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Characteristics of a diffuse sound field


I am designing a manikin head for recording and am interested in HRTF's.  I have run into a bit of a shortfall on information relating to what constitutes a "diffuse sound field". 

I would like someone to answer this question from two audience viewpoints....

1) the layman.   How is one to find a suitable "room" for creating a reverberant environment such as a closet, empty classroom, cafeteria, or empty basketball stadium to conduct informal, but effective HRTF studies using manikin dummy models?  

2) the scientist.  What is the definition or characteristics of a truly diffuse sound field useful for experimentation with HRTF's?

Thanks in advance

Phil Mc Cand.le.ss