With 3 12's in the back, I wouldn't bother with rear fill, and I'd disconnect the factory rear fill speakers. It's more than likely going to be overpowered by the subs, but I guess it comes down to how you set it all up.
How are you powering the new 5.25 splits up the front? Off an amp?



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the JL audio FAQ website has great information on sub enclosures including push-pull isobaric enclosures. But, do you really need an iso box? Are you low on space? You can always mount a sub upside down. I'm not sure how much volume you gain in the box when you do this, but you'll want to figure that into your calculations for box size. I saw a sweet fiberglass enclosure for those subs, buth there were three... Two mounted standard and one inverted to see the basket...

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