[kmoser]

Danny,
Please explain why overlapping filters are not being used in speaker designs.  For example, in a two-way design, the woofer could have a low pass with 12db roll off at say 1500hz and the tweeter a high pass roll off at say 1000hz.  Both speakers have 89db senstivity.

[Danny Richie]

Well, the ideal response is for them to cross where they are each 6db down and sum flat. If they play on top of each other then it will cause a peaked area across that whole range.