AVS Club Gold
Join Date: Jul 2005
Location: Now in Colorado!
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Sounds like an awesome space to work with. Looking forward to the pics!
If you are 50/50 sports and movies that makes the choice a bit harder. I think, in that case, I would go with the largest 16:9 that will work for you, and use top/bottom masking to create your scope shape on screen. With the 50/50 point, that does make it a bit harder. What about video gaming, any of that in the theater?
Soundproofing needs to be all surfaces. That doesn't mean all need to be at the highest level, rather consistent, so you don't have an obvious weakness. Going for ultimate sound isolation is usually out of the budget for most people, so I wouldn't worry about that.
For your room's temp, if your basement is a constant temp you might be able to use air exchangers with the rest of your basement. You didn't state the actual room size inside the 21x21x10 area you are using. If you are using the majority of that you will have a large theater with enough seating for many adults. Those adults generate heat, so even though the basement is a constant 65, that sealed up room will get hot. One run likely won't cut it. You'll probably end up with two supplies and two returns.
Every man dies. Not every man really lives.