How To Build a Dual 12 Inch Subwoofer Box [Step by Step]

Have you ever thought of how to build a dual 12 inch subwoofer box for your lovely car? Obviously the dual 12-inch one. But, don’t know the design process? No worries! We’ll show you the process step by step with the related facts and instructions.

A subwoofer box is a loudspeaker enclosure and is often known as a ‘loudspeaker cabinet’. It comprises speaker drivers and various electronic hardware, including crossover circuits and amplifiers sometimes. They produce relatively low-pitched frequencies than the other simple speaker sound systems.

Another purpose of these subwoofers is to produce and increase the bass sound and prevent sound cancellation. So, without further delay, let’s get started. All you need is to have some tools and hardware materials. Besides, we’ll work through a design, build, and process along with lots of tips and tricks.

Why Should You Build Your Subwoofer Box?

Before designing and building a subwoofer box, you might ask yourself why you should make your own? There are several reasons and conveniences included with the custom design. We’ll walk through them too.

You know the ordinary loudspeakers are unable to produce a low-frequency when playing music. No matter how much money you spend on the specifications. Another issue is the interference in the speakers at a high-frequency range that involves low-frequency sounds.

Build Your Subwoofer Box

Thereby, a  subwoofer box is here to solve this problem, which incredibly eliminates the interference and increases the music’s bass. Further, you can use these subwoofer boxes in your newly owned cars and spacious vehicle to boost audio sound quality.

In addition, you can minimize the cost of so-called expensive sound systems and materials. It’s possible to make a custom sound system with cheap and costly materials. Besides, another reason for making your own is to get the freedom to show creativity and design in the music system.

The subwoofers also produce deep bass audio in your car, especially the 12-inch one. You can fit them into your car compartment to enjoy a high-quality music experience.

The Components You Need To Build A Subwoofer Box

You can make a subwoofer with some simple tools and the other basic building materials and audio drivers. As you know, the driver is very crucial to produce and deliver a signature sound effect. You should also consider the box and size of the woofer you’re building.

The shape and size are very essentials to determine the sound quality they produce. Here, we’ve listed the pieces of equipment you need:

  1. Speaker terminals. They help you to make a sound.
  2. An electronic amplifier. It’ll power up the subwoofer box.
  3. Some foam and fiberglass. They improve the quality of acoustics and insulation.
  4. I need to make a port, especially for ported one.
  5. Different design materials for the box. The paints and varnishes are good ones.

Besides these pieces of equipment, you also need to have some of the working tools. Here they’re:

  1. An electric drill machine. Electric one will be perfect.
  2. A jigsaw cutting machine.
  3. A circular saw.
  4. Carpenter or wood glue.
  5. Some 2-inch screws.
  6. Terminal cup.
  7. Silicone caulk sealer.

What Is The Budget To Build A Subwoofer Box?

It’s essential to determine a budget when building your own as a DIY project. Spending huge money and effort would be a bad idea in some cases. Otherwise, you might afford a budget car audio subwoofer box from the market instead of making it yourself.

Simply put, the budget may vary depending on project quality and capability, so pay attention to the money you’re completing the project. However, the materials you need to build a subwoofer box are cheap and affordable price. It would cost you between 30 to 40 USD.

Hmm, you have to spend a bit on the enclosures. Alternatively, you also get from the market instead of making ones. It would cost less.

How Much Time It Will Takes?

The time estimation of making a subwoofer box mostly depends on your skill and experience. To minimize this time, you should also have proper knowledge about the pieces of equipment you’re using.

The process will take about 1.30-2 hours to complete basic architecture and fit all the components with the right woodworking tools. Aren’t you an expert? Don’t worry! In this case, it may take a maximum of 4-6 hours with the required types of equipment.

But, what are the types?

What Are The Types Of Subwoofer Box?

There are several types of subwoofer boxes you can ever make. The sealed and ported subwoofer are the most popular among them. The bandpass box is also a popular design but we’ll cover it later.

The name describes everything. A sealed subwoofer box comes with a completely sealed box design that doesn’t have an air outlet. The sealed one needs a lower space with an adequate speaker size.

On the contrary, the ported ones have a port to pass air and damping effect. Thereby, it requires relatively low power with no damping effect.

Types Impact
Sealed Box
  1. Tighter and provide more bass accuracy
  2. Occupies less space with smaller size
  3. It needs more amount of power for loud volumes bass
Ported Box
  1. Louder and boomy bass but deliver less sound accuracy
  2. Comparatively, a bit larger box
  3. It requires much power with more bass efficiency

Therefore, both have some pros and cons so it’s up to you which one you should go for.

How To Determine The Dimensions Of A Box?

You should’ve some measurements while determining the dimensions for the subwoofer box. Here’s the list:

  1. Minimum depth.
  2. Minimum height and width.
  3. Volume and proportion of the internal dimensions.

Size for a Ported Subwoofer Box?

Collect and consider some related data to determine ported box dimensions. We’ve provided a list for your convenience. Please make a change if according to yours.

  1. Number of drivers
  2. Size of that drivers
  3. Container’s volume
  4. Tuning frequencies
  5. The Xmax

Dual 12 Inch Subwoofer Box Design

A 12 inch subwoofer box would be suitable if you have a luxury car with a bit larger compartment space. You can also use it as a home theater sound system. But remember, it produces a booming sound, so make sure people are enjoying every beat.

Dual 12 Inch Subwoofer Box

Dimensions For A Dual 12 Inch Subwoofer Box

We provided a sample dimension and measurement for a 12 inch ported subwoofer speaker box. Here, you make your custom design in 3D sizes.

  1. Height: 14-1/4 inch
  2. Width: 48-3/4 inch
  3. Depth: 5-1/2 and 7-3/4 inch
  4. Mounting position: 5-1/4 inch
  5. Interior volume: 2.25 cu. Ft.

We provided a demo and rough calculation. Please get and watch an accurate dimension with a 3D live demo. You should also keep some words in your mind when designing it yourself:

  1. Type of enclosure
  2. Enclosure design
  3. Subwoofer enclosure


If you made it properly, a subwoofer box could impact your sound system in your car, home, and events. We hope our instructions will help you in telling how to build a dual 12 inch subwoofer box. All you need have the proper knowledge about the materials, components, and measurements of the box you’re going to build. So what are you waiting for? Try and make your own soon.

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