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I am in a new highschool classroom that is renovated from a former swimming pool. Room is 20' x 35'. Floor is concrete with compositiom tile. We need that for class. The ceiling concrete, 9' with 3 concrete beams to 7'8.
Two walls are glazed brick (from the former pool).
It is very noisey!. Reverberation easily lasts 2 or maybe 3.
I actually know that architects and I know this would not have been as bad if one of the two Gyp Partitions had been skewed a few inches. Only build two months ago. It would have cost nothing. My owners rep is burned from the final punch-out process and said I should solve it myself.
I want to add something to the ceilings, mayby the walls. The ceiling could acccomidatre 1 - 5' sq "Clouds" hung from the concrete. Walls, I could do fabric covered homosite or ?? -- 6' x 32 and 4 ft x 20 The brand new hung lighting strips preclude dropped ceilings. What do you sugest?
Love to do it from Home Depot stuff. Could order something exotic if that is better.

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One more question. Are there any easy classroom experiments with reverb that I could use to demonstration the improvement? Go light on advanced test equipment.