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Seeking "Crossover Networks For Dummies," please

Hello, Gang,
I would very much like to read a thread which is a kind of primer on speaker crossover networks. I do understand that this topic encompasses a lot of complicated material, including electronics and physics!
Still, I'd like to know more about this topic. It would help me to understand some of the opinions and controversies I've read here over the years.
What factors or "philosophy" might cause the designer to choose, say, a second order network over a first order network? I've seen people on this forum post things like, "I cannot listen to anything other than a totally time coherent and phase coherent, first order network." On the other hand, there are much loved and highly regarded speakers out there that use second order and fourth-order networks!
Anyway, I'd love to understand more about this topic.
Thanks!
rebbi

Showing 1 response by ngjockey

ngjockey
1,042 posts
 
Wiki is a good place to start and the reference links seemed unbiased.

http://en.wikipedia.org/wiki/Audio_crossover

Never understood the "time and phase coherent" argument myself when one side is 90 degrees out of phase and all the other positioning and design issues. I wouldn't presume to argue with Dunlavy and Thiel and I've heard their remarkable results but I've also heard enough to know that a complex question deserves more than simple dogma. The simplest is to keep the xovers beyond the vocal frequency range, where our ears are most sensitive and wherever those lines are drawn, but that's rarely practical and involves other compromises.

Inductors are probably the worst offenders in passive xovers and they get correspondingly bigger for lower frequency, low pass filters.
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