[Prof.]

I have a 5'x4' window on the back wall of my theatre..which is about 50% of the wall area..
At the moment I have a blockout blind and a heavy black open weave curtain material over the window..

I'm thinking of removing both and replacing them with two removable panels..
These panels will just be timber framed with some type of "Insulation" material fitted and covered with a face material of some sort..

I have a bit of a dilemma with the "materials" needed for this set up, because the panels have to perform in three different ways..

1. It has to provide total blockout for the room.
2. It has to act as an insulator to keep outside heat from getting into the room.
3. It needs to be effective as an acoustic panel..Probably partly reflective and partly absorbent..

Can anyone recommend what would be the best type of insulation material to use, and what type of covering should the panels have.?