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Old 29th May 2012, 05:42 AM   #1
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Default X-over Phase shift question

I'm considering the types of 2nd order 2 way crossover to use in a new setup.
Most designs suggest reversing the polarity to negate most of the phase shift.
My question is , is that for the woofer only or does the tweeter polarity need to be reversed as well? Does this apply to the crossover or speakers only?
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Old 29th May 2012, 09:00 AM   #2
AllenB is offline AllenB  Australia
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There are several ways it could be done but the standard way is to simply reverse the connections at the tweeter.

If you were to reverse the woofer as well, you'd be back where you started
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Old 29th May 2012, 10:49 AM   #3
system7 is offline system7  United Kingdom
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Tweeter phase is a very moveable feast. It so depends on the alignment and offset between the woofer and tweeter, which most speaker design simulators allow you to adjust.

The object of the exercise is to keep the two driver's phase tracking near crossover. This makes for good imaging and avoids suckouts in the frequency response.

On a conventional baffle you normally wire in phase. If you time align, as below, out of phase is going to work better:

Click the image to open in full size.

It all greatly depends on how far apart the acoustic centres of the two drivers are. Hopefully a good kit design will have done all this work for you.
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