Yes, I meant Earl K, the crossover wizard.
I recently picked up a pair of crossovers that were parted out of a pair of 9842s. I think what I'll do is use them for the components and work on some tests.
At this point, I doubt that the M14s can be improved upon, short of driver refubs and replacing oxidized caps in the stock XO design. I have done a TON of reading on this, and it is still amazing to me that so little is published about how these XO designs truly work. It is apparent to my old, rusty ears though that the entire package was very carefully designed to work together. If only such dedicated engineering and manufacturing still existed.