I'm halfway through your Crossover document. This is very interesting stuff and I understand most of it (whooo hoo! good job!), I was planning to make a 3-way project using a 1st order butterworth. Now I think I'd like to use your Theater series Four Pi plans (if you wouldn't mind emailing them to me).

Question: How does a compression driver sound compared to a high eff cone driver in the 1-6k region, the only place I've heard compression drivers is at shows or concerts where it is way too loud to evaluate sound quality.

Nother question... I've noticed in a lot of Eminence's woofers (specially the LF ones) there is a big dip in the reponse between 30hz and 60hz. Whats up with that?

Also, would there be any advantage to using the Delta 15LF instead of the 15A in them Four Pi's?

Oh, also do you reccomend any parts suppliers for caps and resistors?