Based on what I have learned from this forum (and others) I built a rather large, JBLish 3-way speaker. Design goal was to have horn loading from 200 Hz up. The midhorn is the one designed by Wayne Parham (Pi Speakers). Thanks to Speakerdave I will shortly have a pair of JBL2012H's for the midhorn (currently using 20123H's which are not optimal for this application).
Computer Drawing of the speaker concept:
Enclosure Design:
The numbers to the left of the concept speaker are the center-to-center distances and the height from the floor to the midpoint between the MF and HF drivers.
Temporary XO/DSP is provided by a Peavey VSX26 unit. I added a protective capacitor (39 uF, ~510 Hz 1st order) and L-pad attenuation circuit (-6 dB) to the HF driver. The Peavey VSX26 is known to add hiss if used to attenuate the signal, thus I provided most of the required attenuation passively (remainder is added at the amp).
I will be working on the XO/DSP settings, which is likely to be continual learning process. Goal of the design is for my ability - somewhat limited as I am electronically challenged - to dial in the speakers to be the weak link.
Thanks for looking.