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Can you say "suckout"?

The reason that some xovers are implemented with one driver reversed is that the xover itself causes a phase change at the xover frequency. As a rule of thumb, the change will be 900 x the order of the xover (e.g 2nd order is 1800, 4th order is 3600, etc) Reversing the tweeter polarity in a 2nd order xover compensates for the 1800 xover phase change.

Theoretically, if you reverse tweeter polarity in these situations you will have the 2 drivers canceling one another at the xover frequency, and the there will be a dip in frequency response. If the drivers and xover were perfectly implemented, there would be a huge suckout.

Personally, I agree with you that connecting the drivers in the correct absolute polarity seems intuitively better. In my experience, I have always preferred systems with all drivers connected in the same absolute phase.

Peter

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