A+ now, but it took some laps.
All measurements done with a Onkyo TX-NR7100's built-in Dirac Live and 5.0 layout.
Main EQ reason are some large room modes, over +15dB.
- First try with the accessory mic. Although advertised as calibrated, it had an obvious bad frequency response.
- Measurements with the UMIK-1 looked more reasonable. Expect a wiggled tilted line.
My listening area is quite asymmetrical, the main place almost on one edge.
Additionally, one side is a large living room closet, the other side open to the rest of the room.
The room modes were gone, but imaging worse.
- Tried partial correction up to 300Hz. Lively, but also a bit "phasey".
The transition to non-corrected looks good on the graph though.
- Re-did the 13-point measurements on a more focused and symmetrical area.
Loudspeaker levels corrected, Dolby Surround, Center spread on.
Big change, balance and imaging very natural now for 2.0 and all other material.
And less of a disaster for the other places as thought.
Target curve is, as always, a question of taste. I use some cues for credibility:
- LFE, low bass: effects/umph. Depends.
- mid bass: male and female voices, outdoor (too thin?) and in a close room (too boomy?)
- tilt: besides general too bright or dark, does dialog sound recessed or leaning forward?
Usually sound is most natural if you preserve the measured slope in the mid/upper
frequency range.
I was not able to jointly optimize the last two points using the DL GUI (bass-flat-treble) controls.
So far happy with Bruel&Kjaer / Bob Katz / Quad amp family of tilted curves.