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<blockquote data-quote="Seraphim38" data-source="post: 8237854" data-attributes="member: 638571">First of all, any sub that is fed frequencies below it&#039;s ported enclosure&#039;s tuned frequency enters into an &#039;infinite baffle&#039; sort of environment, meaning that below the port frequency your sub is going to flop around like an epileptic on steroids.Practically, unless you are running a subsonic filter you can run the risk of over-excursion, which can damage your woofer.I did create one competition system where I tuned an enclosure for two suitably chosen drivers down to 18Hz.&nbsp; For me it was a box design challenge to see if I could make it perform well, and in the end it was a tremendously impressive system that didn&#039;t use up thousands of watts to get there.Sealed systems have much higher resonant frequencies and don&#039;t have the porting issue, but they are less likely to be able to extend that low anyway.</blockquote>

[QUOTE="Seraphim38, post: 8237854, member: 638571"] First of all, any sub that is fed frequencies below it's ported enclosure's tuned frequency enters into an 'infinite baffle' sort of environment, meaning that below the port frequency your sub is going to flop around like an epileptic on steroids. Practically, unless you are running a subsonic filter you can run the risk of over-excursion, which can damage your woofer. I did create one competition system where I tuned an enclosure for two suitably chosen drivers down to 18Hz. For me it was a box design challenge to see if I could make it perform well, and in the end it was a tremendously impressive system that didn't use up thousands of watts to get there. Sealed systems have much higher resonant frequencies and don't have the porting issue, but they are less likely to be able to extend that low anyway. [/QUOTE]

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