They are built with an 3/4" thick foam core insulation board, faced on one side with foil, open on the side facing the room. The frame is built from 1 x 2 pine. The foil on the back of the foam is made to lap over the back of the frame and is stapled into place. Then the entire rectangle is covered with a heavy fabric (color to match the scheme of the room) tucked at the corners like upholstary and wrapped to the rear and again stapled. The fabric is also glued on the face side to the foam and frame to prevent sagging. We used 3M spray on adhesive.
The last movie house I built was an Imax in Boise. The acoustic panels were spaced 2" apart on all sides. The gaps painted black in most areas. Sometimes in the hallways the gaps were covered with chrome or brass strips. Side walls in the viewing room started at 20' tall and rose to about 45' as the floor dropped towards the front and screen. Panels were shaped to follow all contours.
Your single story building should be easy. Get creative with shapes and colors if you want. The point is to absorb excess sound waves before they echo. This is done with the fabric and foam. Often in high traffic areas, or near the floor, panels are made over plywood rather than foam so they can handle the abuse. Acoustic tiles in an drop grid are usually used at the ceiling. A glue down or staple down type tile could be applied over furring strips shot onto the ceiling if metal grid is not wanted.
Normally the acoustic treatment is part of the design process and integral with other finishes. If this is the building I think it is, no consideration was given to acoustics. Playing catch-up now could be difficult, but doable.
Good luck, Rojo
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