Makes perfect sense to me too (mic positions). I am looking forward to moving to Dirac, and see what it can do for me.Agree totally with your last observation there. I just started from what seemed obvious to me - that if the mic doesn't have a really uninterrupted line of sight to every speaker, then the result is pretty much guaranteed to be sub-optimal. After all, my ears have a clear line of sight to every speaker In my room, with my high-back cinema chairs, this requires me to raise the mic quite a bit over and above the initial mic position (which is with the tip of the mic just above the MLP seat back - not quite where my ears go, but again, required if clear line of sight is a priority). Then, as I say, I completed the final 4 measurements 'randomly' around the seating area, but always making sure that the mic can 'see' all the speakers. It may be a compromised method, but then my HT is a set of compromises anyway, as many are. The bottom line is that I have better sound right now than I have ever done before.
As I am a newbie here, perhaps I should say that I am a very experienced user of Audyssey and Audyssey Pro and my current system is an Atmos 5.2.4 setup. Main speakers are M&K S150, surrounds are Tannoy Di6 DC (chosen for their good nearfield characteristics and coherent phase - my room is very small and the surrounds are closer than I'd ideally like) and the overhead speakers are Tannoy Di5 DC (chosen for their very wide dispersion - as per Dolby recommendations - and their power handling capabilities for my -5dB below cinema reference movie listening). Subs are dual Seaton Submersives in a Master/Slave arrangement. Amplification is 'adequate' for my purpose
I have read your other forum posts (about Audyssey), and very much agree with you.:T:T