Adire Brahma 15"
Stryke HE15"
Lambda TD15X

http://home.pacbell.net/lordpk/curve.jpg

What does this tell me from a performance point of view?
Ideally, if we didn't have a bell shape, the woofers
impedance would be flat and that would yield flat frequency
response within the drivers limits of course? true/false

The peak of the bell curve, this is the problematic frequency
range for the woofer ? true/false

I'm trying to optimize my driver selection and I'm just
curious if I should place alot or very little emphasis on
this curve?