Curt, thank you so much for starting this thread! I hope I don't wear you out with all of the questions I have.
First, a little background:
I'm back to a 972 after having one of the early ones and selling it over frustration with setup issues; it was followed by a Denon 4810, and then a 4811.
My interest in Trinnov was reignited by Dan Francis' thread in the High End forum http://www.avsforum.com/avs-vb/showthread.php?t=1366849
, and the realization that even with 11 ch, Audyssey XT32, and a Pro kit, the Denons' sound still wasn't as good as it had been with the 972 (at least for a couple of the setups); it never matched the ease and refinement of the 972's sound, with or w/o EQ.
With my new 972 I haven't yet equaled the mellifluous sound and sonic bubble I lucked into with one of the setup attempts with my first one, though I'd still take what I have right now over the Denon's.
OK, now to my questions; to increase digestibility I'm going to break my questions up into several posts.How to get good measurements
As others, I've had difficulty getting all of my speakers to be recognized.
Curt's suggestions have been very helpful, but one thing I haven't seen mentioned yet is an apparent randomness to the results; while fussing with tiny adjustments to the mike to get the center to be at 0 deg azimuth, various of the surround speakers would fail to be recognized.
Sometimes I would change nothing and the same thing would happen.
I guess it could be that I'm not exactly following the guideline to point the speakers directly at the mike.
All of my speakers are monopolar controlled directivity designs, which at midrange and above freq gives a diminishing output off axis with minimal treble rolloff.
L/C/R are 18Sound 12ND710 woofers with BMS 4552ND compression drivers on XT1086 horns and the surrounds are B&C 8CX21 coaxials.
All of them are crossfired to maintain uniform SPL over the two-row listening area; (see 1st and 2nd pics)..
I haven't had problems with the fronts except once for no apparent reason (that randomness again), but the surrounds have been problematic.
I'd just repoint them but I spent a lot of time making fixed plate mounts that set the desired angles and they're screwed onto the walls.
What I don't understand is why Trinnov would be so sensitive to this; I'd think that it would straightforward to distinguish between the first arrival sound and the earliest reflection, even if the latter were somehow louder, as long as there's enough time between them.
I have to say my jaw dropped when Curt suggested using a pair of speakers per channel; if I'm having trouble getting it to recognize a single speaker, presumably because of reflections, I'd think a second speaker would drive it nuts.
How does Trinnov distinguish between a second speaker and a very strong, very early reflection, unless it's at exactly the same distance as the first?
Curt, can you shed any light on what parameters Trinnov uses to decide that a measurement is good?