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Surprisingly or not, with the Minmeh I can hear the comb-filtering pattern dave has often posted. From ~3m away slightly off-axis ~0.4m, ear angled for maximum acuity, the sweet spots are ~10cm apart shifting (head) horizontally, or ~20cm forward/back. At these nodes the music is more open and realistic, presumably due to very high frequency present; away sounds a (very) little duller, less micro-dynamic contrast. I first noticed this when, each time I thought it sounded A+, with a head-sway it no longer was.

How to reduce horn/mouth/throat diffraction combing? VHF should be throat?

 
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Happy to report issue resolved with Art's diagnosis:

Pretty good now, ~35° horizontal coverage of flat FR to 12khz that I could hear (Faital HF108 exit angle being 31°). My cost was ahem $220 for eight used drivers (CD, Faital-inside, 12" Aura) plus significantly more than that for the Jantzen aircores and silver zcaps which I reuse for diy-of-the-day.
 

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