After conferring with JohnF (thanks, John) who played around with HornResp on my behalf, I have decided to use both of my EVX-180B drivers in a single modified imperial cabinet, as a dedicated subwoofer.  For my mains, I intend to use two of the standard (Steve's modified Jensen design) imperials, with two 15s in each and a high frequency horn (as per Steve's  photos) using a JBL 2441 compression driver.  This should go to 16kHz.  The challenge now is to select drivers that will complement the 2441, both in terms of their frequency response, and the maximum possible SPL (PA application).

Suggestions?

I found two online versions of the spec sheet for the EVX-180B.  I think that 6000 W is a typo.  Power handling on the other sheet lists 1000 W, which I think is a bit more reasonable.

I took the time to draw a CAD model of the imperial in SolidWorks.  Interpreting Steve's plan required a bit of thought, as there are a few examples of redundant or inconsistent dimensions on the plan (maybe these have been changed since the first release?), but I made a best guess as to intent and came up with a dimensionally consistent model.  I then went ahead and started designing my HF lenses - approximating the flare rate using a spline - this is almost but not quite accurate - I will refine this before making the construction drawings.  Overall I think it looks pretty good... the hard part will be developing a method of construction to get the geometry I want.  I'll have to spend some more time thinking about this.  In the meantime, here's the pic:

http://www3.telus.net/public/b7b32310/sean_mains.jpg

-Sean

Your model looks really nice.  They make us learn Solid works as CSM, so seeing it used for something that I find interesting is nice.

In another thread, Steve D seemed to think the front braces could resonate.  You might want to double them up.

Keep up the good work,

Stv