First of all, I don't know if a a totally flat response curve from your speakers is ideal, but a lot of people seem to think so and it seems like it should be easy to achieve.
The outlaw 990 already has a mic and auto calibration software, so it seems like it would be easy to incorporate a graphic equalizer in the OSD (why have equalizers gone out of fashion lately, anyway). The equalizer could be arbitrarily accurate, say, to intervals of 1/12th of an octave. The mic could record a frequency response tone and measure the speakers response, then invert the frequency response line and add that bias to all outputs from the pre amp / processor. This would be easy to do and would work, so why isn't it done?