Originally Posted by audiovideoholic
I would like to avoid any arraying which is why I’m so interested in the proper 24.1.10 layout. It’s not that I want to use all 24 base channels it’s that I would like to use those that appear forward in the diagrams.
I want to reiterate something Sanjay said, just in case you blew past it on the hunt to make your primary point.
The surround info will not be arrayed across multiple speakers like it is in commercial cinema, with objects being treated separately and allowed to pass through individual speakers within the array.
The vast majority of the ear level sounds in Atmos (with some mixes, in fact, it will be 100% of the ear level sounds) will behave exactly like a 7.1 track. One speaker on each side wall (the "side" surrounds) will make noise during the movie, even if you have 4 speakers lining the side wall (FW > SS1 > SS > SS2).
The reason I mention this is because your diagram depicted a multi-row theater, and if the goal is to have an even surround field across both rows, it's important to be aware that you're going to have a single speaker on each side wall producing all the side surround effects. So if the Ls/Rs speakers are positioned adjacent to one row, they will be way out of position for the other row (and vice versa) and it will be impossible to balance the sound between the two rows. Especially if you've gone to all direct-firing monopole speakers to adhere to Atmos "specs" vs the old diffuse / wide dispersion surrounds that were typical previously.
Most people assume the "channel" part of the mix will array across those side surrounds, spreading the sound and providing even coverage across the rows. Arraying the side surrounds for multiple rows was common pre-Atmos, but now instead of those 2-3 side surround speakers all putting out surround info, with an Atmos mix (with no arrays) only 1 of the 2-3 speakers is producing it (worse coverage / more hot-spotting).
Trinnov themselves recommends arraying some side surrounds + top surrounds if you want even coverage across multiple rows, specifically because of this unfortunate behavior. If you installed a 15.1.10 setup and popped in that 4K + Atmos remaster of Saving Private Ryan, you might be surprised to discover only 9 of your 25 speakers make any noise. The extra 16 speakers are only used for dynamic objects, but if the mixer / studio decides to "print" the mix to a specific channel layout, tough luck
If you think "Dolby was pulling the wool over your eyes" because you took a simple marketing diagram too literally and couldn't reconcile a rectangle vs a circle so you decided "THIS INJUSTICE WILL NOT STAND, time to raise hell on an internet forum".... imagine how the affront of realizing only 9 out of 25 speakers are active would feel to you!! Thankfully Trinnovs are magical things and they have workarounds, for example they let you save different presets so you can switch on the fly between arrayed and non-arrayed setups.
Condescension and (well-earned) snark aside, can I ask a serious question? You are talking about a Trinnov setup with a lot of speakers and what looks like a really, really nice room. So I can only assume you've got a healthy budget. Can I ask why you are not working with a professional calibrator who is an expert with Trinnovs and knows the answers to these questions? It seems odd to me that you are making this kind of investment and yet determinedly seeking precise answers FROM STRANGERS ON AN INTERNET FORUM, when you can clearly afford to at minimum to consult with a world-class audio calibrator like Adam Pelz or Curt Hoyt who knows Trinnovs inside/out and would work closely with you to produce the desired result.
I'm not (well, only partially) trying to be a jerk about it, but I sincerely think you'd be happier working with a pro who is a literal expert in what we are discussing, someone who could be your consultant and guide and ensure you get the results you are looking for. Even if you're a DIY guy who doesn't want to contract out the whole project to an integrator/installer, you could at least leverage their vast experience and detailed knowledge as a consultant/advisory basis.
If you already are doing so, forgive me for ass-u-me-ing, but I also ass-u-me that if you had Adam or Curt already on staff as the Trinnov calibrator, you wouldn't be asking these questions here.