In regards to prirs for ceiling channels, I have something in mind.
While I don't own a realiser a present time (I used OOYH at times), I did spend some money to get PRIRs at AIX studios and a couple of showrooms in socal (through Darin Fong).
What I realized is that, once back home, the only set I liked was the AIX one, because all the others sounded like weird echo / the reverb was intrusive.
So for me at least, even though the standards are such that you should have some reverb / avoid direct field from the surround channels in regular setup, I actually seem to prefer PRIRs taken in rather dry room (so I need the personalized xfeed but not so much the acoustic imprint of the room).
So to my idea: am wondering if it would make sense to get my own "PRIRs" (more like hrtfs) with the speaker rather close and stuffing the room walls to attenuate reflections as much as possible so that direct field dominates.
I'd prealably calibrate the speakers using the AV amp correction software so that response is reasonably flat at measured location.
Then, I'd "simply" rotate the head to get the various headings, including elevation channels. The angle might not be accurate but, as long as the head is steady during the recording, it would be fine perhaps.
Now, there was no ability to use digital out from the A8 to feed an AV amp during PRIRs acquisition, hence one could not make use of receivers with room/speaker correction dsps (mandatory for my room / midrange at best speakers). Is this perhaps a solved issue with the A16? E.g. The calibration signals can be fed to AV amp through optical out and such?
Cheers,
Arnaud