15" RE SX 4th/6th order BP recommendations?

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I'm thinking about playing around with some designs to gain a little more output from the old SX, however I don't know much when it comes to the BP designs. Obviously volumes/tunings are CRITICAL to the survival of the sub hehe, but not sure where a good starting off point would be? Current box is a low end monster with 3.837^3 @ 26.62 hz and 64.75^2 port area ran off a old JBL 1200.1 //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif . I honestly wouldn't change much but need to get out in the shop and do something as after 4-5 years the box is starting to separate.

I was thinking something like 6th Order Rear 3.5^3 @ 25 Front 1.25^3 @ 60 ?? Look decent? Room for improvements?

 
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