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<blockquote data-quote="Umbra" data-source="post: 8421873" data-attributes="member: 658055">I read somewhere today ideally you&#039;d want the distance between the end of the port and the back wall at least the length of the port diameter. I did a bunch of research and crunched a bunch of numbers and right now my plan is to widen the box to get to ~2.75 cubes (I&#039;m going to try to add to it, but I may just scrap it and start fresh), put two 4&quot; tubes in it, and drop a pair of 10s in it. I&#039;m playing with the numbers in Torres, but I can&#039;t follow that rule and get the tuning down to ~35Hz. Then I thought about what you said.I understand diameter, port area, and length and how it affects tuning, but not much beyond that. I&#039;m looking for some trick to extend the length without it sounding terrible. I don&#039;t have room to have any of the port be external because I&#039;ve only got about 4&quot; between the box and the trunk lid, so I either need to somehow manipulate the effect you mentioned to my advantage, put 90 degree couplers on the pipe either inside or outside the box, or give up the idea of using aeros and design a slotted box.Here&#039;s what I&#039;ve got so far:<img src="http://i.imgur.com/kcKTbmc.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />If anyone has any ideas or notices anything amiss with this design please chime in.</blockquote>

[QUOTE="Umbra, post: 8421873, member: 658055"] I read somewhere today ideally you'd want the distance between the end of the port and the back wall at least the length of the port diameter. I did a bunch of research and crunched a bunch of numbers and right now my plan is to widen the box to get to ~2.75 cubes (I'm going to try to add to it, but I may just scrap it and start fresh), put two 4" tubes in it, and drop a pair of 10s in it. I'm playing with the numbers in Torres, but I can't follow that rule and get the tuning down to ~35Hz. Then I thought about what you said. I understand diameter, port area, and length and how it affects tuning, but not much beyond that. I'm looking for some trick to extend the length without it sounding terrible. I don't have room to have any of the port be external because I've only got about 4" between the box and the trunk lid, so I either need to somehow manipulate the effect you mentioned to my advantage, put 90 degree couplers on the pipe either inside or outside the box, or give up the idea of using aeros and design a slotted box. Here's what I've got so far: [IMG]http://i.imgur.com/kcKTbmc.jpg[/IMG] If anyone has any ideas or notices anything amiss with this design please chime in. [/QUOTE]

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