I did find this article, particularly pages 22-24:

https://www.harman.com/documents/LoudspeakersandRoomsPt2_0.pdf

My interpretation is don't mess up an average room by buying acoustic treatments for an imaginary problem. haha

I think wall-to-wall carpeting and drapery will probably do more for a room than any acoustic paneling or diffuser ever will.

Author of "Status 101: How To Keep Up In A World That Keeps Score While Buying Into Buying Less"