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Old 8th May 2003, 07:05 AM   #1
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Default Looking for simple active XO design

Hi!

I want to modify a car amplifier I have with an additional XO stage. In order to drive my kick-bass drivers in a better frequency range (right now from bottom - 220 Hz), I plan to add an additional high pass in front of the normal XO included inside the amp, using a BB opamp.

I have seen enough designs already, but all of those use a fixed xo frequency. I plan to make it adjustable, like those XOs already present in my amps.

In the formulas for calculating an active high pass the frequency is depending on some capacitance, while I want to rely on an adjustable resistance. Can someone point me in the right direction (probably with complete circuits)?

I already have some OPA604 and 2604 at hand...


Thanks,

Arndt
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Old 8th May 2003, 07:30 AM   #2
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Oh, forgot something:

I want to have a 2nd or 3rd order high pass filter, in other words 12 or 18 or 24 dB...
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Old 8th May 2003, 08:07 AM   #3
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