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<blockquote data-quote="John Roberts" data-source="post: 41449" data-attributes="member: 126">Re: What is the audible effect of 180 polarity change between HF and mids?As I suggested in my earlier post... the wrong absolute polarity between passbands is the lesser evil than an amplitude bump or suck out in the transition region. Note: Ignoring driver phase shift, transition region interference and relative polarity is more of an issue for even order filters than odd, while the ever popular L-R uses an even order filter alignment and same polarity. When the driver phase shift and amplitude loss is already significant they must be added to the filter response. This is contrary to my understanding and experience. I will remind all that the knobs on equalizers are calibrated in amplitude of boost/cut, while EQ tweaks do alter the phase response too. Phase errors are most audible when they cause constructive or destructive interference that changes amplitude.That said it all matters, I would just not discount the importance of amplitude response, while it matters how measured. Impulse or transient (amplitude) response could be quite different than steady state sine wave measurements, where 360&#039; or 720&#039; of phase shift are indistinguishable from 0&#039;. &nbsp;JRPS: Our brains are pretty sensitive to arrival time of transient events, so this is another possible variable in the mix.</blockquote>

[QUOTE="John Roberts, post: 41449, member: 126"] Re: What is the audible effect of 180 polarity change between HF and mids? As I suggested in my earlier post... the wrong absolute polarity between passbands is the lesser evil than an amplitude bump or suck out in the transition region. Note: Ignoring driver phase shift, transition region interference and relative polarity is more of an issue for even order filters than odd, while the ever popular L-R uses an even order filter alignment and same polarity. When the driver phase shift and amplitude loss is already significant they must be added to the filter response. This is contrary to my understanding and experience. I will remind all that the knobs on equalizers are calibrated in amplitude of boost/cut, while EQ tweaks do alter the phase response too. Phase errors are most audible when they cause constructive or destructive interference that changes amplitude. That said it all matters, I would just not discount the importance of amplitude response, while it matters how measured. Impulse or transient (amplitude) response could be quite different than steady state sine wave measurements, where 360' or 720' of phase shift are indistinguishable from 0'. JR PS: Our brains are pretty sensitive to arrival time of transient events, so this is another possible variable in the mix. [/QUOTE]

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