Box for Infinity Kappa 692.5i 6x9's

[Flare]

I want to build a box for these because my car has no real enclousure in the rear, they just get mounted, so they won't have any area of air to compress or anything for the bass. If anyone knows how big the box to build should be, like the volume or whatever, or has any ideas, any help would be great. Thank you.

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[mwess 10+ year member]

6x9 boxes i have saw were like 8x11 or so and a few inches deep