# Crossover types?

Discussion in 'Archived Threads 2001-2004' started by Ed C, Oct 3, 2001.

1. ### Ed C Stunt Coordinator

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Can somebody explain what the difference is between a 3rd-order crossover, a 4th-order crossover, and a 6th-order crossover?
Is there such a thing as a 1st-order, 2nd-order, or 5th-order crossover?
Thanks.

2. ### James Mudler Stunt Coordinator

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3. ### Ed C Stunt Coordinator

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Thanks!

4. ### ling_w Second Unit

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First order = 6dB/oct phase shift = 90 deg @ crossover point
Second order = 12dB/oct phase shift = 180 deg @ crossover point
Third order = 18dB/oct phase shift = 270 deg @ crossover point
Fourth order = 24dB/oct phase shift = 360 deg @ crossover point
Fourth order is equivent to 0 deg phase shift, but 1 wavelength behind.
A 2nd, 3rd, 4th... crossover could be a cascade of lower order crossovers.
Then there are different types of crossovers, some with gentler initial rolloff, other goes for a summed flat response. The Linkwitz-Reily 4th order is -6dB at the crossover freq instead of the usual -3dB.