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Different Types of Bandpass Subwoofer Boxes

There are a lot of types when it comes to Bandpass subwoofers, each serving the audiohead's specific needs. Don’t just blindly follow and randomly select any. Your needs and subwoofer manual will dictate the types of bandpass subwoofer you should have.

The end goal is to produce the best sound with the instruments you have. This means your subs must be in perfect tune with the bandpass enclosure. Now, we will be looking into the most common bandpass subwoofer, and in each type, we will see more intricate sub-types.

A bandpass subwoofer box is a type of speaker enclosure that is designed to deliver a highly efficient and focused bass response within a specific range of frequencies. They are often used in situations where space is limited or specific bass frequencies are desired.

The term "bandpass" refers to the way the enclosure allows only a certain band of frequencies to pass through while attenuating frequencies outside of this band.

To get a complete idea, let’s remind,

  • A sealed box is the simplest type of subwoofer enclosure. It consists of a completely sealed compartment with the subwoofer mounted inside. This airtight design prevents air from escaping or entering the box.
  • Ported boxes or Bass-Reflex enclosures have a vent or port beside the subwoofer's main chamber. This port is tuned to a specific frequency and allows air to move in and out of the box, enhancing the subwoofer's efficiency at and around the port's tuned frequency.
Ported and sealed box subwoofer enclosure

The Bandpass subwoofer box is unique because it combines the properties of both sealed and ported boxes to control the speaker's response across different frequencies.

A bandpass box typically consists of two chambers. The first chamber is sealed, housing the back side of the subwoofer, and the second chamber is ported, allowing sound to pass out of the enclosure through a tuned port.

The variations in the construction of sealed and ported chambers give birth to countless types of Bandpass Subwoofer Boxes. Let’s see them.

What Are the Types of Bandpass Subwoofers?

There might be many, but here we have accumulated the most common ones. Have a look at what they have to offer.

1. 4th Order Bandpass Subwoofer

Think of the 4th-order bandpass box as the starting point. It is designed to offer a compromise between the tight control of sealed boxes and the efficiency of ported ones.

They are quite compact compared to other designs and are known for their ability to deliver strong bass output over a relatively narrow frequency range. If you're looking for that middle ground, this might be your Goldilocks zone.

The "fourth order" term refers to the slope of the filter created by the enclosure, which is typically 24 dB per octave. This design allows for efficient use of the subwoofer, providing louder bass at the tuning frequency compared to sealed designs.

Now, let’s see the variations of the 4th order bandpass. 

1A. Single Reflex - Band Pass

It has a sealed section in the back and a ported (or vented) section in the front. The sealed part helps control the bass's lower end, ensuring it doesn't get too boomy.

This design is a "bandpass" because it allows only a specific range of frequencies to pass through, effectively acting as a filter to accentuate certain bass frequencies.

Single Reflex Bandpass Enclosure

1B. Isobaric Single Reflex Bandpass

It takes the compact benefits of isobaric designs and combines them with the targeted bass response of a bandpass enclosure. It's efficient and sharp.

Isobaric Single Reflex Bandpass

1C. Three Chamber Single Reflex Bandpass

It typically involves one sealed chamber and two ported chambers. This design allows for more control over the sound characteristics, offering enhanced customization of the bass response, potentially improving both the quality and quantity of the bass produced.

Three Chamber Single Reflex Bandpass

1D. Isobaric Three Chamber Single Reflex Bandpass

This enclosure combines the concepts of isobaric speaker placement and a three-chamber single-reflex bandpass design.

The isobaric configuration allows for a reduction in the overall size of the enclosure, while the three chambers provide precise control over the enclosure's acoustic properties.

Isobaric Three Chamber Single Reflex Bandpass

2. 6th Order Bandpass Subwoofer

Now, if you're aiming for precision, the 6th-order box is like the sharpshooter of subwoofer boxes. With ported chambers on both sides, it narrows down the bass to a specific range, giving you tight control over the frequencies.

The 6th-order bandpass stands out because it's super picky about the sounds it lets through, blocking out anything that doesn't fit its narrow range. This precision is key not just for awesome sound systems but also for gadgets that use wireless signals, where getting the frequencies just right is super important. Thanks to this pickiness, you get super clean and spot-on sound, especially when you pair it with top-notch Bluetooth car stereo.

There are commonly 6 major types of the 6th order Bandpass. Have a look at them. 

