I used a DEQ2496 for subwoofer duties for a long time, to very good effect. I'm not sure I would use it for main speakers. There are aftermarket modifications to improve the analog audio quality.
But depending on what you're trying to do, a miniDSP SHD Studio might be a much better choice.
But depending on what you're trying to do, a miniDSP SHD Studio might be a much better choice.