Thanks, that's a really interesting way of looking at things. You cleared up my foggy understanding about how boundaries work. Can you simply divide the area in half then to simulate half-space? Would quarter space then mean you could half the length and eighth space mean you can quarter the length? For some reason I just want to be able to do this with decent accuracy without having to use a computer program--I'm still gonna download it though. I can probably compare a table of my results using the Audio Xpress equation to the simulated McBean horn and find my missing constants. It makes me nervous though--a year ago I downloaded an open baffle program that didn't come close to simulating the response I got. I hate to ask for hand-outs, but I've researched my College Algebra and Calc textbooks and I just can't find anything to point me in the right direction. One of you guys should write a "Gormet Cookbook," I hate Mickey-Ds. That would save you from my stupid questions and put more money in your pockets--probably the only useful advice I can give with absolute confidence. Thanks again Mr. Parham and anyone else able to help.