I once ran across an article about subwoofer placement that showed a number of room response graphs (maybe 8 to 12 of them) based on different room placements of both single and dual subwoofer setups. I believe these were mathematically calculated (as opposed to being based on physical experiments).

I forgot to bookmark the article, or somehow the bookmark didn't "take". Does anyone know the article I am referring to, and could you please direct me to it?

Thanks in advance to anyone who might be able to help.