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<blockquote data-quote="tommyk90" data-source="post: 5405124" data-attributes="member: 545293">Not necessarily.Bandpasses require a lot of tuning and testing.USUALLY (but not always) making the sealed chamber larger will lower the tuning.USUALLY (but not always) making the ported chamber larger will raise efficiency.As for ratios, that really depends on the woofer.&nbsp; I&#039;ve seen anywhere from 1/4 to 1/1 ratio for a sealed chamber versus a ported counterpart.&nbsp; For instance, while a 15&quot; sub in a normal ported box needs 4 cubes, the sealed chamber on a 4th order would be anywhere from 1 cube to 4 cubes depending on the design/sub/desired end result.Where as the front chamber can be anywhere from 2/1 to skys the limit.&nbsp; i.e. 15&quot; sub needs 4 cubes, so the ported chamber can be anywhere from 8 cubes on up, but can be less.Basically it boils down to plotting a design down on paper and just trying it.</blockquote>

[QUOTE="tommyk90, post: 5405124, member: 545293"] Not necessarily. Bandpasses require a lot of tuning and testing. USUALLY (but not always) making the sealed chamber larger will lower the tuning. USUALLY (but not always) making the ported chamber larger will raise efficiency. As for ratios, that really depends on the woofer. I've seen anywhere from 1/4 to 1/1 ratio for a sealed chamber versus a ported counterpart. For instance, while a 15" sub in a normal ported box needs 4 cubes, the sealed chamber on a 4th order would be anywhere from 1 cube to 4 cubes depending on the design/sub/desired end result. Where as the front chamber can be anywhere from 2/1 to skys the limit. i.e. 15" sub needs 4 cubes, so the ported chamber can be anywhere from 8 cubes on up, but can be less. Basically it boils down to plotting a design down on paper and just trying it. [/QUOTE]

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