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<blockquote data-quote="helotaxi" data-source="post: 4603387" data-attributes="member: 550915">If you&#039;re recommending a ported box tuned to the high 30&#039;s, ummm, no, you obviously don&#039;t.&nbsp; Even Alpine recommends a lower tuning, and my experience has shown the manufacturer spec enclosures are usually a little small and tuned a little high.&nbsp; Better SPL, which is what most people want.&nbsp; Tuning higher than that is only going to make the response peak bigger and steepen the rolloff below that.&nbsp; The effect would be to cut the lows even more, which is definitely not what he was looking for.There&#039;s no reason that sub shouldn&#039;t be able to go well below the audible spectrum in-car in a sealed box.&nbsp; It isn&#039;t going to really take your breathe away because it&#039;s still just a 10, but it&#039;ll still ba able to get down there.&nbsp; Cabin gain will help it out a lot in that regard.&nbsp; Pretty much any sub will be able to go below the audible range sealed in a car.</blockquote>

[QUOTE="helotaxi, post: 4603387, member: 550915"] If you're recommending a ported box tuned to the high 30's, ummm, no, you obviously don't. Even Alpine recommends a lower tuning, and my experience has shown the manufacturer spec enclosures are usually a little small and tuned a little high. Better SPL, which is what most people want. Tuning higher than that is only going to make the response peak bigger and steepen the rolloff below that. The effect would be to cut the lows even more, which is definitely not what he was looking for. There's no reason that sub shouldn't be able to go well below the audible spectrum in-car in a sealed box. It isn't going to really take your breathe away because it's still just a 10, but it'll still ba able to get down there. Cabin gain will help it out a lot in that regard. Pretty much any sub will be able to go below the audible range sealed in a car. [/QUOTE]

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