In Reply to: Re: Reverse attenuation and HF comp. networks, active X-over posted by Wayne Parham on May 22, 2002 at 22:49:21:
Hi Wayne,Maybe I wasn't clear. What I'm using to divide the frequencies
are 18dB VCVS (Sallen-Key) filter stages. To control horn attenuation,
I'm putting a balance pot circuit between the inputs for
high/low (verses left/right). I was planning on putting the
HF comp between the output of the balance buffer and the input
of the HP filter. But now you're going to make me install spice
or write a perl script to verify what you are saying. Seems to
me that at freqs below 1/(2*Pi*Rs*C) (there's that Pi thing again :^),
the divider will work more like a divider because Xc will be > Rs.
Above that freq, the Xc will be less than Rs, hence provide HF
boost. It looks a lot like the one used in your x-overs. Wonder
where I got the idea. )^:Rs
acsii art time: --\/\/\/\/\------
|___||_____| |
|| |
C #
# Rp
#
#
|I got the filter circuits from an old Walter Jung OpAmp Apps book
from when I was in school. Gee, I know the formulas are close,
but I'll have to look them up AGAIN!Thx, Chris
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