Thanks, Wayne! I was close for much of the input, but I modeled the horn in free space, while merely guessing at the VTC. The T/S look more like the Delta 10, though (preferred for its availability). Does the VTC in your model include the 1/4" spacer, and does the axial length include the throat depth?Is there any universal advantage to modeling in 1/8th space? If a design is intended for live SR, I'm thinking that 4xPi would be more realistic, as it would be the worst-case scenario for any venue setup.
I'm not up to trying a basshorn just yet! The Midhorn is challenge enough for a beginner, and the Input Parameter page still resembles a Greek crossword puzzle....