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<blockquote data-quote="Art Welter" data-source="post: 26581" data-attributes="member: 52">Re: Crossover Polarity QuestionProper phase using a passive crossover depends on the interaction of the voice coil, with all the capacitors, resistors and coils in the circuit.Putting in a different speaker with different T.S. parameters as you did will affect the acoustic crossover frequency. The phase difference between the LF and HF at crossover may have shifted enough that now there is no correct polarity choice.In other words, the phase response will be wrong using either polarity. Each polarity will be slightly different, but neither will cause a complete null at the crossover point as it would with a proper crossover alignment when polarity is reversed.Even though the components in a passive crossover may suggest a second order (12 db per octave) slope, the actual acoustic crossover may be closer to 18 or 24 dB per octave, in which case the phase difference may occur over such a narrow band as to be difficult to detect. Even with a 1/3 octave RTA, the dip can occur between ISO centers, and still look like a flat response through the crossover region.</blockquote>

[QUOTE="Art Welter, post: 26581, member: 52"] Re: Crossover Polarity Question Proper phase using a passive crossover depends on the interaction of the voice coil, with all the capacitors, resistors and coils in the circuit. Putting in a different speaker with different T.S. parameters as you did will affect the acoustic crossover frequency. The phase difference between the LF and HF at crossover may have shifted enough that now there is no correct polarity choice. In other words, the phase response will be wrong using either polarity. Each polarity will be slightly different, but neither will cause a complete null at the crossover point as it would with a proper crossover alignment when polarity is reversed. Even though the components in a passive crossover may suggest a second order (12 db per octave) slope, the actual acoustic crossover may be closer to 18 or 24 dB per octave, in which case the phase difference may occur over such a narrow band as to be difficult to detect. Even with a 1/3 octave RTA, the dip can occur between ISO centers, and still look like a flat response through the crossover region. [/QUOTE]

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