Crossover question [Archive] - Audio & Video Forums

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nahmed
05-28-2004, 07:14 PM
What is the difference between a 2nd order and 3rd order crossover?

N. Abstentia
05-28-2004, 08:59 PM
If I remember correctly, a 2nd order is 12db/octave and 3rd order is 18db/octave. Personally, I use 4th order crossovers!

Feanor
05-31-2004, 09:17 AM
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
05-31-2004, 10:01 AM
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
05-31-2004, 11:02 AM
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
06-02-2004, 12:28 PM
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.