My church is building a sanctuary in a room that is roughly 36' X 58'. The ceiling is around 13' tall with a air duck around the perimeter of the room roughly 1'X4'. The walls are concrete and cinderblock with concrete floor. Yep. This is a perfectly rectangular cement box... Having no sound engineer the lot of that office falls to me (The music director). I know next to nothing about acoustics and could use all the help i can get seeing as the budget will not allow for me to hire someone to come out and do the work. I have spent hours and hours reading all the info i can find on the web and have come out of it all with some vague princibles and my mind being basically numb. I feel like my brain is rockwool (didn't know what that was until last week)
SOO... The room is going to be dry-walled. After that I am going to build the stage (around 9" high, 12' deep and 36' wide) and begin to attempt acoustic treatment. The room will be carped everywhere but the stage which will be hard wood.
I understand that carpet, padded seating, and human bodies will deaden some of what is now a reverb chamber (around 3 seconds worth). My plan was to concentrate on the bass and in doing so, hopefully absorb an adequate amount of all that other stuff with it. So outside of just general deflection treatment my plan was to treat the entire stage wall. Floor to sealing bass traps in both corners and Helmholtz slot resonators spanning the distance between. I will probably rockwool and fabric up the wall about 4 feet up and then to the Helmholtz the rest of the way. I will stager and slant the helmholtz' to fight standing waves a bit.
I have to admit that looks are playing a factor in the design, the slot resonators look great and I do want to preserve some of the room's "liveness".
I was also thinking about loose masse traps on the back wall, even some on the stage. Question: Can I put different types of bass traps (like loose mass or damped panel traps) behind a sloted wall to maintain the look of the resonators while performing a slightly different function?
Anyone have any recommendations or experience working on such a room? Anything would be greatly appreciated.