How To Make a Sealed Box Louder

One way to improve the sound of your speakers is to enclose them in a box. However, if the box is sealed, you might find that the sound is not as loud as you would like it to be. In this article, we’ll explore how to make a sealed box louder so that you can enjoy your music to the fullest.

One of the most effective ways to make a sealed box louder is to use a more powerful amplifier. The amplifier is responsible for increasing the power output of your speakers, which in turn will increase the volume of your sound. You can also adjust the gain settings on your amplifier to boost the signal being sent to your speakers, further increasing the volume.

Another way to make your sealed box louder is to use a ported box instead. A ported box is designed to allow more air to flow in and out, which can improve the overall loudness of your speakers. 

However, it’s important to note that using a ported box can also affect the sound quality of your speakers, so you should experiment with different types of boxes to find the right balance between volume and sound quality.

Additionally, you can try adjusting the positioning of your speakers within the box. Placing your speakers closer to the opening of the box can help to direct the sound towards you, making it louder and more immersive. You can also experiment with different types of materials to line the interior of your box, such as fiberglass or acoustic foam, which can help to absorb unwanted vibrations and improve the overall sound quality.

How to Make a Subwoofer Box Louder

How to Make a Subwoofer Box Louder

Making a subwoofer box louder can be achieved by taking several steps, including selecting the right materials, designing an appropriate box size and shape, and tuning the subwoofer box to the specific requirements of the subwoofer. 

Here are the steps you can follow:

1. Choose the right materials

The material you use to build your subwoofer box plays a crucial role in the sound quality and volume. Opt for high-quality MDF (medium-density fiberboard) or plywood with a thickness of at least 0.75 inches. Using thicker and denser materials can help reduce vibrations and resonance, resulting in a louder and clearer sound.

2. Determine the ideal box size and shape

The size and shape of the box can also affect the loudness of your subwoofer. For instance, a larger box with more volume tends to produce deeper and louder bass. However, make sure the box size is suitable for your vehicle and won’t take up too much space.

3. Calculate the right port size

A properly designed port helps to enhance the bass output of your subwoofer box. Ensure the port size is optimized to your subwoofer specifications, taking into account factors such as box size, shape, and subwoofer type.

4. Seal the subwoofer box

The leakage of air from the subwoofer box can reduce the volume and quality of the sound. Make sure that the box is tightly sealed to prevent any air leaks. Use silicone caulking or adhesive to seal all joints and corners of the box.

5. Tune the subwoofer box

Tuning the subwoofer box involves finding the optimal frequency range for your subwoofer. You can use a frequency generator or a test tone CD to find the ideal frequency response of your subwoofer box. Adjust the port size, box size, and tuning frequency to achieve the maximum volume.

6. Power up your subwoofer

Finally, ensure that your subwoofer is adequately powered to produce the loudest and clearest sound. Make sure you use a compatible amplifier that can deliver the required wattage to your subwoofer.

Generally, making a subwoofer box louder involves using the right materials, choosing the ideal box size and shape, designing a suitable port size, sealing the box, tuning the subwoofer, and powering up the system.

Can a Sealed Subwoofer Box Be Too Big?

A sealed subwoofer box can be too big, and it can negatively impact the performance of the subwoofer. The size of the sealed box is one of the critical factors that determine the performance of the subwoofer.

If the sealed box is too large, it can lead to several issues:

  1. Reduced efficiency: A larger box size can reduce the efficiency of the subwoofer. The subwoofer driver’s excursion will be greater, and it will require more power to move the cone, resulting in a less efficient system.
  2. Reduced frequency response: A larger sealed box can result in a reduced frequency response, meaning that the subwoofer may not produce the desired bass frequencies. A sealed subwoofer box’s frequency response is dependent on the box’s internal volume, and an overly large box can limit the frequency response.
  3. Lack of control: A larger box size can result in reduced control over the subwoofer’s movement. The subwoofer may start to exhibit unwanted resonances and distortions due to the lack of control over its movement.
  4. Increased distortion: A larger box can also result in increased distortion due to the subwoofer driver’s excessive excursion. The subwoofer driver may reach the limits of its excursion capabilities, resulting in distortion and reduced sound quality.

Therefore, it is essential to select the appropriate box size for your subwoofer to ensure optimum performance. 

