I see the enclosure should be spec'd at 1.02cf. Not sure if you'll notice a difference, but I always made sure my enclosures were within .1cf of the manufacturers recommendation.
http://www.rockfordfosgate.com/suppo...ew=1#knowledge <----you can then go to woofer box advisor and it will give you dimensions/specs or you can modify your own and it will calculate it for you.