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Message: <blockquote data-quote="SPL KID" data-source="post: 7216495" data-attributes="member: 570464">1) make it as wide as you can and still fit it in the trunk.2) average 12 is 8 inches deep and you need a minimum of 3 inches off the rear of the sub so at minimum your box need to be 11 to 12 inches deep internally. So a 15 inch long box is actually correct as a starting point.3) If you have skill you want to add some corner 45's inside the enclosure for better air flow and to optimize performance.4) Figure your enclosure with the design program to 3.0 cu ft for average box for 12 with the 45's OR 2.25 with out the 45's. Then go to port calculating portion and figure in your port.  35-40 tune is good average for SPL and SQ. Do not put a 45 in the port corner without tapering the opposite corner to match angle degree and width.</blockquote>

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