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<blockquote data-quote="Doxquzme" data-source="post: 8924372" data-attributes="member: 689267">You don&#039;t mention if that box is 2 cu ft net or gross.JL says that the subwoofer should be in a ported enclosure no larger than 1.3 cu ft. The displacement of the driver is roughly .105 cu ft, the port as they list it is around 593 cu ub (31.625x12.5x1.5 =593 cu in or roughly .34 cu ft), which puts the gross internal volume at around 1.75 cu ft.If your box is tuned to 38, it&#039;s tuned too high, and if it&#039;s 2 cu ft, it&#039;s too large.You&#039;re losing everything below 37Hz, likely creating a muddy response comparatively and reducing its power rating considerably.I would actually shoot for around 29Hz tuning on that driver, its fs is quite low at 26.9hz so anything at or above would be great.Something like this.30x14x12.5port opening (on baffle with woofer) roughly 21.875 square inches.port would be 12.5x1.75x30Tuning frequency would be roughly 31 hz.This also assumes a single baffle. I&#039;d actually consider doubling the baffle.</blockquote>

[QUOTE="Doxquzme, post: 8924372, member: 689267"] You don't mention if that box is 2 cu ft net or gross. JL says that the subwoofer should be in a ported enclosure no larger than 1.3 cu ft. The displacement of the driver is roughly .105 cu ft, the port as they list it is around 593 cu ub (31.625x12.5x1.5 =593 cu in or roughly .34 cu ft), which puts the gross internal volume at around 1.75 cu ft. If your box is tuned to 38, it's tuned too high, and if it's 2 cu ft, it's too large. You're losing everything below 37Hz, likely creating a muddy response comparatively and reducing its power rating considerably. I would actually shoot for around 29Hz tuning on that driver, its fs is quite low at 26.9hz so anything at or above would be great. Something like this. 30x14x12.5 port opening (on baffle with woofer) roughly 21.875 square inches. port would be 12.5x1.75x30 Tuning frequency would be roughly 31 hz. This also assumes a single baffle. I'd actually consider doubling the baffle. [/QUOTE]

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