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Message: <blockquote data-quote="Papermaker85" data-source="post: 8467159" data-attributes="member: 572595">that is a quasi series tuned 6th order. the more typical 6th order im sure you know has a poredt front and rear chamber that are completely isolated.. they are quite a bit more efficient over the standard 4th order.typically a standard 4th order does well with woofers that are at home sealed while 5th order does will with woofers that like to be ported. the only impressive bandpass i've hear to date was a 6th order</blockquote>

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