Being a horn lover, this looks like a hell of a speaker to me. The D' Appolito arrangement of the Double Impact with the greater ease and efficiency of horns. It looks like a good idea, but of course it's all about the sound.
Tekton Polycell15
103db made with a different array which is more like a horn or waveguide. 15" dual woofers. He has it as a pro audio product. Seems ideal for flea-watt home use as well.
http://www.tektondesign.com/tekton-pro-audio.html