Weseixas wrote: "There is no such thing as a fast 15 inch woofer operating @ 400 Hz IMO ! Consider how directional the speaker will be @ 400 Hz and it's large mass ( relative ) with it's accompanying cone coloration ..."
Four hundred hertz is probably more than two octaves below that woofer's upper rolloff frequency, so it will be plenty "fast" enough to do its job. The radiation pattern will be fairly wide at that frequency, and the cone will probably still be pistonic.
Weseixas: "...based on what you have expressed so far, it would be baffling to not have a high degree of nasality."
It is quite possible to build a horn system that doesn't have a "nasal" or "horn-like" signature. Part of the solution lies in the design of the horn itself, and part lies in the crossover. Having heard several Bill Woods designs over the years, I have every reason to believe what Macrojack says about his speakers.
Duke
dealer/manufacturer