Room curve at MLP all speakers driven. Look at the impulse response and note exact timing of all speakers at the MLP which is center chair of middle row of three rows. It is a nine seat theater.
There is a little room gain below 30 Hz but it is not unpleasant. No Eq used. AVP is Marantz 7705 with Audyssey totally disengaged and no Eq. used.
Sure the odd room is a real dud, but a lot in fact most are not. Most of the problems are caused from speaker problems and their shortcomings interacting with the room to compound the problems.
Many have noted that superb speakers do not usually interact negatively in most rooms. If that were not so, then peoples voices would sound different in every room and generally they do not. I have not used Dirac, but have used Audyssey in at least four rooms, and in every case audio quality was significantly downgraded.
I can tell you I have no desire or need to spend money on a unit with Dirac live. Everything has been precisely balanced and now needs leaving alone, which it has been for the last three years.
My own experience with Audyssey matches yours, the setup always sounded better with it turned off.
However this was not the case with Dirac (which I first installed in March this year) - I initially compared my old AVR (without Audyssey running), to the new AVR - noted sound degradation... - put my external amps in the circuit on the new AVR... and noted that the sound was to all intents and purposes identical to the old one... as it should be! (the old Onkyo/Integra was a beast capable of 165W@8ohm into stereo - and handled my difficult 1.65ohm speakers well ... not the case with the weanie lightweight Integra 3.4 I have now)
Enabled Dirac and did a quick tuning with it (3 positions measured, centered on MLP) - and immediately noted an improvement in midrange clarity, vocals....
Went back and forth a little bit to confirm - and then decommissioned the old unit (and sold it... went to a new home).
So yes - I do find that Dirac has made a positive difference to the subjective experience of listening to my system.
At some point, when I have the house to myself, and the appropriate inclination, I may run a full suite of measurements and see where things are at, using something more than just my ears.
But for now, I am very happy with what my ears are telling me, about Dirac - and therefore looking forward to what the new SRC could potentially bring to the table.
It is worth keeping in mind that SRC is a whole different ball game - it is a paradigm shift in what one can do within a listening room.... in theory.
Whether the practice actually matches the theory is yet to be seen.
And it well may be that getting the best from such a system, would require specific types of speakers... it may work better with highly directive speakers as opposed to wide dispersion types, it is likely to work best with multiple full range speakers, rather than the current norm of running bookshelves/satellites around the room.
If it works as advertised (which as I said, is yet to be seen/heard) - then it could quite dramatically change the HT marketplace... including those of us that use our HT as a dual purpose music/HT setup.
But I reiterate - where previously, with Audyssey the system sounded best with it off, Dirac now never gets turned off.