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<blockquote data-quote="CarAudioGuru" data-source="post: 4966782" data-attributes="member: 600532">Testing subwoofers is actually very interesting.These articles and webpages tell a lot more about vented enclosures.<a href="http://www.ddaudio.com/dd/caraudio/enclosureInfo/portInfo.asp" target="_blank">http://www.ddaudio.com/dd/caraudio/enclosureInfo/portInfo.asp</a>A REALLY good one for anyone building or designing subwoofers<a href="http://www.diysubwoofers.org/prt/" target="_blank">http://www.diysubwoofers.org/prt/</a>And for you SPL guys, this article is really good<a href="http://www.diysubwoofers.org/car/caraudiospl.htm" target="_blank">http://www.diysubwoofers.org/car/caraudiospl.htm</a>Now if you MIS-align a vented box, things get really ugly FAST right at FsB (vent frequency) of the enclosure.But typically SPL guys are ALWAYS building Mis-Aligned *chebyshev&quot; type enclosures - on purpose, thats why they POUND!But, as you read you&#039;ll see that a port actually moves as much air as the woofer, if not more.And as the woofer moves less, the port moves more.&nbsp; Depends on design, tuning, port dimensions, etc.Super important to design your vented boxes correctly.Hope that helps</blockquote>

[QUOTE="CarAudioGuru, post: 4966782, member: 600532"] Testing subwoofers is actually very interesting. These articles and webpages tell a lot more about vented enclosures. [URL="http://www.ddaudio.com/dd/caraudio/enclosureInfo/portInfo.asp"]http://www.ddaudio.com/dd/caraudio/enclosureInfo/portInfo.asp[/URL] A REALLY good one for anyone building or designing subwoofers [URL="http://www.diysubwoofers.org/prt/"]http://www.diysubwoofers.org/prt/[/URL] And for you SPL guys, this article is really good [URL="http://www.diysubwoofers.org/car/caraudiospl.htm"]http://www.diysubwoofers.org/car/caraudiospl.htm[/URL] Now if you MIS-align a vented box, things get really ugly FAST right at FsB (vent frequency) of the enclosure. But typically SPL guys are ALWAYS building Mis-Aligned *chebyshev" type enclosures - on purpose, thats why they POUND! But, as you read you'll see that a port actually moves as much air as the woofer, if not more. And as the woofer moves less, the port moves more. Depends on design, tuning, port dimensions, etc. Super important to design your vented boxes correctly. Hope that helps [/QUOTE]

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