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DIY & Tutorials
DIY, Audio & Video Tutorials
A rough guide to crossover design
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<blockquote data-quote="Timber_MG" data-source="post: 546799" data-attributes="member: 18"><p>The important thing to understand is that in a minimum phase system the phase and frequency response are correlated. Kind of in a way in that when one derives a function, a constant factor goes missing. If a driver were to have a gradual rise or droop in frequency response, then the phase is impacted as well. Once you have molded that response to fit around a target response, the phase also corresponds to that of the final transfer function of driver + filter response.</p><p></p><p>Which leaves one with that constant (time offset between drivers on axis is typically taken). Often a woofer will be a bit behind a tweeter due to cone geometry. Either one crosses very low so that the constant becomes small compared to the wavelength or one employs an asymmetrical arrangement where one looks to shift the phase + offset of one driver by playing with the filter (often adding or removing an order) so that it matches the target of the filter assumed for the other. Thus one get's phase alignment and filter in one shot.</p></blockquote><p></p>
[QUOTE="Timber_MG, post: 546799, member: 18"] The important thing to understand is that in a minimum phase system the phase and frequency response are correlated. Kind of in a way in that when one derives a function, a constant factor goes missing. If a driver were to have a gradual rise or droop in frequency response, then the phase is impacted as well. Once you have molded that response to fit around a target response, the phase also corresponds to that of the final transfer function of driver + filter response. Which leaves one with that constant (time offset between drivers on axis is typically taken). Often a woofer will be a bit behind a tweeter due to cone geometry. Either one crosses very low so that the constant becomes small compared to the wavelength or one employs an asymmetrical arrangement where one looks to shift the phase + offset of one driver by playing with the filter (often adding or removing an order) so that it matches the target of the filter assumed for the other. Thus one get's phase alignment and filter in one shot. [/QUOTE]
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DIY & Tutorials
DIY, Audio & Video Tutorials
A rough guide to crossover design
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