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<blockquote data-quote="matt_martin87" data-source="post: 7367854" data-attributes="member: 563889">I&#039;m building an SPL box for 2 12 cvr&#039;s in a 06 Impala. He wants the port to face into the cabin. Sd of both subs is ~165 sq in.I&#039;ve been told to use up to 100% of Sd.Here is where I&#039;m running into some difficulties. Both subs and 165 sqin of port can&#039;t fire into the cabin. There isn&#039;t enough room. The most port area I can get is ~65 sq in this way.If I tweak the placement of the subs, I can get all 165 sq in of port firing into the cabin. This requires me to place one of the subs on the side and one facing into the cabin. I worry about phase issues with this but those may be negated by the sheer amount of port area. I also wonder whether having both subs facing into the cabin will make much of a difference than moving one to the side.Have a quick look at the designs and tell me which is better suited for his application.<img src="http://i9.photobucket.com/albums/a63/mathyouakandn/whichdesign.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Both these are 3.5 cubes at 48hz.</blockquote>

[QUOTE="matt_martin87, post: 7367854, member: 563889"] I'm building an SPL box for 2 12 cvr's in a 06 Impala. He wants the port to face into the cabin. Sd of both subs is ~165 sq in. I've been told to use up to 100% of Sd. Here is where I'm running into some difficulties. Both subs and 165 sqin of port can't fire into the cabin. There isn't enough room. The most port area I can get is ~65 sq in this way. If I tweak the placement of the subs, I can get all 165 sq in of port firing into the cabin. This requires me to place one of the subs on the side and one facing into the cabin. I worry about phase issues with this but those may be negated by the sheer amount of port area. I also wonder whether having both subs facing into the cabin will make much of a difference than moving one to the side. Have a quick look at the designs and tell me which is better suited for his application. [IMG]http://i9.photobucket.com/albums/a63/mathyouakandn/whichdesign.jpg[/IMG] Both these are 3.5 cubes at 48hz. [/QUOTE]

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