I've been tasked with reducing the reverberation and noise in a large meeting room. I've done acoustic treatments in small studio spaces before, but never one as large as this. The floorspace of the room is 38' 10" by 28' 11", with an 11' 7" height. I can only put in treatments on the walls/ceiling, so no diffusion in the middle of the room. Budget is fairly open, but preferably under $1,000. The overall goal is to make it possible to have multiple groups conversing concurrently. Currently a hand clap or a loud laugh will take nearly 2 full seconds to dissipate, so this is nearly imposible.
My plan is to set up triangular absorption units in each corner from floor to ceiling. I'm looking at using Rockwool Safe 'n' Sound, in wooden frames, with particle board capping the top and bottom and covered with decorative fabric. They will extend 16 inches along each wall and measure 11.3 inches from corner to hypotenuse. I may also construct the units to easily split at half height, so that they can be carried into other rooms with lower ceilings if the need arises.
What are your thoughts on this design? My biggest concern is that the corners, while being high areas of reflection, are too far away from the centre in a large room like this and may be ineffectual. I would love to hear from someone more experienced whether they think this will work.