For analysis of low frequency modal response (one of the most critical acoustical issues in small rooms) we use a number of tools - see a
sample summary here.
The first step is a basic check of the room ratios (chosing a
rectangularized room shape with the same volume as the room in
question). This then gets refined up to an analysis using sophisticated
BEM Software (Boundary-Element-Method). With this software, loudspeaker
positioning as well as listening position can be taken into
consideration, and the pressure distribution in the room at different
frequencies in three dimensional space can be studied. This then allows
determination of the most efficient positioning of low frequency
absorbers.
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