The recommended box size is usually provided in the subwoofer’s user manual, and it is crucial to adhere to these recommendations to achieve the best results.

How to Tune a Sealed Subwoofer Box to 30hz

How to Tune a Sealed Subwoofer Box to 30hz

Tuning a sealed subwoofer box to 30Hz requires the right combination of box volume and speaker parameters. 

Here are the steps to achieve this:

  1. Determine the speaker parameters: You will need to know the Thiele-Small parameters of your subwoofer driver, including the Vas (equivalent compliance), Qts (total Q factor), and Fs (resonant frequency). These can usually be found in the speaker’s datasheet or by contacting the manufacturer.
  2. Calculate the optimal box volume: Using the speaker parameters, you can use an online box volume calculator or software such as WinISD to determine the optimal box volume for a sealed enclosure tuned to 30Hz.
  3. Build the box: Once you have determined the optimal box volume, you can build a sealed enclosure using the appropriate dimensions. The box should be airtight and made from high-quality materials to avoid any leaks or resonance.
  4. Install the subwoofer driver: Once the box is complete, install the subwoofer driver and wire it to the amplifier.
  5. Test and adjust: Use a sound level meter and test tones to verify that the box is indeed tuned to 30Hz. If necessary, you can adjust the box volume slightly or add stuffing to fine-tune the response.

By following these steps, you should be able to successfully tune your sealed subwoofer box to 30Hz for optimal bass performance.

What Happens If My Sub Box Is Too Small?

If your “sub box” refers to the enclosure for a subwoofer, then having a box that is too small can have a negative impact on the performance of your subwoofer.

Subwoofers are designed to work optimally within a certain volume of air space. If the enclosure is too small, it can lead to a reduction in overall volume output, distortion, and even damage to the subwoofer.

When a subwoofer moves, it creates air pressure inside the enclosure, which affects the way the subwoofer produces sound. If the enclosure is too small, the subwoofer will have to work harder to produce the same volume of sound, leading to distortion and potential damage over time.

On the other hand, if the enclosure is too large, it can lead to a decrease in overall output, as the subwoofer will not be able to move enough air to produce optimal sound.

Therefore, it’s important to ensure that the subwoofer enclosure is the right size for your particular subwoofer, as this will ensure the best possible performance and longevity for your audio system.

How to Polyfill a Subwoofer Box?

Polyfill, also known as stuffing, is a material commonly used in subwoofer enclosures to improve the sound quality and performance of the subwoofer. Here’s a step-by-step guide on how to polyfill a subwoofer box:


  • Polyfill
  • Screwdriver
  • Scissors

Step 1: Open the subwoofer box

Using a screwdriver, carefully remove the screws that hold the subwoofer box together. Make sure to keep the screws in a safe place so you can easily reassemble the box later.

Step 2: Cut the polyfill

Using scissors, cut the polyfill into small pieces. The size of the pieces doesn’t matter too much, but smaller pieces are generally easier to work with.

Step 3: Insert the polyfill

Take a small handful of polyfill and insert it into the subwoofer box through the port or speaker hole. Use your hand to gently push the polyfill into the corners and edges of the box. Repeat this process until the box is about 50-75% full of polyfill.

Step 4: Test the sound

Once you have filled the box with polyfill, test the sound of the subwoofer to see if the sound quality has improved. If not, add more polyfill until you achieve the desired sound quality.

Step 5: Reassemble the subwoofer box

Once you are satisfied with the amount of polyfill in the subwoofer box, reassemble the box by screwing the pieces back together.

Note: It’s important not to overstuff the subwoofer box with polyfill, as this can actually cause a decrease in sound quality. Aim for a 50-75% fill for best results.

Can a Sealed Box Be Louder Than Ported?

Can a Sealed Box Be Louder Than Ported

In general, a ported enclosure is capable of producing louder and deeper bass compared to a sealed enclosure of the same size. 

This is because a ported box uses a vent or a port to enhance the bass response by allowing air to escape from the enclosure, resulting in the more efficient movement of air and lower distortion.

However, the overall loudness of a speaker system depends on several factors, such as driver sensitivity, power handling, and amplifier output. 

