalon's Line Output and set to drive my stage rig. The U5's Mic output fed Channel Two and that was set for the FOH feed. Very transparent, but very effective. When I first got the unit, it had a bit of a "bzzzt" in the circuitry that the seller neglected to mention. After a trip to Presonus factory, it got it's "factory-authorized, new lease on life", so you know it's good to go! Cosmetics are ok, with the usual rack-rash and just a bit of the silk-screened "Presonus" logo flaked off. Here's a link for some of the particulars from Presonus: http://www.presonus.com/pdf/acp22.pdf $175 shipped!