Hi bullitt5094 - you mentioned the following:
"the transducer centers are a 1.5ft from the side walls and 2.5ft from the rear wall."
Since the DI speakers are 12" wide and ~18" deep, going from the transducer centers that would mean you have a about a foot to the side walls from speaker edge and a foot to the front wall (wall behind speakers and in front of the listener) from the back of the speaker.
If this is right, essentially, the speakers would be corner loaded. In such a setup I believe that you preferred a class D amp over a tube amp.
Thanks for sharing!
Mike
Audio Archon - Tekton dealer