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<blockquote data-quote="helotaxi" data-source="post: 424560" data-attributes="member: 550915">At optimal alignment, that is ususally correct.&nbsp; B4 alignment for ported and 0.707 Qtc for sealed.&nbsp; As you stray away from that, the roll-off rate changes as well.&nbsp; A larger box with a lower Q will roll off more gradually.&nbsp; A smaller box with a higher Q will drop more quickly.The link you posted is for a speaker in an anechoic environment.&nbsp; The car is far from that.&nbsp; Because of the small air volume in the car itself, it will affect the alignment and the Q of the sub.&nbsp; You will get some loading from the air in the car, which can have the effect of lowering the Q.&nbsp; That is why you can get away with a higher Q in the car than in a large room environment.&nbsp; I don&#039;t know of a program that accounts for the loading of the vehicle but I remember that LEAP was working on it (and they have been for some time).&nbsp; There are just so many variables that you can&#039;t really account for when you start working in a small room environment.</blockquote>

[QUOTE="helotaxi, post: 424560, member: 550915"] At optimal alignment, that is ususally correct. B4 alignment for ported and 0.707 Qtc for sealed. As you stray away from that, the roll-off rate changes as well. A larger box with a lower Q will roll off more gradually. A smaller box with a higher Q will drop more quickly. The link you posted is for a speaker in an anechoic environment. The car is far from that. Because of the small air volume in the car itself, it will affect the alignment and the Q of the sub. You will get some loading from the air in the car, which can have the effect of lowering the Q. That is why you can get away with a higher Q in the car than in a large room environment. I don't know of a program that accounts for the loading of the vehicle but I remember that LEAP was working on it (and they have been for some time). There are just so many variables that you can't really account for when you start working in a small room environment. [/QUOTE]

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