Area of a Circle = r2 x 3.14 The radius of our circle is 1" (half of the diameter). 12x 3.14 = 3.14" Next, we'll multiply this by the port's length, 12". 12" x 3.14" = 37.68 cu. in. So, to get the accurate volume of the enclosure, we'd need to deduct 37.68 cu. in. from the total volume.
111. 2 offers from $97.89. JL Audioy 10SME 10” Single Sealed / Shallow Mount Subwoofer Enclosure. 4.1 out of 5 stars. 227. Amazon's Choice. in Car Subwoofer Boxes & Enclosures. 4 offers from $50.03. Bbox Single 10 Inch Subwoofer Sealed Enclosure - Car Subwoofer Box & Enclosures - Premium Subwoofer Box Improves Audio Quality, Sound & Bass
Pioneer - 12" - 1400 W Max Power, Single 4-ohm Voice Coil, IMPP™ cone, Rubber Surround - Component Subwoofer - BLUE User rating, 4.2 out of 5 stars with 75 reviews. (75)
Recommended dimensions for four 12-inch subwoofers in such an enclosure is between 5-6 cubic feet of airspace for optimal bass response in such genres as rap, hip hop or EDM. If you choose to use a regular port instead, check this subwoofer port calculator for assistance. Bandpass Enclosure. A bandpass enclosure delivers maximum bass response

1. 8 Inch Subwoofers. A typical size for an 8-inch subwoofer is two cubic feet. This means that the box will measure out at around 24 x 18 x 12 inches. This makes it a little larger than other similarly sized subs, but it also has more room inside to move air around and make noise.

The Rockford Fosgate P3D2 in the link below IS a good physical fit, Joel. This SPL Boxes SB212SV Dual ported sub box's internal air space is 1.6 cubic feet per chamber which is slightly smaller than the ported box size Rockford recommends for the P3D2-12, but they will still sound great!

DUAL 12 INCH SEALED SUBWOOFER ENCLOSURE: The Bbox 12 inch dual sealed Pro Audio Tuned subwoofer enclosure is designed for optimum bass response and low frequency reproduction which is ideal for lower profile sound quality subwoofers. Get the most out of your car with a subwoofer designed for power and quality.
ENCLOSURE DIMENSIONS: Since your subwoofer box or enclosure most likely goes into the boot of your car, checking their dimensions is highly important. Enclosure Dimensions Sub cut out:9.125”, mounting depth: 11.5”, Height: 11.75”, Width: 15.87”, Depth: 15.25” › See more product details
Determine the Dimensions of your Speaker Box based on the Calculated Volume. Determine if your Driver works best in a Sealed or Ported Enclosure. Calculate the Displacement Volume for Your Driver. Read the Speaker Box Design Tutorial. Use the Speaker Box Designer to determine the optimal volume for your enclosure. .
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    • 12 inch subwoofer box dimensions