Reversing tweeter polarity is a quick check performed with even order filters to test the overall phase relationship that
exists between the tweeter and woofer. The goal is to achieve a fairly deep, symmetrical null at the crossover fre-
quency when the tweeter polarity is reversed. If one is witnessed when the tweeter polarity is reversed, then it can be
assumed that a good phase relationship exists when the tweeter is connected with normal polarity.
Reverse Tweeter Polarity
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So the values for our proposed parallel notch filter is a 9.4uF capacitor, .26mH inductor, and a 14 ohm resistor. Un-
like the impedance compensation filter discussed earlier, this filter is harder to generate from just design formulas.
It is best to use some means of measurement to validate the result. Please note that adding this notch filter to the
existing BR-1 crossover will change the filter roll off and will necessitate a low pass filter redesign.
System Impedance and Phase