The NX-9 is an awesome projector, but as noted, it's not the best "value" or long term 8K solution. Having said that, "faux" 8K resolution, (E-Shift), could be beneficial today on a very large screen like you are considering. (Personally, I would not go that big, especially if it means the screen goes all the way to the floor. I've been in rooms with oversized screens like this and it's not comfortable viewing, and the rear row is very likely to be blocked. Optimal screen sizes for viewing distance can be calculated here: https://www.projectorscreen.com/proj...en-calculators
Are you considering sound isolation/soundproofing during the construction phase. It's is almost impossible to do this after-the-fact, so consider it now:
Before talking audio, there's a few more video questions to ask first:
- Is the 200" screen the diagonal measurement, or the screen width measurement?
- Will the screen be a "scope" screen, (2.35:1) or standard TV AR, (16:9) If scope, will you use a curved screen with an A-lens? (This would be recommended for such a large screen.)
- Will masking be used for other aspect ratios than the native screen AR?
- Will you be using an acoustically transparent screen? If so, you can use the ideal of 3 identical speakers placed behind the screen, all mounted at the ideal height of "tweeters at ear height" for the primary row.
- Will the screen be mounted in a false wall? How will that be constructed? Is a speaker baffle wall a possibility? In-walls would be unnecessary if using a false wall. However, if in-walls are required, an optimally designed baffle wall is a better option that mounting in drywall.)
Pro HT designer and former THX and Lucas Films engineer, Anthony Grimani has a series of videos on HT design that you may find useful. They go over screens, speaker layouts, room acoustics, false walls, baffle walls and a lot more.
See "Completed", then see April 13 and April 20.
In terms of the electronics, the pre/pro to consider is the Marantz 8805. https://www.us.marantz.com/en-US/sho...parates/av8805
It can do 13.2 channels of processing. To get more than that, you'll need to spend more than half your budget on a Trinnov or DataSat processor. IMO, that would be an inappropriate allocation of resources. Speakers and subs should make up the vast majority of your budget. Also, you'll need 13 channels of amplification. With a pre/pro like the Maratnz, these will need to be separate amps. You could look at the Denon AVR-X8500H https://usa.denon.com/en-us/shop/rec...d=883795004374
It can also do 13.2 channel processing and has on-board amps. Depending on your speaker choices, you may want to use an outboard amp for the front 3 LCR's.
In terms of subs, you will definitely want to factor multiple subs into the system. Read this: https://www.harman.com/documents/multsubs_0.pdf
Your rectangular room is the ideal application of this research. 4 subs, one at each mid-wall, or one in each corner will be optimal. Two subs, one front and one back can get close to this, but 4 is usually better than two.
Another excellent resource is the Dedicated Theater, Design and Construction Forum on this website: https://www.avsforum.com/forum/19-de...-construction/
You may even want to take your thread over there. (If so, ask a moderator to move it for you.)