The proposed floor plan is below. I haven't quite figured out the bathroom area yet, so disregard some of that in the plan. There is a sump pump well in the middle of the left side of the basement plan that complicates it.
Finished HT size should be around 19 feet long and 16.5 feet wide by 6' 9 tall. It will be the biggest room of the house! I wish the length was a bit more, but I plan on using non reclining seating for the last row so I don't get them too close to the rear surrounds. The width of the room is great.
As far as AV equipment, I don't/won't have that much so am thinking of placing it outside the HT below the stairs.
I will be trying to isolate sound as much as possible using DD/GG and clips/track in the ceiling. I am not sure how I want to handle lighting because of this. I don't think I have the height to put in a soffit around the perimeter of the room, and I'm not sure that would give me enough lighting at the center of the room. I would like to have good lighting to allow use as a baby play room. I have to balance that with wanting dark colors for movie watching. I was thinking of using light colors for the walls, but then being able to pull dark curtains over the wall as used in this build: https://www.avsforum.com/avs-vb/showthread.php?t=1254505
This balanced with how much I like the look of fabric panels on the wall. This is something I can worry more about when I actually have walls!
I will be putting thick sound absorption on all walls and corners of the walls. I don't think I want to put any on the ceiling because of height. I am using line array so I have less need to treat the ceiling, but if I had more height, I would. On the floor, I was thinking of using the Delta-FL covered by foam play tiles: http://www.amazon.com/We-Sell-Mats-A...034295&sr=1-21
I would then use an area rug over the top of the foam tile. I am up for suggestions though. I have mixed feelings about carpet. It feels nice, but doesn't stay clean. You can't just swap it out because it is expensive and needs to be installed. We have cats too and they don't help the situation. An area rug is cheaper and can be changed easily. With the foam tile, it will be insulative and soft to walk on, but maybe less luxurious and stylish.but it will be priced to match at <$1/sqft. The other question I have is whether I can use the Delta-FL with the foam tile since it has those bumps on it. I may consider just using 6 mil plastic or the like for a vapor barrier.
One last note about sound isolation: I really want to build a rotary sub. I know, you have probably heard someone say that and it never happened. I will tell you that I have the skill and tools to build one. I have a CNC router that I made, plus I was a model RC airplane designer and manufacturer for a number of years. The issue I have with the rotary sub is how to isolate sound with it. With a baby on the way and close neighbors, a rotary sub (and my THT) will be worthless if I can't use them as a volume to shake human bodies. Do I need to isolate the utility/storage room if I vent the rotary sub there? I've heard that I probably don't because the rotary subs waves sort of cancel between the two waves. I'm not sure I believe that. The other issue is: what can I do to keep the rest of the sound in/out? I don't want to hear the furnace in the HT or the HT in the rest of the house. If I isolate the utility room, then I have to supply air to the gas furnace and water heater. Then I also have to figure that the hole the rotary sub has into the room will act as a HVAC return, so I have to put the supply in a different place. Anyway, if anyone has some insight, please let me know. I'm sure I will have future posts on this issue.
It would be much easier not to do the rotary sub - and not because of making the actual sub, but the room construction headaches! The thing that keeps pulling me back is how cool it would be to have.