Plus, you can wash them quickly to get the beer and smoke out of them.
Now, barring setting aside a huge chunk of your average 1800 sq ft tract home for use as a formal theatre room, let's say you've got young chillun and they need game screens ~ these deals are fantastic with kids. You can put them anywhere, take them down at will, set up more than one, project either side ~ and if they get cr*p imbedded in the screen, you can wash it.
Depends on what you need and what you can get for under $100.00
Did the DJ thing way back when ... when we had 12 plywood boxes full of LPs (and just one with about 150 CD’s suffed in it). We would have a large table in back, full of the vinyl, 2 Technics turntables with the ortofon turntable cartridges, couple of Crown amps for the subs, a Phase Linear and 2 Carver M-500t amps for the full-range speakers. Was a lot of fun; this was back in the 80’s and 90’s; long before there was much of a video component.
Some light organs, couple hundred feet of light rope, 24inch mirror ball and multi-colored spots, light organ panels, strobes, multi-colored floor floods - and 3 hours for $600. We played lots of High School Proms, dances, home comings and fund-raisers. Had a lot of fun, and made enough profit that it helped pay my way through college. Beat the heck out of stocking shelves or delivering pizza. Did this for 6 years, and loved every minute of it.
So, I know all about the convenience of packing small, durability and inexpensive. And for kids and games - this would be almost ideal. Quick set-up, quick tear down. Like you said, for smaller tract homes, this is a very workable configuration.
Now I’m an old geezer - and I just don’t want to mess with that anymore. So, I build my man-cave on the main floor; and did some sound-proofing. If you are building, you can do quite a lot of sound-proofing for very little cash. My home was substancially larger than yours - so I had room for a small theater room (13’ x 17’), my next house will have a much larger theater room.
I suggest using a 2x6 footer and header. Lay one wall with 2x4 studs set at 16 inches along one wall - and the inside wall uses 2x4 studs set 8 inches off the studs on the other wall. This creates a ‘Baffle’, such that bass hits the sheetrock inside the room, and doesn’t transfer to the outside wall directly. Fill the inside space with insulation - and you are 75% of the way there. Inside wall, substitute a product called “Quiet-Rock” in place of standard sheet-rock, and that will also make a huge difference. Use a solid core door; and you are 95% of the way there.
Also made some changes to the heating/cooling vents to reduce noise bleed. End result is that I can be making my ears bleed inside the room; and although you might hear some noise in the Kitchen; you will never know anyone is home from the outside. You will be able to comfortably watch TV in the Living room, and may only notice the Theater Room at full throttle during commercial breaks.