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Low Earth Orbit
DIY Audio
PMA - 60; New arrayable double 12 and horn.
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<blockquote data-quote="Carl Klinkenborg" data-source="post: 214355" data-attributes="member: 12770"><p>I have found that high port velocity tends to be of itself practically inaudible at the levels usually required to produce it. The main effects it produces are increased distortion and port compression (lower output). I always begin with a port area equal to the speaker's Sd (rarely possible) and work down from that size until the port fits the box keeping an eye on port resonances within the pass band and, of course, port velocity. Some of the car audio kids go to velocities approaching 40m/s, but with with their 10kW 12" drivers in boxes tuned to 12Hz, and their 20kW amps, they seem to get away with it...<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p>Wherever possible I like to stay the right side of 10m/s even with ports properly flared on both ends to provide best symmetry of airflow to avoid port rectification.</p></blockquote><p></p>
[QUOTE="Carl Klinkenborg, post: 214355, member: 12770"] I have found that high port velocity tends to be of itself practically inaudible at the levels usually required to produce it. The main effects it produces are increased distortion and port compression (lower output). I always begin with a port area equal to the speaker's Sd (rarely possible) and work down from that size until the port fits the box keeping an eye on port resonances within the pass band and, of course, port velocity. Some of the car audio kids go to velocities approaching 40m/s, but with with their 10kW 12" drivers in boxes tuned to 12Hz, and their 20kW amps, they seem to get away with it...;) Wherever possible I like to stay the right side of 10m/s even with ports properly flared on both ends to provide best symmetry of airflow to avoid port rectification. [/QUOTE]
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PMA - 60; New arrayable double 12 and horn.
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