Originally Posted by Anand Patel
OK. I know it's an odd shape and there's stuff in the way. But it's the space that I have to work with. It's in the basement. The left and top walls (on the diagram) are concrete foundation walls behind the frame and drywall. The ceiling is insulated, but I could change insulation, etc., to achieve soundproofing. The door is the "5ft 0in" on the right hand side (couldn't figure out how to get doors to work in Roomle).
Current plan is to have a 120" wide screen on the wall (marked in red).
15 feet is where the box ("beamer" aka projector) is located -- that's viewing distance for 120" wide per the calculator.
Goal is to have 2 rows of seating, with risers.
Have access to the walls -- none of this is built yet (framed but not even drywalled).
Drop ceiling for wiring and upgrading ease, with acoustical ceiling tiles. Interested in thoughts on soundproofing the ceiling.
Double drywall with green glue for soundproofing (walls).
In-wall speakers with AT screen (I like the look, am not here to debate the merits/flaws of in-wall speakers). Am thinking in-ceiling surrounds at present.
Doing a "room in a room" has little appeal, as it would shrink the HT to the point that it would end up being smaller than our living room. However, adding a single wall on the right of the room (making the screen the bottom of a rectangle), may be an option.
I don't expect it to have perfect soundproofing OR ideal sound quality, but would like to be able to watch movies with good surround sound on a big screen.
Requesting help / encouragement / creative and/or technological solutions to get this space to work.
Soundproofing involves decoupling, mass, damping, and absorption, arguably in descending order. Skipping one degrades the whole soundproofing system. For example, massive concrete walls that are coupled to the rest of the structure will transmit a lot of sound.
Drop ceiling is terrible for soundproofing--not decoupled, little mass, poor damping, though perhaps good absorption if you put some insulation in the cavities.
Double drywall = mass, which is good, but much better if decoupled (e.g. with clip and channel or dual-stud or staggered-stud construction). Green Glue = damping, but again, better decoupled.
I think you may have the misconception that "room within a room" involves dual stud construction. That's very rare, actually. Most room within a room involves clip and channel to decouple, and that doesn't cost much room volume. Staggered stud is another option that doesn't need to add much wall thickness (e.g. + 1 inch), decouples similar to clip and channel (if I recall correctly, less good at higher frequencies, better at lower frequencies).
In-wall speakers behind an AT screen? You'll pay a premium versus regular speakers, but that's fine if you want the screen flush or close to the wall. But then you say you like the look, so maybe you mean in-wall speakers next to, below, or above the screen? No room next to screen, so in that case it must be below or above, that's not ideal, though doable.