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>> The Linkwitz-Riley filter is not
>> critically damped and has overshoot.
>
> Yep, I guess that's true once you get above 2nd order. I wonder how a
> Bessel filter compares to Alex's filter? It has the characteristic of
> maximally flat group delay. As I recall, a 4th order Bessel is down
> something like 7.5dB at Fc. Here's a Rane note about them.
>
> http://www.rane.com/pdf/note147.pdf
Interesting. I haven't explored Bessel filters, but from what I can tell
browsing various PDFs on the web (why is everything in PDF format?) a
Bessel doesn't have as sharp or steep a rolloff as a Butterworth, but the
transient response of a Bessel appears to be critically damped; i.e. no
overshoot.
-Alex
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