Crossover question

[nahmed]

What is the difference between a 2nd order and 3rd order crossover?

[N. Abstentia]

If I remember correctly, a 2nd order is 12db/octave and 3rd order is 18db/octave. Personally, I use 4th order crossovers!

[Feanor]

If I remember correctly, a 2nd order is 12db/octave and 3rd order is 18db/octave. Personally, I use 4th order crossovers!
each higher order above 1st order introduces an additional 90 degree signal phase shift as between the high and low pass.

Hence ...
1st order, 6 db/octave, 0 degrees phase shift
2nd order, 12 db/oct, 90 degrees out of phase;
3rd order, 18 db/oct, 180 degrees;
4th order, 24 db/oct, 240 debrees.

[skeptic]

I hate to be the one to break it to you but.......180 plus 90 equals 270, not 240.

And I thought the schools here in "The States" were bad. :>)

[Beckman]

See the links below:

On crossovers in general:
http://electronics.howstuffworks.com/speaker8.htm

Second order filters:
http://www.owlnet.rice.edu/~elec301/Projects99/digfilt/anasecondorder.html

Crossover related to car audio:
http://www.the12volt.com/caraudio/cross.asp

[Feanor]

I hate to be the one to break it to you but.......180 plus 90 equals 270, not 240.

And I thought the schools here in "The States" were bad. :>)
Just me; I can't blame the schools.