Belva BBX212BL (BLUE)

3.70 Total Cu Ft - Dual 12" 3/4" MDF Ported Subwoofer Box Enclosure with Custom Blue Baffle

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• 12" Dual Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard Construction
• Blue Finish Panel
• Durable Black Carpet
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals
• Total box volume: 3.7 cubic feet

Learn more about the bbx212bl

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This item has been discontinued


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Belva Subwoofer Boxes with Polyfill and 3/4-inch MDF

Built for Bass

You've got an awesome subwoofer there, pal. But where's it gonna go? You can't just throw that thing in the trunk and call it a day. Don't worry, Belva's got your back. With superior construction, great features and everything you need for bass, you'll be ready to pass up that entry-level box you've been eyeballing.

Belva Subwoofer Boxes are CARB Phase 2 Compliant

You get quality boxes with solid 3/4" MDF because nothing else will do the job right. You want to flex your windshield, not your box's innards. You get polyfill built into the box, making sure your subs perform perfectly. On top of that, you get a box that's CARB Phase 2 Compliant, meaning your box won't emit as much nasty formaldehyde as the competition. Better for your bass and better for you.

Belva MDF 3/4-inch Thickness

Look, nobody buys a subwoofer and says, 'Aw man, I just want a teeny bit of thump.' Naw man, you want something that kicks you in the chest, but you need a box that's gonna put up with it. That's where Belva comes in. While other brands use less-than-optimal 1/2-inch MDF, we've got 3/4-inch MDF to make sure you get all the bass you can handle. Why risk a busted box? Belva's the obvious choice when it comes to giving your sub a good home and giving you the low end you're looking for.

Belva MDF 3/4-inch Thickness

General Features:

  • 12" Dual Ported Subwoofer Enclosure
  • Blue high gloss front face board
  • Covered in black carpet
  • Durable 3/4" Medium Density Fiberboard (MDF) construction
  • Subwoofer mounting depth: 14 1/2"
  • Subwoofer cutout diameter: 11 1/4"
  • Box volume: 1.85 cubic feet (per chamber)
  • Total box volume: 3.7 cubic feet
  • Dimensions: 16"D x 35"W x 16.25"H
  • Also available in Black and Red
  • Authorized Internet Dealer
  • 30-Day Return Policy

Port Specifications:

  • Rectangular Slot Port
  • Number of ports: 2
  • Port volume: 0.18 cubic feet (per port)
  • Total port volume: 0.36 cubic feet
  • Estimated port tuned frequency (fb): 35 Hz
  • Port dimensions: 1.5"Width 12.5"Depth

Specifications & Details

Box/Enclosure specifications
Subwoofer Size
Subwoofer Cutout Shape
Round / Circle
Box Type
Number of Subwoofers
Box Style/Shape
Cutout Diameter or Length
Maximum Speaker Depth
Total Box Volume
3.7 cubic feet
Box Volume (Each Chamber)
1.85 cubic feet
Wood Thickness
Number of Terminals
Terminal Type
Spring posts (banana clip ready)
Box Exterior Color
Box Finish
Tuning Frequency
35 Hz
Port Details
Number of Ports
Tuning Frequency
35 Hz
Port Diameter
Port Length
Warranty and Return Policy
Parts Warranty Duration
Not warranted
Labor Warranty Duration
Not warranted
Warranty Provider

Item Details


Model Number:




Internal SKU:


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Customer Ratings & Reviews

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Customer Reviews

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Good box!

It handles my sub woofers pretty well! I'm surprised it is holding up so greatly! Highly recommend it to anyone!

By Ermin on January 27, 2014


found this helpful.

Great box

I love this sub box. It looks & sounds amazing I am so happy I got it . If you want a box that looks and sounds really good you should get this box . U will love it as much as I love mine !!!!

By Brad on April 23, 2014


found this helpful.

Great box but it's to big

I would recommend this product, I like it alit except it's to big to fit in my trunk and had to put it in my back seat, so make sure you measure before you buy a box

By Nick on April 12, 2015 Checkmark Icon Verified purchase


found this helpful.

Great product and price

Product quality great and just as described. Quick shipping. Installed and sound quality is amazing

By Stace on January 5, 2017


found this helpful.

Belva BBX212BL (BLUE)

Sounds good for a prefab box but if you want to get the best out of your speakers build a box to there spec's but for the cheap subwooffers I put in this box for a buget build I did for my sister this box is great.

By Anonymous on May 25, 2018 Checkmark Icon Verified purchase


found this helpful.

Wow!!! Excellent box

I am now on box number 3 for my subs. This box has brought my love back to my system. Insane how much a box can change it and it looks amazing.

By Anonymous on July 8, 2019


found this helpful.

Look/Sound Good

Sturdy construction and is even insulated on the inside. It has good looks and connectors for the speaker wires also. I would purchase this brand again.

By Anonymous on August 1, 2018 Checkmark Icon Verified purchase


found this helpful.

Belva BBX212BL (BLUE)

This box is amazing. Pros: It is a very nice box, has very nice terminals on the side of the box, and is very well built and very strong. Cons: It is pretty heavy but that is because it is so strong and well built, and because it has the white stuff lining the inside makes it hard to get the terminals out to wire them.

By Anonymous on June 2, 2018


found this helpful.

Great box with room for small improvements

I put a pair of Alpine Type R's in here and they sounds great! The box came in perfect condition, and on time. One of the first things I noticed was the wire terminal seemed to be pretty low quality, but are mounted very well. The pictures don't show this, but mine came with a logo screwed in on the corner of the blue/front part of the box. The only BIG con is that the port is very rough and sharp. Overall this is a good box and I do not regret putting this hefty chunk of goodness in my trunk.

By Gabriel on April 6, 2017 Checkmark Icon Verified purchase


found this helpful.

Great vox

The box is made perfect and go's with my speakers. I would definitely recommend 100%

By Dev on March 31, 2017


found this helpful.


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