I see where this is all leading too, Home cinema ego.
How many you can fit in and what SPL db they each reproduce.
There are many ways of designing the room with clusters of loudspeakers at low cost.
Anyone heard of eBaY its a place where you can spread out the cost of your budget steadily, without showing off you spent £500/$750 per pair of surrounds. You don't need the larger ones for cinema in the home, Its a smaller arena. not 1330 seats!
My room is small/tiny (15x 12x x7.8") but its not impossible to go THE Fully Atmos Monty, with 64 or more? The more is mostly made up with the surrounds and most of those surrounds in a cinema have been there for years. They only stick in a few more of the same model further towards the screen and couple more towards the corners of the rear. Often the overhead would be of the same model to keep timber balance the same as close as possible. The ones on the rear wall are the same.
Thou some of the newer JBL selected for Atmos and I'm surprised its not been THX certified? That is really neither here or there. I don't want those models on my ceiling they'll drop down lower than the present ones I have fitted up. Also the cost of those speakers would bust ones budget tenfold.
All the speakers are pre-wired in a cinema then wired up with more amps in the booth.
So all they need do is undo it and re-wire over the next few days and test it all out. (That's my guess and that's what I'd do).
I'm happy with JBL control 1 for the surrounds for the size room and give satisfactory bass mid feel. I have two extra 12" bass mid filtered with a CP45 on its sub bass and with that active on film, gives a nice extra low end extension.
I could in fact easily redo the present overhead control 5 x4 attached to the ceiling and redo with control 1, up to at least x8 or more. Depends on planing and spacing them out. Same with side wall. I have plenty enough for back wall. x4 but was thinking of putting in x2 more? x2 for each side wall at present.
I tried one formula by just eyeing my present surrounds and spacing between each on the side wall and come up with x8 per side wall and x8 per each left/right overhead x16. Back wall x6. Stage channels x3. Subs x4. 45 speakers.
I tried it again and used the tape measure.
73 speakers. I think the cost of total will be OVERKILL
not to mention speaker-cable and extra amps and EQ/delay/crossover control. Extremely expensive.
I think I'll keep it to 45.
Problem with Atmos only flaw is. No below stereo surround? I have below surround set-up here for use with some films to give it an exciting expansion surround. I need this Atmos with stereo-below-surround now to be delivered discretely with Atmos. I think they need to go back and re-think, Atmos. They need to re-channel the layout and share that in a cinema with speakers located underneath the fold-up seats.
Also the stage channels. They need to be ether updated with at least 9 screen at the minimum. 15 at the most for five screen above/middle/below.
There should be a upper three-screen
Common middle three-screen
And below bottom three-screen
So all the above can match on screen images and be a bit exciting over what has been now practice for decades. It needs to evolve.
A lot of films I watch and see where performers are on the screen and thinking how much better it would sound if voices or Foley footsteps and sound effects were to come from new locations behind the screen would be, a must listening for me.
Scene from ALWAYS with the guy sat on the wing should have his, voice on the upper centre stage channel. The girl yelling up should have her, voice coming from ether left middle stage as it would fit the area of the screen and the loudspeakers located behind. Her, footsteps should sound on the below left stage channel. Makes sound sense now as that is more less how I hear the real world when walking around and listening to crowed's of people. I don't hear their footsteps 6 or 10 feet above my head.
When walking to the plane footsteps should be moving form, below stage right across the screen,
When she thumps the latch on the door to the airplane it should be heard on centre upper channel. Her foot steps should still be on below centre stage channel.
Climbing into the plane. Sound should be positioned with below centre stage and centre middle stage channel with Foley sounds and atmosphere, plane engine noise in locations to the geometry of the plane and its surrounds closely.
Home would need smaller speakers for 9 screen bookshelf maybe, depends on the room size, height, width? If too small a height then smaller bookshelf models would be sited. Not HUGE cinema pa speakers otherwise its mixing in other brand speakers will sound dreadful with tonal characteristic when playing pink noise from a three of matched speakers to the other groups that are mismatched.
You got plan it. Not to extreme use common sense with large number of speakers as that is what Dolby Atmos, is trying to sell here.
I've had more CB radios in the past Cobra 148 GTL-DX that had more channels than Atmos. 120 channels of low mid high CW/FM/AM/USB/LSB. Even one Snake with Low/Mid/High/Double High/Triple High that went partly into the Ham band. That's 200 channels.