Making a custom crossover?

[Crystal]

I need to make a highpass crossover at 45hz and a lowpass crossover on the
same circuit at 90hz. How can I go about doing that?

[MOSFET]

This is addressed in this group's FAQ. Go to:
http://www.mobileaudio.com/rac-faq/

MOSFET

"Crystal" > wrote in message
. 97.131...
>I need to make a highpass crossover at 45hz and a lowpass crossover on the
> same circuit at 90hz. How can I go about doing that?