There's a very good reason for the similarities. The Sherwood P-965 has been out for over a year now, I believe, and Outlaw worked a deal with Etronics (the company that manufactures Sherwood gear) to use the 965 chassis as the basis for the 990. Outlaw has revised the software rather significantly (including the quadruple crossover bass management), added balanced outputs, and added DVI switching. Because of Outlaw's sales model, they are able to add these extras and still stick a lower price on the unit. Hope that helps.