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Message: <blockquote data-quote="sundownz" data-source="post: 7997009" data-attributes="member: 549523">The main benefit is to increase off-axis response and/or to otherwise shape the response on midrange drivers; which is exactly what zako stated.On a sub-woofer you would *decrease* your cooling (the dust cap is the cover of the air pump after all - without the cap air doesn't pump through the pole vent or internal gap at all) and decrease your SD by the amount of the pole. Also... you are opening an air-leak directly into your enclosure ; even more so on drivers with vented gaps (air directly from the box could come out, through the gap, and out around the phase plug). Also you would open up the gap for debris, especially in car audio, hence the term "dust cap"</blockquote>

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