Thank you so much for the info! I tried to download PiAlign, but it looks to be a PC program, and I'm a Mac guy.

What I'd like to do, is to model different sized cabs (just curious to see what can be done/not done) and see how the curves look. For instance, if I tuned the box a little lower, (larger box?) how would that effect the curve?

If you don't mind, I'd appreciate plans for the Four Pi cab. Also, do you recommend any particular type of crossover? I was thinking a second order, but if a simple first order will work, that would be great.

Thanks again for all your help Wayne.

Layne