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SPL Boxes SB184-212BL

Custom-fit dual 12" sealed subwoofer enclosure — fits 2014-up Chevrolet and GMC Crew Cab trucks

Item # 419184212B

Add custom-fit bass to your Silverado or Sierra with this rugged SPL box.

Find what Fits your vehicle

Add custom-fit bass to your Silverado or Sierra with this rugged SPL box.

Item # 419184212B

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$254.99

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About the SPL Boxes SB184-212BL

Bob Bihlmayer
SPL Boxes' SB184-212BL custom-fit enclosure installs under the rear seat of 2014-up Chevrolet and GMC Crew Cab trucks. This downward-firing box holds two 12" subwoofers of your choice, and its rugged MDF construction and bedliner finish will stand up to the stresses of the truck environment. The enclosure's internal volume is 0.8 feet per chamber with a maximum mounting depth of 7".

SPL Boxes' SB184-212BL custom-fit enclosure installs under the rear seat of 2014-up Chevrolet and GMC Crew Cab trucks. This downward-firing box holds two 12" subwoofers of your choice, and its rugged MDF construction and bedliner finish will stand up to the stresses of the truck environment. The enclosure's internal volume is 0.8 feet per chamber with a maximum mounting depth of 7".

Note: this enclosure only fits Crew Cab trucks; it will not fit Double Cab trucks.

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Product highlights:

  • vehicle-specific downward-firing sealed subwoofer enclosure
  • holds two 12" subwoofers (not included)
  • installs under rear seat of 2014-up Chevrolet and GMC Crew Cab trucks
  • MDF construction with bedliner finish
  • internal volume: 0.8 cubic feet per chamber
  • subwoofer mounting depth: 6"
  • dimensions: 52.75"W x 9.625"H1 x 5.125"H2 x 15"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # SB184-212BL

What's in the box:

  • One vehicle specific sealed enclosure for two 12" subwoofers with spring-post terminals

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More details on the SPL Boxes SB184-212BL

Pat M.

Product Research

Features

Vehicle Compatibility: This custom-fit sealed enclosure is designed specifically to fit select 2014 and later Chevrolet Silverado and GMC Sierra Crew Cab pickup trucks. Please enter your vehicle information to confirm fit.

Mounting Location: The enclosure mounts under the rear bench seat without taking up interior space.

Enclosure: The enclosure is made from durable MDF (Medium Density Fiberboard) that resists flexing and damps resonance. It's covered with a bedliner type material.

Terminals: The wire terminals are spring-posts (two pair) that accept pin connectors or bare wire up to 10-gauge. Inside the enclosure there are 0.205" male quick-slides (will accept 0.205" female quick slides) for both the positive and negative terminals. The wire can also be attached using the nuts holding the quick-slides in place.

Note: Speaker wire is needed to connect the terminals to the subwoofers.

Dual 12" Subwoofers: The enclosure holds two 12" subwoofers in isolated 0.8 ft³ chambers. Once mounted the woofers are down firing.

Mounting: No mounting hardware or speaker wire is included with the enclosure.

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Customer Q&A

3 questions already asked

Q
What is the exact hole size? And outer hole size? I also have the 12tw3/8. Can the manufacturer do a simple cut list with dimensions like the manuals you gave a link for on other equipment?
[ Jimmy  Mar 05, 2023 ]
1 answer
A
Greeting Jimmy, and thank you for your question. The cut out dimeter is listed on the details page at 11 3/16th's. Your TW3_D8 needs a cutout of 11.569 inches. Technically your subs will not fit without you making the cut out a bit larger. We try to put as much of the specifications on our site as possible, but sometimes we miss a thing or two.
[ THOMAS  Mar 05, 2023 ]  Staff
Q
Do the JL Audio 12TW3-D4 fit this box without having to make hole larger?
[ Edgar  Aug 30, 2022 ]
1 answer
A
We reached out but did not get any confirm here sadly on the exact hole cutout size, Edgar. Since these JL Audio 12TW3-D4 subs are too large to fit our other SPL branded pre-fabricated enclosures we can most likely assume that these will not fit here either. Since this IS an MDF box with bed liner covering it would be hard to modify that hole opening too without damaging the finish. IF you are OK enlarging that hole than the JL would be a great call here.
[ Bo  Sep 01, 2022 ]  Staff

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