i should like to add that i propose nothing formal, nothing intended to replace the official standards, nothing like that.
and i happen to have a keen curiosity about this "a bad wall helps low frequency modal problems" concept since a fellow on another forum posted it a month or so back, and since it is something that gets discussed from time to time, and since i can't fathom how it could be so.
and building a very bad wall, like a single sheet of 1/4" drywaqll, and testing the in-room response, comparing that to the same with a rigid, high TL wall in place, and taking said very bad wall back out will waste a day or so... but it would be worth the time for the sake of curiosity and the general interest. I don't have an accredited reverb room ala IBM or Riverbank, etc., nor would the tests purport to be up to any official level. i just happen to have acces to two small reverb rooms with a parition/opening and a very low level of absorption / high level of modal activity.
and the test seems reasonable enough, and considering that i must have seen a dozen threads on this topic over my limited time on the web, it seems to be interesting to many. The tests would just intend to take a peek at this singular topic - can a very bad wall mitigate modal response in a room.
take care everybody