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Message: <blockquote data-quote="bbeljefe" data-source="post: 8165955" data-attributes="member: 655960">The difference, regardless of box type, is that a box designed for sound quality has a wider and more flat response curve while an SPL box is designed to produce huge acoustical gains within a narrow bandwidth. The trade off there is that SPL boxes roll off steep above and below tuning.And sealed boxes can't be SPL boxes, because they do not produce any acoustical gains. That said, they're okay for sound quality except that they have to be huge in order to reach down to the sub bass region.</blockquote>

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