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In Reply to: Very common to confuse the two. posted by Presto on December 17, 2009 at 16:56:26:
Maybe just semantics, but the most commonly used 4th order these days is probably the Linkwitz Riley alignment, and it is phase-coherent throughout the frequency spectrum, meaning that if you check the driver outputs at any frequency, not just at the crossover frequency, they will be in phase.
But as you say, the 4th order crossover does have more group delay, so the high frequencies would ultimately be rotated by a full 360 deg in reference to the low frequencies. It is modeled as an all-pass filter. The summed outputs will have constant amplitude throughout the frequency spectrum since they are always in phase with each other, but not with the input except at very low frequencies.
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Follow Ups
- 4th order LR crossover is phase coherent at all frequencies - Slider 11:56:22 12/18/09 (1)
- Right, but - Presto 18:16:20 12/18/09 (0)
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