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Re: Tech people: can it sometimes be good to wire certain drivers out of phase?

Posted by Drew Eckhardt (A) on March 9, 2007 at 12:31:22

In Reply to: Tech people: can it sometimes be good to wire certain drivers out of phase? posted by hukkfinn on March 8, 2007 at 17:32:30:

For each order, high-pass filters vary from 0 to 90 degrees of phase lead (45 degrees at the pole) as they move from pass to stop band and low-pass filters vary from 0 to 90 degrees of phase lag (45 degrees at the pole).

With second order filters the high and low-pass outputs are 180 degrees out of phase at all frequencies. The polarity of one output must be inverted if you want any output.

First order cross-overs have a 3dB peak 15 degrees below axis; third order cross-overs have a 3dB peak 15 degrees above axis. Inverting the polarity of one output flips the peak (but means the first order cross-over is no longer transient perfect).

Fourth order filters have the inputs and outputs 360 degrees out of phase which is to say in-phase for continuous tones. Flipping one output will eliminate most output.

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