Something I've been working on for years in various iterations. Someday I might even finish them.
The intent here was to build as small and efficient an Array as possible that could give a Tannoy DC12i a run for the money. It clocks in around 96 dB, W, m. The smaller size of the Tannoy DC12i (basically the same volume as a JBL 120Ti) is still quite tantalizing, as is the superior imaging. But, alas, it isn't a JBL. Nor can it upgrade from a three-inch high frequency compression driver to run a state of the art four-inch high frequency compression driver if desired (quite frankly, I find the 435Be to be quite sufficient here). To be fair, the Tannoy isn't really at the same price point.
Greg's 1200 Array remains my all time favorite JBL system; custom or otherwise.