Looking for simple active XO design

Cradle22 · 8th May 2003, 07:05 AM

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

Cradle22 · 8th May 2003, 07:30 AM

Oh, forgot something:

I want to have a 2nd or 3rd order high pass filter, in other words 12 or 18 or 24 dB...

arthur · 8th May 2003, 08:07 AM

www.rane.com
model 22 ,23

8th May 2003, 07:05 AM	#1
Cradle22 diyAudio Member Join Date: Jan 2003 Location: Dortmund, Germany	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 __________________ ************************ A Sacrifice For Freedom

8th May 2003, 07:30 AM	#2
Cradle22 diyAudio Member Join Date: Jan 2003 Location: Dortmund, Germany	Oh, forgot something: I want to have a 2nd or 3rd order high pass filter, in other words 12 or 18 or 24 dB... __________________ ************************ A Sacrifice For Freedom

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8th May 2003, 08:07 AM	#3
arthur diyAudio Member Join Date: Oct 2001 Location: .	www.rane.com model 22 ,23

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