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<blockquote data-quote="bbeljefe" data-source="post: 8155680" data-attributes="member: 655960">I don&#039;t know that you&#039;re going to benefit from porting into a closed chamber. It would change the Fb of a sealed box but so will making the sealed box larger.&nbsp; Correct me if I&#039;m wrong but, to realize any benefit from a ported chamber, you need to have that chamber ported into the listening environment at some point.But basically, what you&#039;re describing (save porting into an unused chamber) is a dual chamber bass reflex box. And those are relatively simple to build in one alignment. You simply take the Vb of a ported enclosure for a given driver, and then split that air space into two separate boxes with one of them being 2/3 of the original total and the other being 1/3. You use three ports, all of which are the same size and length as modeled in the original box. The 2/3 box houses the driver and two ports. One vents into the listening environment and the other into the 1/3 box. The third vents from the 1/3 box into the listening environment.Here&#039;s a bit more detailed explanation of them:<a href="http://www.diysubwoofers.org/prt/dual_chamber.htm" target="_blank">The Subwoofer DIY Page - Dual-chamber ported systems</a></blockquote>

[QUOTE="bbeljefe, post: 8155680, member: 655960"] I don't know that you're going to benefit from porting into a closed chamber. It would change the Fb of a sealed box but so will making the sealed box larger. Correct me if I'm wrong but, to realize any benefit from a ported chamber, you need to have that chamber ported into the listening environment at some point. But basically, what you're describing (save porting into an unused chamber) is a dual chamber bass reflex box. And those are relatively simple to build in one alignment. You simply take the Vb of a ported enclosure for a given driver, and then split that air space into two separate boxes with one of them being 2/3 of the original total and the other being 1/3. You use three ports, all of which are the same size and length as modeled in the original box. The 2/3 box houses the driver and two ports. One vents into the listening environment and the other into the 1/3 box. The third vents from the 1/3 box into the listening environment. Here's a bit more detailed explanation of them: [URL="http://www.diysubwoofers.org/prt/dual_chamber.htm"]The Subwoofer DIY Page - Dual-chamber ported systems[/URL] [/QUOTE]

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