Live sound placement paper

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A while back I found an excellent paper on live audio speaker placement. I can't remember what it was called or who wrote it but it was a reputed author.

It showed proper subwoofer placement, and what happens with various placements with polar graphs. I especially remember the polar response graph showing the response when two subs are placed on either side of a stage, strongly resembling a certain part of the male anatomy.

I am writing an instruction manual for the system I am building and I want to cite it. Any other references to good papers on live sound would be appreciated

Thanks guys!
 
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