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In Reply to: RE: "The fact that some speakers show it up more...that is a different set of questions in my mind" posted by TomLarson on June 10, 2007 at 13:58:20
Not necessarily. What unclestu is pointing out is that speakers by their very nature distort phase information. Any driven oscillator - mechanical or electrical - vibrates out of phase with an applied driving force. There is a time delay between the force being applied and the response - which is nothing but plain old inertia. That time delay is a function of frequency, which means the time-domain response of a speaker is typically very different from the signal driving it.
Speakers are designed to produce as flat as possible a frequency response, with little regard for phase response. There's a very very good reason for that - we are close to deaf to phase distortions, but very sensitive to frequency response distortions. A speaker with terrible phase response may still be very resolving in many other ways - there's no reason to expect it to be "out of focus" for anything other than phase information.
This is yet another reason why worries about polarity can't go anywhere without a better understanding. What aspects of time-domain distortion should we worry about? Which are audible? How do they affect the illusion of real acoustic sound we're striving for?
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