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Molded JMC Box (12MJDB)

Dual 12" Custom Designed Molded Plexi-Glass Style Ported Enclosure

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This item has been discontinued

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Molded JMC Box (12MJDB)

Dual 12" Custom Designed Molded Plexi-Glass Style Ported Enclosure

$99.99

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High-Performance Streetwires Speaker Wire

25 ft. of 12 Gauge speaker cable with twisted pair construction for improved power flow and fine-stranded copper windings.

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  • Works with most 12" subwooofers. We recommend smaller magnet subwoofers (eg. Kicker CompVR, JL Audio 12W1v2, MA Audio MA121XQ, Clif Designs CD120W)
  • Front-air ported dual subwoofer enclosure
  • Professional patented design box
  • Front air ported speaker box (vent and cubic feet not required)
  • Fits most cars and SUVs
  • Speaker boxes are designed to enhance the deep bass response of woofer or subwoofer enclosures
  • Enclosures are specifically designed and front air ported to provide the best bass response possible
  • 3/4" MDF Construction
  • Durable Black Carpeting
  • Plexiglass front air ported window
  • Cutout diameter: 11-1/4"
  • Mounting depth: 6-1/4"
  • Dimensions: 28-1/4"L x 15-1/8"H x 16" D (Top) x 17-1/4" D (Bottom)
Port Specifications:
  • Round port
  • Number of ports: 2
  • Port volume: .02 cubic feet (per port)
  • Total port volume: .04 cubic feet
  • Port dimensions: 4-3/4"Diameter 6-1/4"Depth (per port)

Speaker Box / Enclosure Specifications

Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
12"
Subwoofer Cutout Shape
This is the shape of the enclosures cutout hole and defines the style of subwoofer that can be installed.
Round / Circle
Box Type
Represents the style of the enclosure. Be sure to purchase the appropriate enclosure type and internal volume that will be compatible with your subwoofer's recommendation.

Sealed - Sealed boxes are those that have no holes or vents in it. The only hole in a sealed box is where the subwoofer is installed. Smaller sealed boxes require more power than a larger sealed box. They provide a tight, accurate bass, while the larger sealed enclosures provide a "boomier" and louder bass.

Ported / Vented - Ported/Vented Enclosures provide an even boomier, louder bass, but less accurate then a small, sealed box. Ported enclosures typically require more airspace per sub and also less power output from an amplifier to perform correctly.

Bandpass - Bandpass enclosures make subwoofers perform efficiently, but loose. The bass is not as "boomy" as a ported enclosure nor as punchy as a sealed enclosure. Bandpass enclosures work well with lower to mid-level subwoofers.
Ported Bandpass
Number of Subs/Speakers
This value represents the number of speakers or subwoofers that the enclosure accommodates.
2
Box Style/Shape
The box style or shape refers to the actual shape of the box. Square and rectangular boxes are straight-edged boxes on all sides, whereas hatchback and truck style enclosures feature an angled front or back design that allows for installation in places short on depth such as single cab pickup trucks. You can also use such enclosures in hatchback cars or other vehicles where space is a premium. Tube and cylinder shaped boxes were made popular by Bazooka and are a great option for those looking for a nice amount of bass without sacrificing lots of space. They may even fit in locations that slim truck boxes cannot fit in. If the enclosure is vehicle specific, we encourage you to read the product description to find out which vehicles the enclosure is made for.
Square/Rectangle
Cutout Diameter or Length
The actual diameter of the hole in the subwoofer box. Length is the measured length per side of a square subwoofer or speaker opening.
11-1/8"
Maximum Speaker Depth
Your subwoofer or speaker must not exceed this dimension in order to properly mount in this enclosure.
6-1/4"
Total Box Volume
The internal volume measurement in cubic feet before subwoofer magnet displacement.
0.82 cubic feet
Box Volume (Each Chamber)
This is the total air space inside each chamber of the empty subwoofer enclosure. By matching this value with the recommended air space of the subwoofer, you will be able to know if the subwoofer will match this box.
0.41 cubic feet
Height
The height of the item, measured from top to bottom, in inches.
15"
Width
The width of the item from left to right (side-to-side) measured in inches.
28"
Depth
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
15"
Second Depth
The second depth is used only when the box is slanted or angled. This value is the top measurement and it is measured in inches.
17-1/4"
Wood Thickness
The thickness of the wood the enclosure is made of, measured in inches.
3/4"
Number of Terminals
The number of terminals the enclosure has. Each terminal represents 1 positive and 1 negative.
2
Terminal Type
Spring clip terminals work best with bare wire connections with small-gauge speaker wire, or pin-type connectors.

Binding post terminals are a sturdier, more versatile type of speaker terminal. Because binding post terminals are are threaded, you can tighten them down against the wire or connector for a tight, clean connection. The most popular style of binding post terminals is known as a "5-way binding post". This type can accept bare wire, or any of the common speaker wire connectors. Binding posts with the option to be used with banana clips are even more versatile

Spring posts are a hybrid of the two. Instead of using a thread and "screwing" them tight, they use a spring to allow the wire to fit and tighten against the terminal.

