There isn't a Pi model with the Delta Pro's, but is it possible to make a modified Theater Pi with the Delta Pro? More specifically, is it recommended? Should I use PiAlign to compare the two drivers and get a feel for what the tradeoffs would be for the smaller Delta Pro box? I am concerned about the low frequency performance, but if the Pros gave me similar low frequency performance in a smaller box (hence higher SAF :) it might be worth the extra cost.
-Ian