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<blockquote data-quote="helotaxi" data-source="post: 4606973" data-attributes="member: 550915">At sub bass frequencies, there are no &quot;inbox reflections&quot; or anything of that sort to worry about.&nbsp; There are no &quot;waves&quot; inside the box at all.&nbsp; The frequencies in question have a 20+ ft wavelength.&nbsp; The air inside the box simply pressurizes as a whole and rarifies as a whole as the cone moves.&nbsp; You&#039;re thinking WAY to much about this and assuming that concerns exist where ther are none.You could build an extremely low tuned ported enclsure and accomplish whatyou want but it will have 2 characteristics that will be detrimental to your goal.&nbsp; First it will have to be HUGE.&nbsp; Second the port will have to be HUGE making the gross size of the box that much bigger.&nbsp; To be playing the freqs that you&#039;re looking for, you&#039;re looking at a tuning of 20hz, probably lower.&nbsp; Power handling will not be any better than with a large sealed box because the enclosure would have to be very large to keep the output around tuning from being suppressed below what you would get from a large sealed enclosure at that frequency.&nbsp; Yes, that&#039;s what happens when you put a sub in a ported enclosure tuned much lower than it wants to be tuned, output actually drops (which kinda defeats the purpose to going ported in the first place).&nbsp; You have to make the box HUGE to boost that low output shelf back to somewhat normal levels.&nbsp; You can&#039;t get around Hoffman&#039;s Iron Law, even with a ported enclosure.&nbsp; You can have efficiency, low frequency extension and a small box, pick two.</blockquote>

[QUOTE="helotaxi, post: 4606973, member: 550915"] At sub bass frequencies, there are no "inbox reflections" or anything of that sort to worry about. There are no "waves" inside the box at all. The frequencies in question have a 20+ ft wavelength. The air inside the box simply pressurizes as a whole and rarifies as a whole as the cone moves. You're thinking WAY to much about this and assuming that concerns exist where ther are none. You could build an extremely low tuned ported enclsure and accomplish whatyou want but it will have 2 characteristics that will be detrimental to your goal. First it will have to be HUGE. Second the port will have to be HUGE making the gross size of the box that much bigger. To be playing the freqs that you're looking for, you're looking at a tuning of 20hz, probably lower. Power handling will not be any better than with a large sealed box because the enclosure would have to be very large to keep the output around tuning from being suppressed below what you would get from a large sealed enclosure at that frequency. Yes, that's what happens when you put a sub in a ported enclosure tuned much lower than it wants to be tuned, output actually drops (which kinda defeats the purpose to going ported in the first place). You have to make the box HUGE to boost that low output shelf back to somewhat normal levels. You can't get around Hoffman's Iron Law, even with a ported enclosure. You can have efficiency, low frequency extension and a small box, pick two. [/QUOTE]

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