Binding posts
Box Exterior Color
The color of the enclosure's exterior/outer finish.
Black
Box Finish
The material used on the outside of the box. Most boxes are carpeted to prevent exterior scratches; however vinyl is popular as it can often be color-matched to a near exact look of your leather factory interior.
Carpet
Tuning Frequency
Compatible Vehicle Make and Model
The model of vehicle that this vehicle specific product is designed for. Please keep in mind that engine variations can affect the compatibility of the products.

Port Details

Number of Ports
The number of ports the enclosure has.
2
Tuning Frequency
Port Diameter
The outside diameter of the port. Check the product's owner's manual for the recommended port diameter for your sub.
4-3/4"
Port Length
The length of the included port tubes. Many tubes are cardboard and may be cut to the length recommended by the sub's manufacturer. Check your product's owner's manual for the recommended port length for your sub.
6-1/2"

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
43%
4 Star
29%
3 Star
14%
2 Star
14%
1 Star
0%

Average Attribution Rating

Durability
4.7
Value
3.9
Features
4.0
Design
4.6
Usability
4.0
Chance

Lancaster, CA

Overall
Durability
Value
Features
Design
Usability
It's Cool

June 14, 2009

All my friends say that thix is the coolest box they have ever seen. The funny thing is that my box cost half as much as theirs. Very sturdy and worth it.

3 of 4 found this helpful

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Suliaman

Lathrop, CA

Overall
Durability
Value
Features
Design
Usability
Amazing box

July 13, 2007

I bought this box for my 2 kicker cvrs which i also bought from this site and they sound excellent together. Get this box if you want yours subs to look cool and hit hard.

2 of 2 found this helpful

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Andrew

La Follette, TN

Overall
Durability
Value
Features
Design
Usability
box

March 9, 2010

put the right subs in this box and it can get loud and worth the money not to bad for a prefab either

1 of 2 found this helpful

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Roger Seth

Cave Creek, AZ

Overall
Durability
Value
Features
Design
Usability
Don't Order This

January 26, 2010

This product is no longer what you see in the photo. Sonic is being supportive of the problem, but the manufacturer no longer makes the product like this and now the 2 cones are solid black, mounted onto the plexiglass with self tapping screws, and really pretty ugly.

Install was interesting since the box is sealed on the back, so connecting cables was rough, then it came with no screws for mounting anything, and the fiberglass didn't have proper predrilled holes for the screws, so they just kinda stick out instead of being able to drop flat with the fiberglass. The fiberglass cut wholes are also terribly tore up, like a poor drillbit was used that left ridged edges that are "covered up" like makeup on a zit with these black plastic cones.

I did get 3 years of warranty free for the problem, so I guess if I have problems I'll just use the warranty to get something that works.

1 of 2 found this helpful

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Andrew

Escondido, CA

Overall
Durability
Value
Features
Design
Usability
Pretty good..

December 22, 2006

I would consider this a bandpass, not a sealed as there are two chambers and one is ported. Compared to almost all other bandpass boxes I've heard, this one can produce higher frequencys but the overall clarity isn't as impressive. If I could do it over i would likely buy a q-logic enclosure instead.

0 of 0 found this helpful

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Blanche

Satellite Beach, FL

Overall
Durability
Value
Features
Design
Usability
Great Buy!!!!!!

October 19, 2006

This Box is great for the price and it has the looks to kill. It looks great and it hits hard with it front ported design. The only thing that I really didnt like about it was it only holds regular size subs not double stack magnets, other than that, its a great buy!

0 of 0 found this helpful

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Christoper

Ellicott City, MD

Overall
Durability
Value
Features
Design
Usability
Cool looking box

July 19, 2006

I had installed this product into a friends car and the box looks great. Also, the ports work well. Remember a ported box is better for louder bass for music like hip hop. The installation of the subwoofers were a bit of a pain but other than that the box looks awesome.

1 of 2 found this helpful

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Accessory Tools and Products

Accessories added

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8 Gauge - Stinger Amp Kit

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Atrend 12G

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Atrend 12GB

Black Bar Style Grille for 12" Subwoofers (1Pair)

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High-Performance Streetwires Speaker Wire

25 ft. of 12 Gauge speaker cable with twisted pair construction for improved power flow and fine-stranded copper windings.

Your Price $37.85

NVX SDRLR1 Universal Roller Tool

Install your sound damping with the SDRLR1 tool

Your Price $7.99

20 ft. of Dynamat Xtreme Trunk Kit

Keep your trunk from rattling and improve bass quality by using a sound dampening trunk kit.

Your Price $87.63

NVX SDBP40 - 40 ft. (10% More Than Competition)

40 ft. Bulk Pack of Sound Dampening Material

Your Price $97.99

36 ft. of Dynamat Extreme Bulk Pack

Make your sound system sound perfect by reducing road noise with 9 sheets of sound dampening material.

Your Price $159.99

Banana Clip Terminals

These high grade banana clips allow you to plug into your banana clip ready terminal for a secure connection.

Your Price $1.99

12 oz. Can of Adhesive Spray

Spray adhesive used for adhering carpet to subwoofer boxes without bubbles or can be used for your polyfil.

Your Price $8.97

Car Stereo and Speaker / Subwoofer Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $18.99

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Product Summary

Manufacturer

Model Number

12MJDB

Weight

50.00lbs

Internal SKU

12mjdb

Internal Product ID

5105

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Molded JMC Box (12MJDB)