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Message: <blockquote data-quote="sparkplug121988" data-source="post: 6121392" data-attributes="member: 608609"><p>I am looking to build a box for a single 18". The sub is fully loaded and will be going into a 06 malibu. Im looking to seal the box off from the trunk. I want to do a swithcable port. I want one port around 32hz or so and the other for spl. My question is what should the box size be and port area be? I was told for the btl that 4cf with 100sq of port would be the best. What have you had luck with? Keep in mind that this will be in a trunk of a car so not alot of room.</p></blockquote><p></p>

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