Hi Dave,
Thank you so much for posting that data here!
You have hit on a very important topic: That of acoustic treatment vs electronic equalization. The neptuneEQ, the Audyssey and all of the others can and will make vast improvements in the sound quality of any room, vs unequalized. There is a Hollywood sound editor who is evaluating our product (against the Audyssey) for a writeup in the editor's guild magazine, and he recently (this last weekend) ran a neptuneEQ demo in a professional recording studio. The result was a bare minimum of equalization, but of course, some (and a proportional improvement in sound quality), which goes to show that even the best engineered rooms with the best loudspeakers can benefit from automatic room correction.
No electronic device can improve RT-60 times. That is entirely in the realm of acoustic treatment. Similarly, no room correction can eliminate frequency response aberrations, unless you have your walls and ceiling removed. That said, electronic room correction can mask reverberation problems by reducing the excitement in resonant bands, and acoustic treatment can improve response errors by reducing those resonances.
Your RT-60 decay times look pretty good. You have done a good job treating your room IMO. Treating the lower frequencies is much more difficult than the higher frequencies, but you don't seem to have any problem down low (in the measurement area). One nice thing about automatic room correction is that it can be added to any room at any time. If acoustic treatment is going to be performed at a later date, real improvements can be realized right away, then after treatment, the equalization can easily be repeated for optimal improvements afterward.
I'm very pleased to hear, as you have told me earlier, that your neptuneEQ has made your sound much better! I see you had a rather huge hole in your bass response's upper region which has been filled in nicely. Like my system (which had a similar problem), I imagine the sound is much more full.
It does appear that (in the measurement shown) that you have a bit of high frequency rolloff. While the goal of a good room EQ is a flat starting point, wild EQ is not desirable, so special algorithms are incorporated in the neptuneEQ to retain the natural sound of the loudspeaker. Are these direct radiating speakers, and were you on axis during that measurement?
Ken