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To seal or not to seal ...

I have a small room (12'6" x 12' x 10')that I'm planning to use as a listening room. The room has a floor of ceramic tile on a concrete slab, concrete block walls and ceiling of plywood sheet.

The room is completely sealed except for a 6" opening along the top of one wall. I'm thinking of sealing this 6" opening to provide some increased acoustic isolation, but I'd like to know whether this would be a good idea. In particular I want to know the likely effect that sealing the opening would have on the bass performance in the room.

If sealing would adversely affect bass performance is there something I can use to absorb the high and mid-frequencies without affecting the bass?
wcvb

Showing 2 responses by eldartford

eldartford
4,262 posts
 
Your room, as you describe it, sounds ideal for incarcerating terrorists.
eldartford
4,262 posts
 
To be constructive (for a change) your bass problems will be very severe, and bass problems cannot be cured by room treatment. The electronic approach is one that I use with great success, but in a room where the sound field is so resonant and stablized the electronic results will vary greatly depending on where exactly you place the the microphone. One thing that might help this would be a planar speaker, like a Magneplanar. The large area of the sound source makes the resonant sound field less sharply defined, and you might be able to do something with a Behringer DEQ2496.

High frequencies can be absorbed by lots of soft stuff on the walls and a rug on the floor. You might also want to hang something soft from the high plywood ceiling.
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