Can You Put Two Subs in One Sealed Box?

two subs in one sealed box

If you’re a car audio enthusiast like me, you’re constantly seeking ways to enhance your sound system’s performance. One question that often arises is whether it’s possible to install two subs in one sealed box. As someone who has experimented with various setups, I can tell you that yes, it is indeed possible. However, there are both pros and cons to consider before diving into this setup. Let’s explore the ins and outs of using two subs in one sealed box.

My Experience

Before we delve into the specifics, let me share my personal experience with this setup. I’ve always been passionate about car audio, constantly tweaking and fine-tuning my system to achieve the best sound quality possible. When I first considered using two subs in one sealed box, I was intrigued by the potential for increased bass output and overall performance.

After careful research and consultation with fellow enthusiasts, I decided to give it a try. I selected two high-quality subwoofers and carefully constructed a sealed enclosure to house them both. The results were impressive, with noticeably deeper bass and improved clarity across the entire frequency range. However, it wasn’t without its challenges, which we’ll discuss shortly.

Pros and Cons

Increased bass outputLarger enclosure size
Improved overall sound qualityPotential for phase cancellation
Simplified wiringHigher power requirements
Enhanced aesthetics with one-box setupCostlier setup due to multiple subwoofers

While there are clear advantages to using two subs in one sealed box, such as increased bass output and improved sound quality, there are also some drawbacks to consider. The larger enclosure size required to accommodate multiple subs may pose a challenge in smaller vehicles with limited trunk space. Additionally, there’s a risk of phase cancellation if the subs aren’t properly aligned within the enclosure, which can negatively impact sound quality.

two subs in one sealed box

Furthermore, using two subs typically requires higher power requirements, meaning you may need to invest in a more powerful amplifier to drive them effectively. This can add to the overall cost of the setup. However, if you’re willing to invest the time and resources into properly designing and implementing the setup, the results can be well worth it.


Based on my experience, I would recommend exploring the option of using two subs in one sealed box if you’re looking to take your car audio system to the next level. However, it’s crucial to approach the setup with careful planning and attention to detail. Ensure that you select high-quality components and take the time to properly design and construct the enclosure to minimize any potential drawbacks. Few tips based on my experience:

  • Research and select subs with matching specifications to ensure compatibility and balanced performance.
  • Pay close attention to enclosure design and tuning to optimize bass response and minimize resonances.
  • Invest in a high-quality amplifier capable of delivering sufficient power to drive both subs effectively.
  • Experiment with different wiring configurations and amplifier settings to fine-tune the system to your preferences.


Q: Can I use different types of subs in the same sealed box?

A: While it’s technically possible, it’s generally not recommended. Using subs with different specifications and characteristics can lead to uneven bass response and potential sound quality issues.

Q: How do I ensure proper alignment of the subs within the enclosure?

A: Pay careful attention to the positioning of the subs within the box to minimize the risk of phase cancellation. Additionally, consider using a subwoofer alignment tool or seeking professional assistance to ensure optimal placement.

Q: What’s the best amplifier for powering two subs in one sealed box?

A: Look for an amplifier that can deliver sufficient power to drive both subs effectively while maintaining clarity and accuracy. Consider consulting with a car audio specialist to determine the best option for your specific setup.

Q: Will using two subs in one sealed box drain my car’s battery faster?

A: While it’s true that using multiple subs may draw more power from your car’s electrical system, the impact on your battery will largely depend on the size and efficiency of your amplifier. It’s a good idea to ensure that your car’s electrical system is capable of handling the increased power demand to prevent any issues.

Q: Can I use a pre-fabricated sealed box for housing two subs?

A: While pre-fabricated sealed boxes are convenient, they may not always be suitable for housing multiple subs. It’s important to check the specifications of the box to ensure that it can accommodate the size and configuration of your chosen subs. In some cases, customizing or building your own enclosure may be necessary to achieve optimal performance.


In conclusion, while the idea of using two subs in one sealed box may seem daunting, with careful planning and attention to detail, it can yield impressive results in terms of bass output and overall sound quality. Just be sure to weigh the pros and cons and proceed with caution to achieve the best possible outcome for your car audio system.

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