Broke down. Got a duplex.

[Alien_Shore]

Here's an FR graph of the 604E. These FRs are "barefoot" as Don likes to say, with no XO (just a 4uf HP on the horn).
I used gated impulse, and aligned the gate time for both measurements LF and HF:



There are some crazy phase curves going on with these, but I left them out of this chart since it clutters it up so badly. That, and I have no clue what I'm looking at or how to interpret phase graphs yet.