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Low Earth Orbit
DIY Audio
Cardioid using aperiodic ports (a la Fulcrum Acoustics)
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<blockquote data-quote="Kevin McDonough" data-source="post: 207180" data-attributes="member: 10402"><p>hey all</p><p></p><p></p><p>really interested in this kind of thing......</p><p></p><p><a href="http://www.audioxpress.com/article/fulcrum-acoustic-unveils-new-ccx-subcardioid-coaxial-loudspeaker" target="_blank">http://www.audioxpress.com/article/fulcrum-acoustic-unveils-new-ccx-subcardioid-coaxial-loudspeaker</a></p><p></p><p><a href="http://www.fulcrum-acoustic.com/products/cardioid-subwoofers/" target="_blank">http://www.fulcrum-acoustic.com/products/cardioid-subwoofers/</a></p><p></p><p></p><p>Using aperiodic ports at the rear of the speaker to create passive cardioid dispersion. </p><p></p><p>Anyone any links with more info to see exactly how this is done? </p><p></p><p>Forgetting about the cardioid aspect for a bit, as I understood it these kinds of "vents" lowered the impedance spikes of cabs and made them perform more like sealed boxes or infinite baffles, by giving a restive "air leak". </p><p></p><p>But a sealed box doesn't have the greatest bass response obviously. So does that mean if I was doing a sub version, I'd really need to have traditional ports as well as the vents to get the driver to play low enough? Or would just adding a very large vent area be enough to accomplish the amount of tuning that a port would otherwise create?</p><p></p><p></p><p></p><p>K</p></blockquote><p></p>
[QUOTE="Kevin McDonough, post: 207180, member: 10402"] hey all really interested in this kind of thing...... [URL]http://www.audioxpress.com/article/fulcrum-acoustic-unveils-new-ccx-subcardioid-coaxial-loudspeaker[/URL] [URL]http://www.fulcrum-acoustic.com/products/cardioid-subwoofers/[/URL] Using aperiodic ports at the rear of the speaker to create passive cardioid dispersion. Anyone any links with more info to see exactly how this is done? Forgetting about the cardioid aspect for a bit, as I understood it these kinds of "vents" lowered the impedance spikes of cabs and made them perform more like sealed boxes or infinite baffles, by giving a restive "air leak". But a sealed box doesn't have the greatest bass response obviously. So does that mean if I was doing a sub version, I'd really need to have traditional ports as well as the vents to get the driver to play low enough? Or would just adding a very large vent area be enough to accomplish the amount of tuning that a port would otherwise create? K [/QUOTE]
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Cardioid using aperiodic ports (a la Fulcrum Acoustics)
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