In some cases, a sealed box may be louder than a ported box, especially if the driver is more sensitive and the amplifier is more powerful.

Additionally, the size and shape of the enclosure can also play a role in the overall loudness. A larger sealed box can produce more output at low frequencies, while a smaller ported box can produce more output at higher frequencies.

How Do I Make My Sub Box Hit Harder?

To make your sub box hit harder, there are a few things you can try:

  1. Adjust the gain: The gain control on your amplifier can increase the voltage sent to your subwoofer, making it louder. However, be careful not to push the gain too high, as it can damage your sub.
  2. Increase the enclosure size: A larger enclosure can increase the volume of air that the subwoofer moves, resulting in a harder hit. However, make sure to match the enclosure size to the sub’s specifications to avoid damaging it.
  3. Use a lower tuning frequency: If your sub-box is ported, changing the tuning frequency can affect the sub’s output. A lower tuning frequency can result in a deeper, harder-hitting bass.
  4. Upgrade your subwoofer: If you have a low-quality sub, upgrading to a higher-quality one can result in a harder-hitting bass.
  5. Add sound deadening material: Adding sound-deadening material to the trunk or doors can reduce vibrations and increase the perceived volume of the bass.

Remember to always be careful when adjusting settings and make sure not to damage your equipment.

Does Putting a Speaker in a Box Make It Louder?

Putting a speaker in a box can make it louder. This is because the box can act as an acoustic resonator that helps to amplify the sound produced by the speaker. When a speaker driver moves back and forth, it produces sound waves that radiate in all directions. 

However, when the speaker is placed in a box, the sound waves bounce around inside the box and create standing waves, which can enhance certain frequencies.

The size and shape of the box, as well as the type of material used, can all have an impact on the sound produced. A well-designed box can help to increase the overall volume of the sound, as well as improve the quality and clarity of the bass. 

This is because the box can help to control the movement of air around the speaker, which can reduce distortion and improve efficiency.

However, it’s important to note that simply putting a speaker in any old box won’t necessarily make it louder or sound better. The box needs to be properly designed and tuned to work with the specific speaker driver being used. 

Additionally, the power output of the amplifier driving the speaker also plays a role in determining the overall volume level.

Which Is Better Sealed or Ported?

Which Is Better Sealed or Ported

Whether a sealed or ported enclosure is better for a speaker depends on several factors, including the specific speaker driver, the desired sound quality, and the intended use of the system.

Sealed enclosures are generally more compact and provide a tighter, more accurate bass response. They work by trapping air inside the enclosure, which acts as a spring to control the movement of the speaker cone. Sealed enclosures are generally recommended for music that requires precise, controlled bass, such as jazz, classical, and acoustic recordings.

Ported enclosures, on the other hand, are designed to allow air to flow in and out of the enclosure through a tuned port. This can result in a louder, deeper bass response with a greater emphasis on the lower frequencies. Ported enclosures are often recommended for music that requires a more powerful, boomy bass response, such as electronic dance music and hip-hop.

However, ported enclosures are generally larger and more complex to design and build than sealed enclosures. Additionally, ported enclosures may be more susceptible to distortion at high volume levels, and may require more power to drive.

The choice between a sealed or ported enclosure depends on personal preference and the specific requirements of the speaker system. It’s important to choose a design that matches the speaker driver and amplifier being used and to carefully consider the intended use and desired sound quality.


In general, sealed enclosures are not designed for maximum loudness, but rather for accuracy and control. However, there are a few things to note on how to make a sealed box louder. These include:

  1. Increase the power: By increasing the power output of the amplifier driving the subwoofer, you can increase the overall volume level.
  2. Choose a more efficient subwoofer: Some subwoofers are more efficient than others, meaning they can produce more sound with the same amount of power. Choosing a more efficient subwoofer can help to increase the volume level of a sealed box.
  3. Increase the box size: While sealed boxes are typically designed to be compact, increasing the size of the box can help to increase the overall volume level.
  4. Add sound deadening material: Adding sound deadening material to the inside of the box can help to reduce vibrations and improve the perceived volume level of the subwoofer.

It’s important to note that making a sealed box louder may come at the cost of sound quality and accuracy. As such, it’s important to carefully consider the tradeoffs before attempting to increase the volume level of a sealed box.