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<blockquote data-quote="geolemon" data-source="post: 361215" data-attributes="member: 547749">TL&#039;s... theoretically yes, but that&#039;s 1/2 wave theory... and honestly even still couldn&#039;t be as phase-correct as sealed. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gifYou can build them under 1/4 wave theory also, and I haven&#039;t read as much... but they theoretically would seem to face the same phase issues as a ported box then.. with a really big port... only coming within 90 degrees of phase difference.Bandpass boxes have their own inherent delay since ALL the sound is coming from a port (or two)...But you have to match the subs to the enclosures the same way:Sub with a low EBP or high Qts = 4th order (rear sealed chamber bandpass)Sub with a high EBP or low Qts = 6th order (both chambers vented) bandpass.PR&#039;s are like ports, essentially.&nbsp; But the mass of the port dictates the resonant frequency of the PR, rather than the size/length of the port (really the mass of the air and the friction from the pressure mass acting against it) for a vent.So, ported box subs apply here also. //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif</blockquote>

[QUOTE="geolemon, post: 361215, member: 547749"] TL's... theoretically yes, but that's 1/2 wave theory... and honestly even still couldn't be as phase-correct as sealed. [IMG]//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif[/IMG] You can build them under 1/4 wave theory also, and I haven't read as much... but they theoretically would seem to face the same phase issues as a ported box then.. with a really big port... only coming within 90 degrees of phase difference. Bandpass boxes have their own inherent delay since ALL the sound is coming from a port (or two)... But you have to match the subs to the enclosures the same way: Sub with a low EBP or high Qts = 4th order (rear sealed chamber bandpass) Sub with a high EBP or low Qts = 6th order (both chambers vented) bandpass. PR's are like ports, essentially. But the mass of the port dictates the resonant frequency of the PR, rather than the size/length of the port (really the mass of the air and the friction from the pressure mass acting against it) for a vent. So, ported box subs apply here also. [IMG]//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif[/IMG] [/QUOTE]

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