I think the 3 of us are just playing around to have fun and for instant visual gratification, not really sound quality. If for real audible sound quality reasons, we should be looking for effective ways to reduce those big dips in frequencies above 100 Hz. The minidsp, with or without Audyssey simply cannot do much about such deep dips. We can also provide all the details TheWarrior might have asked, but for now we seem to also wonder if he would come up with a low cost and effective solution.
By the way, has anyone seen better looking FR plots (including Dirac Live, Anthem ARC, Trinnov etc.) than ours? If yes, please provide links to such posts.