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<blockquote data-quote="fivepoints" data-source="post: 7914734" data-attributes="member: 645559">if you are any good at math you could pic up this book and figure out the formulas on fourth oders i got the book and it would take to long for me to type up the info and yess there is a lot mor then a 3:1 ratio i am thinking 40hz may still be a tad low depending on the subs most are tuned 50-80 hz for spl comps for sound quality they tune them around 40-60&nbsp; if you did not have a hatch back throw the sub in a sealed box and cut some tube the length suggested by this book and put them in the rear deck ware the speaker go turns the trunk in to a band pass box but they got to be tuned high like 80-90 to do so casue of the area of the trunk is closer to a .75 to a 4 ratio with new trunks they got now. any ways back on subject if talking how close you can get them to face rear that&#039;s tricky. you got to design the box on paper then do the measurements&nbsp; then compare and see if the port is to close to the rear hood.&nbsp;&nbsp; if it is it will never play right if not to close like 8 inch from for a 4 inch port etc. also are you sure you want that weight on those shock&#039;s in the back a buddy of mines car bottoms out with a single 12 in it in a wrx hatch wagon.<a href="http://www.valorebooks.com/textbooks/loudspeaker-design-cookbook-6th-edition/9781882580330?utm_medium=referral&amp;amp;utm_campaign=Froogle&amp;amp;utm_source=Froogle&amp;amp;date=10/30/12&amp;amp;buy=3&amp;amp;gclid=CLv-tpOfqrMCFdEWMgodTygAKw" target="_blank">Loudspeaker Design Cookbook 6th Edition | 9781882580330 | 1882580338</a></blockquote>

[QUOTE="fivepoints, post: 7914734, member: 645559"] if you are any good at math you could pic up this book and figure out the formulas on fourth oders i got the book and it would take to long for me to type up the info and yess there is a lot mor then a 3:1 ratio i am thinking 40hz may still be a tad low depending on the subs most are tuned 50-80 hz for spl comps for sound quality they tune them around 40-60 if you did not have a hatch back throw the sub in a sealed box and cut some tube the length suggested by this book and put them in the rear deck ware the speaker go turns the trunk in to a band pass box but they got to be tuned high like 80-90 to do so casue of the area of the trunk is closer to a .75 to a 4 ratio with new trunks they got now. any ways back on subject if talking how close you can get them to face rear that's tricky. you got to design the box on paper then do the measurements then compare and see if the port is to close to the rear hood. if it is it will never play right if not to close like 8 inch from for a 4 inch port etc. also are you sure you want that weight on those shock's in the back a buddy of mines car bottoms out with a single 12 in it in a wrx hatch wagon. [URL="http://www.valorebooks.com/textbooks/loudspeaker-design-cookbook-6th-edition/9781882580330?utm_medium=referral&utm_campaign=Froogle&utm_source=Froogle&date=10/30/12&buy=3&gclid=CLv-tpOfqrMCFdEWMgodTygAKw"]Loudspeaker Design Cookbook 6th Edition | 9781882580330 | 1882580338[/URL] [/QUOTE]

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