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<blockquote data-quote="Bennett Prescott" data-source="post: 57050" data-attributes="member: 4">Re: High Frequency Compression Driver EvaluationSome more detail that Roberto was kind enough to supply:&quot;If an image is worth a thousand words, several images are worth even more… I am attaching a small GIF I have made. It shows the wavefront shape at different frequencies from 2 to 20 kHz, at the exit of a DE980 (I have deliberately excluded the phase plug area). As you can see, the wavefront is orthogonal to the duct wall and has the shape of a circular arc, with very small variations.When the exit angle is small, there is not a big difference between a shallow spherical cap and a flat wavefront. If the driver radiates inside a plane wave tube, the wavefront becomes flat in a short distance, at least below the cutoff frequency of the first higher order mode.&quot;[ATTACH]152079[/ATTACH]<img src="http://www.bcspeakers.com/images/marketing/webmaterial-dnd/DE900_wavefront_shape.gif" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /></blockquote>

[QUOTE="Bennett Prescott, post: 57050, member: 4"] Re: High Frequency Compression Driver Evaluation Some more detail that Roberto was kind enough to supply: "[I]If an image is worth a thousand words, several images are worth even more… I am attaching a small GIF I have made. It shows the wavefront shape at different frequencies from 2 to 20 kHz, at the exit of a DE980 (I have deliberately excluded the phase plug area). As you can see, the wavefront is orthogonal to the duct wall and has the shape of a circular arc, with very small variations. When the exit angle is small, there is not a big difference between a shallow spherical cap and a flat wavefront. If the driver radiates inside a plane wave tube, the wavefront becomes flat in a short distance, at least below the cutoff frequency of the first higher order mode.[/I]" [ATTACH=CONFIG]152079.vB5-legacyid=6221[/ATTACH][IMG]http://www.bcspeakers.com/images/marketing/webmaterial-dnd/DE900_wavefront_shape.gif[/IMG] [/QUOTE]

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