The older design PAPER based, typically gray in color egg carton material does indeed improve acoustic reflections when implemented in a proper fashion -- and that is measurable with the proper test equipments such as real time analyzer. I have done those measurements in the past.

If some youngster tried to use the newer blown plastic "styrofoam" type egg crates, I doubt seriously if they would provide the same level of absorption.

Yes, there is indeed a fire hazard involved with the old gray paper egg crates. That said, they were rather ubiquitous in smaller radio station studios at one time. I've even heard of people claiming to have somehow chemically treated the paper material style with some type of fire retardant, don't know what that might be and would question the amount of effectiveness of such, as well as possible chemical exposures over time, which these days should be a serious consideration as well.

Consider using modern fire resistant rug material on the center portions of each of the hard walls.


--Mac

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