In Reply to: RE: It is and it isn't. posted by DrChaos on February 21, 2012 at 17:28:38:
Dr. Chaos,
Good question.
One simple way to visualize the difference begins by looking at the sine wave coming from each driver individually, at the crossover frequency.
On a phase-coherent speaker that is not time-coherent, these two identical waves line up over each other peak-to-valley-- as they are 'in phase'.
But if you go back to the beginning, you will see one wave (the tweeter's) began one full wavelength sooner than did the woofer's. And therefore the woofer's copy of that wave will also stop one full wavelength late.
A time-coherent speaker means that both waves started and stopped at the same moment. And this automatically gives phase coherence, because the two waves will then overlap everywhere. The opposite is not necessarily true-- phase coherence never implies time-coherence.
Best regards,
Roy Johnson
Designer
Green Mountain Audio
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