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Message: <blockquote data-quote="SSS 18734" data-source="post: 5713044" data-attributes="member: 559710">Theoretically, a 0.25 should be noisy. Not at lower volumes, though. Although it really doesn't always work out that way. I was running a 4 inch port in a 1.75 cubic foot box with a 12" Pioneer 2000SPL. There was definitely noise at loud volumes, but you couldn't hear it at the headrest.And yes, keep that port at least 4" away from the back wall.</blockquote>

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