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DIY Audio
What did i do wrong?
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<blockquote data-quote="Uwe Riemer" data-source="post: 213452" data-attributes="member: 394"><p>First you need to learn how to do a meaningfull measurement, those strong dips in coherence in the DUT`s passband are concerning.</p><p>Put the box in the air, something like 2m should be sufficient and take a measurement in the nearfield, let´s say 30cm away, halfway between the cone and the port.</p><p>Get rid of the crossovers first and don´t forget to hit the peak finder button. The correct reference delay is important, if the measurement process uses Windowing. You found the correct reference delay, when the phase trace stays flat near zero in the middle of the passband.</p><p></p><p>The empty cavity for Mid/High is not helping like the others said already. It might help to fill this cavity with damping material.</p></blockquote><p></p>
[QUOTE="Uwe Riemer, post: 213452, member: 394"] First you need to learn how to do a meaningfull measurement, those strong dips in coherence in the DUT`s passband are concerning. Put the box in the air, something like 2m should be sufficient and take a measurement in the nearfield, let´s say 30cm away, halfway between the cone and the port. Get rid of the crossovers first and don´t forget to hit the peak finder button. The correct reference delay is important, if the measurement process uses Windowing. You found the correct reference delay, when the phase trace stays flat near zero in the middle of the passband. The empty cavity for Mid/High is not helping like the others said already. It might help to fill this cavity with damping material. [/QUOTE]
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