Its been a while since I read it, but as I recall a finite number of studies were done because it was mostly an experimental one, with a little simulation. But what I remember was that he had missed some important configurations and the ones that I recommend were not among them.Maybe I should reread it, but as I've posted, I did my own studies and my results were not exctly the same as Todds. I remeber rereading his to see how it was that we disagreed and found that he hadn't tested what I found to work best. In other words he was drawing broad conclusions based on a limited investigation and my work did not cooberate his.
If I get a chance I will run the four subs in corners against four radndom subs and I think that you will find that they are not much different. And then I'll run three subs at random and show that this is only marginally worse than the four corners, with one fewer sub.