I need to design a horn to go from about 80 HZ (my subs are lab 12's) that goes up to about 500Hz, or so...

I have dowloaded the hornresp program, but I must admit that I can't really follow what some of the things it is asking for inputs.

I should also tell you that this is for a PRO cabinet, (I use 3 labs per side) and will be stacked in to a vertical array, of 3-4 units or more.

so where do I start?