2A. Quasi Sixth Order Series-Tuned Bandpass

This design involves two chambers with different tuning frequencies connected in series. This setup allows your subwoofer to produce a wide range of bass frequencies more efficiently.

It's like having two specialized tools in one kit, each tuned to handle different tasks for a broader, more versatile performance.

Quasi 6th Order Series Tuned Bandpass

2B. Isobaric Quasi Sixth Order Series-Tuned Bandpass

In this variation, you still have the quasi-sixth-order design, but it's implemented in an isobaric configuration. This means you're using two subwoofers facing each other or side by side in a compact space.

This setup reduces the required box volume while maintaining the wide-range efficiency of the sixth-order design. It's a way to save space without compromising on the breadth of bass frequencies you can enjoy.

Isobaric Quasi Sixth Order Series-Tuned Bandpass

2C. Dual Reflex Bandpass

This enclosure design features two ported chambers, allowing the subwoofer to produce a more pronounced bass over a specific frequency range.

The dual reflex design enhances the efficiency of the bass output, making it ideal if you're looking for that extra oomph in your music or movies.

Dual Reflex Bandpass

2D. Isobaric Dual Reflex Bandpass

Here, the dual reflex bandpass design is combined with an isobaric speaker setup. This means you get the benefits of a potent, focused bass response in a more compact enclosure. It's perfect if you need powerful bass but are working with limited space.

Isobaric Dual Reflex Bandpass

2E. Three Chamber Dual Reflex Bandpass

Taking it a step further, this design incorporates three chambers, offering even more control over the bass response. With two ports and an extra chamber, you can fine-tune the sound to get both the power and precision you desire.

Three Chamber Dual Reflex Bandpass Enclosure

2F. Isobaric Three Chamber Dual Reflex Bandpass

This is the most complex and refined option, combining the three-chamber dual reflex design with an isobaric configuration. You get the ultimate control over your bass, allowing for a powerful, nuanced output from a relatively compact box.

Isobaric Three Chamber Dual Reflex Bandpass

3. 8th Order Bandpass Subwoofer

The 8th-order bandpass enclosures are for those who want to blow the roof off, focusing on drivers who compete to see just how loud their systems can go. With these designs, reaching sound pressure levels (SPL) way over 150 dB isn't just a dream—it's a reality. 

However, achieving these ear-splitting volumes isn't just about the box; it also depends on your choice of subwoofer, the power of your amp, and how well you tune the whole setup. 

And guess what? The journey doesn't end with 8th-order designs. There's a whole world of advanced bandpass subwoofer enclosures out there, each crafted for unique sound goals. So, if you thought we'd hit the ceiling, think again. 

3A. Quasi 8th Order Series-Tuned Dual Reflex Bandpass

It skillfully combines two ported chambers with an additional series-tuned section, achieving an extensive frequency range with remarkable efficiency. This innovative design marries the precision of dual reflex systems with the broad capabilities of series tuning, delivering diverse and rich bass tones.

Quasi 8th Order Series-Tuned Dual Reflex Bandpass

3B. Isobaric Quasi 8th Order Series-Tuned Dual Reflex Bandpass

This is especially made for those with space constraints who are unwilling to compromise on sound. Placing two subwoofers in a compact, face-to-face, or side-by-side arrangement within this sophisticated design drastically reduces required space while maintaining a broad and efficient frequency response.

Isobaric Quasi 8th Order Series Tuned Dual Reflex Bandpass Enclosure

3C. 8th Order Triple Reflex Bandpass

It escalates complexity and performance, featuring three ported chambers; each fine-tuned to distinct frequencies. This setup excels in delivering a wide-ranging bass spectrum with precision, catering to those aiming for deep, impactful bass within finely tuned audio systems.

8th Order Triple Reflex Bandpass

3D. Isobaric 8th Order Triple Reflex Bandpass

It merges the isobaric concept with the triple chamber design. This approach minimizes enclosure size without sacrificing the detailed and wide-reaching bass response, epitomizing efficiency and advanced design for audiophiles who seek exceptional bass quality in limited spaces.

Isobaric 8th Order Triple Reflex Bandpass

Wrapping up

Usually, you buy a sub first and later decide on the bandpass enclosure. So, while selecting the enclosure type, you should focus on complementing your sub's specification. A good way to achieve that is by reading the user manual and seeing what types of bandpass subwoofer the company is suggesting.

Hope that is more than what you need. If you have further queries, comment below. We will reply to you in no time.

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