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<blockquote data-quote="hoss" data-source="post: 630024" data-attributes="member: 549860">passive radiators act as a sort of port.&nbsp; they work in the same manner, just that one is more obvious than the other.&nbsp; a PR vibrates just like a sub, they are tuned to a certain freq/application, and they roll off the low end just like a port(24Db/octave).a membrane would consist of something like a verio-vent.&nbsp; a covered port, or some other means of porting intended to slow down air oscillations in order to help control impedence rise.&nbsp; sort of like trying to confuse the woofer into thinking that it is in a sealed enclosure.your question about different tunnings in a box, sounds like a bandpass box //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gifhaving identical woofers in different boxes with different tuning might yield some odd results.&nbsp; more than likely, interference and cancellation.hope that helps some //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</blockquote>

[QUOTE="hoss, post: 630024, member: 549860"] passive radiators act as a sort of port. they work in the same manner, just that one is more obvious than the other. a PR vibrates just like a sub, they are tuned to a certain freq/application, and they roll off the low end just like a port(24Db/octave). a membrane would consist of something like a verio-vent. a covered port, or some other means of porting intended to slow down air oscillations in order to help control impedence rise. sort of like trying to confuse the woofer into thinking that it is in a sealed enclosure. your question about different tunnings in a box, sounds like a bandpass box [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] having identical woofers in different boxes with different tuning might yield some odd results. more than likely, interference and cancellation. hope that helps some [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]

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