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SPL Boxes SB212

Dual sealed 12" subwoofer enclosure

Item # 419SB212

Item # 419SB212

In stock

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About the SPL Boxes SB212

We all know how a good subwoofer can enhance your musical enjoyment, but not everyone wants to build their own box. SPL Boxes to the rescue! These heavy-duty enclosures can take the punishment of the car environment, with rugged 3/4" MDF construction to give your sub plenty of support. Attractive and tough charcoal carpet protects the box from nicks and dings, while gold-tipped spring terminals hold your speaker wires securely. This SB212 box holds two 12" subs in a sealed enclosure.

Product highlights:

  • sealed enclosure for two 12" subwoofers
  • 3/4" MDF construction
  • gray carpet covering
  • internal volume: 1.2 cubic feet per chamber
  • cutout diameter: 11.25"
  • dimensions: 32.5"W x 13.125"H x 12.75"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # SB212

What's in the box:

  • Sealed enclosure for two 12" subwoofers

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Crutchfield response

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More details on the SPL Boxes SB212

Pat M.

Product Research


Design: The SB212 is an unloaded, sealed enclosure for two 12" subwoofers. It's constructed of ¾" MDF (medium-density fiberboard) and covered in charcoal colored carpet.

Internal Box Volume: The enclosure has two separate chambers, each with a volume of 1.2 ft³.

Terminals: The wire terminals are spring-posts, two pair; one pair mounted on each side of the enclosure. The spring terminals will accept pin connectors and bare wire up to 12-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.

Brackets: Brackets for securing the enclosure in your vehicle are recommended.

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Customer Q&A

2 questions already asked

Would 2 Rockford Fosgate Punch P3 D4's fit these?
[ Gabe  Jan 20, 2023 ]
1 answer
Greetings Gabe, and thank you for your question. The SPL SB212 is a recommended box for the P3D4 and D2s.
[ Thomas J.  Jan 21, 2023 ]  Staff
What is the best sub box to use on a pontoon? Sealed or ported? Right now I have two 10â?? subs in ported boxes and want to add two 12â??s. Not sure if I want to put all of them in ported boxes.
[ Joe  Oct 04, 2022 ]
1 answer
Well there is a lot of personal preference involved in sub box choice Joe, there are advantages to both. I would not advise using something like this SPL Boxes SB212 however, it is not suited for a marine environment. We have a couple options in the 12" size, first link below is the Roswell marine ported box. This is also MDF construction, but has a coating and some additional marine protection to suit water exposure. Since space on deck is always a primary concern, you could even consider getting the best of both worlds so to speak. The second link below is a pre-loaded Wet Sounds Revo 12 PSE. This is a sealed box (making it much more weather proof) but has a 12" passive radiator. This essentially gives the bass of a ported box but with the marine advantages of sealed. These are a great small footprint option, and you could even go with one or two additional to maximize your bass on deck!
[ Bo  Oct 04, 2022 ]  Staff

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