This Dirac ART situation is extremely complex in my system since I'm running fully active speakers for the front LCR's and a separate infrasonic sub. The infrasonic bass feature of DIRAC ART is NOT working properly and is still employing a HPF on my main channels at 20Hz.
Dirac ART also doesn't do infrasonic bass correction below 20Hz which can also be some of the reasons I'm running into issues.
I am investigating ALL of this with Nilo and Mathias from DIRAC as I want to get the best possible calibration before I do a full report.
There are a handful of people that know how to use Dirac ART correctly and I'm talking to ALL of them now to ensure the best results. It takes time when you're bleeding edge and running a complex system like mine. Stay tuned...