The SMS-1 is a great piece of equipment, especially for one sub, or multiple subs nearfield. The problem is the EQ adjustments you make change the response for all the subs connected to the single SMS-1 processor. If you have the subs on 2 or 4 opposite walls, you would really need seperate SMS-1's for each sub, or purchase their higher end model that lets you have seperate EQ settings for each sub.
Fred, also keep in mind those changes on the superchunk graph was just by adding the front corner bass traps. I have not done the rear walls, or floor/wall, or ceiling/wall.
Your correct Casey on Ian's statements, I believe that is one of the reasons he does not believe in EQ methods, just following Dr Toole's paper.
