> what I wish to do is be able to construct a room and be able to see how the sound behaves with specific variables. <
There are room simulator programs like Cara and RPG's Room Optimizer, but they may not be as useful as you'd like. There are also room mode calculators that can sort of predict the problem bass frequencies, but they too are less accurate than actually measuring a real room.
What exactly do you have in mind, and how do you intend to use the information?
--Ethan