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<blockquote data-quote="hispls" data-source="post: 8711330" data-attributes="member: 614752"><p>12W7 will really want more box volume than you've got now and it may or may not outperform your current 10s. As near as I can make out from the pictures you have 2 problems. First those ports are not an optimum shape (a circle), the narrower you get the less efficient and predictable they become. Second how is the sound meant to get up into the passenger area if the box form fits into the trunk like that and fires to the rear? </p><p></p><p>I've had pretty good luck with sub(s) up and port to the side in trunks. With the caveat that while subs can be crowded close to a hard surface ports want a bit of open space around them to function properly and you really do want to consider plenty of room for the sound wave to get around the box and up front. Firing port and subs forward may work as well but in either case you almost always get some bad standing waves (cancelation of some frequencies) if you don't have the box as far to the rear of the trunk as possible.</p><p>[ATTACH=full]22513[/ATTACH]</p><p></p><p>Ugly box I made from leftover wood to do SPL testing in my old Jeep but this orientation is good for a trunk and about the size you'd need for a single 12 done properly.</p></blockquote><p></p>
[QUOTE="hispls, post: 8711330, member: 614752"] 12W7 will really want more box volume than you've got now and it may or may not outperform your current 10s. As near as I can make out from the pictures you have 2 problems. First those ports are not an optimum shape (a circle), the narrower you get the less efficient and predictable they become. Second how is the sound meant to get up into the passenger area if the box form fits into the trunk like that and fires to the rear? I've had pretty good luck with sub(s) up and port to the side in trunks. With the caveat that while subs can be crowded close to a hard surface ports want a bit of open space around them to function properly and you really do want to consider plenty of room for the sound wave to get around the box and up front. Firing port and subs forward may work as well but in either case you almost always get some bad standing waves (cancelation of some frequencies) if you don't have the box as far to the rear of the trunk as possible. [ATTACH type="full" alt="22513"]22513[/ATTACH] Ugly box I made from leftover wood to do SPL testing in my old Jeep but this orientation is good for a trunk and about the size you'd need for a single 12 done properly. [/QUOTE]
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