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Old 22nd September 2012, 05:16 PM   #1
dnv is offline dnv  Thailand
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Default Question about active crossover

I don't understand about the section in red block. What are them? Do they relate to cut off freq. May someone clarify it to me,please.
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Old 22nd September 2012, 05:25 PM   #2
AndrewT is offline AndrewT  Scotland
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filter with a limited frequency range.
Some might call it a shelving filter.

The first part outside the red is difficult to get right.

A single pole filter that is buffered such that Rs= zero and Rload = infinity is a standard filter block.
You show a two stage filter where the Rload of the second stage "loads" the first stage such that Rload << infinity.
And the first stage sources the second stage such that Rs>>0.
This results in the cascaded filters NOT performing as two single pole filters with the correct loading.
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Old 23rd September 2012, 03:41 AM   #3
dnv is offline dnv  Thailand
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Thanks. This is from GSI X-1 xover that sold in 70's. Someone said it was one of
the best in that time. That's why I try to figure it out.
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Old 26th September 2012, 06:34 AM   #4
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Depending on the dimensioning this could be either

1.) A simple second order crossover with some driver equalisation

or

2.) A second order symmetrical transient-perfect crossover (i.e. constant voltage crossover)

Regards

Charles
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