Thought I'd share some Dirac screens and compare the JTR coaxes in my theater with Adam Audio AMTs I'm using in my bedroom...
Adam Audio AMT LRs in my bedroom.
Due to asymmetric room layout and bad acoustics, Dirac is correcting some substantial differences between left and right speaker response.
Imaging and clarity are dramatically improved after Dirac.
Fortunately, my Dirac Live license included a second install for free.
JTR 212HTs in my theater.
Getting a dip between 180hz and 400hz that's troubling.
It changes when I move the mic up and down, so I suspect that this is a floor or ceiling cancellation.
It disappears when I move the mic close to the speakers.
Hopefully it can be addressed with some room treatment, but Dirac handles it, for now.
Also, I found that I preferred a less treble rolloff than with the Adam AMTs, and substantially less treble rolloff than with my previous Triad Platinum dome tweeters. The coax driver in the 212HTs sounds incredible, and doesn't need to be backed off to avoid harshness. This was more true with my Parasound A51 amp than with my Hypex NC400 amps, which had a bit of edge to them with the 212s (using the same target curve) that I didn't hear with the Triad Plats (probably because I had to roll off the treble to avoid harshness with either amp).
Dirac has a quirk where you need to zoom in to the right side of the graph and drag the correction window to the right, in order to avoid a spike with the 212s, due to the extended treble response. Doing this eliminated some harshness that the default Dirac settings produced.
My LFE channel, handled by 4x Rythmik F25s.
In my room, I preferred the crossover at 120hz, which the F25s seem to handle better.
Not sure if that's due to room modes, or just the performance of the F25s vs. 212HTs.
I suspect it's a combination of both.
One nice thing about these subs is that they play so clean, you have the option of using a higher crossover point, without localization problems typically introduced by harmonics caused by port noise or other distortion.
Dirac's mixed phase correction improves the impulse response nicely, in contrast with Audyssey, which I found to be detrimental to impulse response.
This is only half of the benefit of Dirac, though. The ability to fine tune the target curve & correction window with a nice UI and rapid comparison testing plays at least as much of a role in getting great sounding results.