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DIY & Tutorials
DIY For Audio
New high efficiency speaker build
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<blockquote data-quote="Shonver" data-source="post: 86571" data-attributes="member: 34"><p>I also measure from a listening elevation.</p><p></p><p></p><p></p><p>I use a measurement vs. simulated comparison of the summed response to verify the Hilbert Bode process (tailing off, HBT and relative acoustic offset) before adding components. In my experience, if this part is not done correctly, one gets the kind of problems you describe. I actually struggled with this for a long time (could not get that deep reverse null, only a mild depression), until I saw that I was not taking sufficient care in deriving the minimum phase response of the drivers. The alternative is of course to not bother with minimum phase and use the raw measurements (with phase wrapping around a few times); one can make it look better, though, by subtracting time-of flight from the bafffle.</p></blockquote><p></p>
[QUOTE="Shonver, post: 86571, member: 34"] I also measure from a listening elevation. I use a measurement vs. simulated comparison of the summed response to verify the Hilbert Bode process (tailing off, HBT and relative acoustic offset) before adding components. In my experience, if this part is not done correctly, one gets the kind of problems you describe. I actually struggled with this for a long time (could not get that deep reverse null, only a mild depression), until I saw that I was not taking sufficient care in deriving the minimum phase response of the drivers. The alternative is of course to not bother with minimum phase and use the raw measurements (with phase wrapping around a few times); one can make it look better, though, by subtracting time-of flight from the bafffle. [/QUOTE]
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DIY & Tutorials
DIY For Audio
New high efficiency speaker build
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