605 time delay crossover

Great Work fellows!
The reason for the Bessel filter is that it is the only filter that it has flat time delay .With all the others, Butterworth , LR, etc. the time delay changes with freq. With a Bessel filter , the one, and most important thing is to have a LF. load Z that terminates the filter with a flat freq resp. Hence the Zobel.
Please check the time delay with a scope and the test tone from my web site

www.donpatten.com

Don

This was an epic project.... I updated all the links so it could live on and hopefully provide some others with the heaps of knowledge that Don P and others shared with us.

Not much is left of Don's website, but there is a useful capture on the internet archive from 2013: donpatten.com/X-Over.html