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Nice, Alex! Thanks.
To give credit where it's due, I believe your critically damped version
would properly be called a 4th order Linkwitz-Riley filter. Linkwitz and
Riley introduced it to the Audio Engineering Society in the mid 70s in a
paper called "Active Crossover Networks for Noncoincident Drivers." It's
a Q=.5, critically damped filter, down 6dB at Fc, commonly (although
it's not the only way) constructed by cascading two Q=.7 Butterworth
filters.
--
Dennis
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