The Best Underseat Subwoofer 2021

An underseat subwoofer is the best way to improve the bass inside of your car without loosing any valuable space. Although they are much smaller than traditional subwoofers, they still add plenty of punch and depth to your music and below are some of the best.

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Best Underseat Subwoofer
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If you require a quick answer, the best underseat subwoofer is the Kenwood KSC-SW11, which delivers 150 watts of power and comes with a wired remote for adjusting the speaker settings. However, if you are willing to spend slightly more, the Pioneer TS-WX130DA offers additional performance and functionality.

After plenty of research and using a number of underseat subwoofers myself (the above photo is my Kenwood KSC model), we’ve gained plenty of experience with these speakers. As well as our experience, we also based the recommendations below upon multiple factors. The factors that we considered included their performance (peak power and RMS), size, construction, remote control, supplied hardware, warranty and value for money.

Underseat Subwoofer Comparison

Underseat SubwooferPeak PowerSize
Kenwood KSC-SW11150W28 x 19 x 7 cm
Pioneer TS-WX130DA160W28 x 20 x 7 cm
JBL Basspro SL250W34.4 x 25 x 7.1 cm
Pioneer TS-WX400DA250W30 x 20 x 10 cm
Alpine PWE-V80160W34.2 x 23.8 x 8 cm
IN PHASE AUDIO USW10300W27 x 27 x 6.9 cm

Compared to traditional car subwoofers that are much larger in size, the underseat alternative uses a compact design for versatile mounting. Whether you drive a small two seater or use your car for lugging tools around, the space savings make it a worthwhile investment for those requiring extra bass to their music.

Below is a list of the best underseat subwoofers that deliver powerful bass and fit easily underneath most car seats.

The Best Underseat Subwoofer


1. Kenwood KSC-SW11 Underseat Subwoofer

Kenwood KSC-SW11 Underseat Subwoofer
By far the most popular underseat subwoofer in the UK is the Kenwood KSC-SW11 and for good reason too. It’s constructed of an aluminium die cast frame and delivers a peak power rating of 150 watts.

Supplied with the underseat subwoofer is a wired remote control, which allows you to adjust the bass level, frequency and phase control without having to reach under the seat.

Other features of the Kenwood KSC-SW11 include:

  • 150 watts peak power
  • Built-in amplifier
  • Aluminium die cast frame
  • Supplied with a wired remote control
  • RCA and speaker level input
  • 28 x 19 x 7 cm in size

The Kenwood KSC-SW11 is an excellent all-round underseat subwoofer that ticks all the boxes and offers great value for money. Although it isn’t the most powerful, it provides more than enough power to compliment the existing speakers.
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2. Pioneer TS-WX130DA Underseat Subwoofer

Pioneer TS-WX130DA Underseat Subwoofer
Another popular underseat subwoofer is the Pioneer TS-WX130DA, which features a built-in class D amplifier. Depending upon your existing audio setup, this model is able to accept both speaker line or RCA line input. This means it has the benefit of being capable to connect to both OEM or aftermarket stereo systems.

Other features of the Pioneer TS-WX130DA include:

  • Peak power rated at 160 watts
  • RMS of 50 watts
  • Aluminium construction
  • Dynamic bass control with two modes
  • Easy to install to either OEM or aftermarket systems
  • Supplied with a wired remote control
  • 28 x 20 x 7 cm in size

The Pioneer TS-WX130DA is a highly rated underseat subwoofer that delivers powerful bass without any distortion. Although it comes with a premium price tag, it’s a worthwhile investment that’s backed by the reputable Pioneer brand.
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3. JBL Basspro SL2 Underseat Car Subwoofer

JBL Basspro SL2 Underseat Car Subwoofer
The JBL Basspro SL2 is a premium underseat car subwoofer that uses a shallow 8 inch woofer to provide deep bass. It also features a built-in amplifier, which the brand states uses minimal current and produces very little heat.

Other features of the JBL Basspro SL2 include:

  • Peak power rated at 250 watts
  • 125 watts RMS
  • Manual crossover control
  • 8 inch woofer
  • Robust ABS enclosure
  • Built-in amplifier
  • 34.4 x 25 x 7.1 cm in size

Although expensive, the JBL Basspro SL2 is a high performing underseat car subwoofer that won’t disappoint. It’s important to note that it doesn’t come with a remote control but JBL do offer a compatible optional extra remote.
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4. Pioneer TS-WX400DA Underseat Subwoofer

Pioneer TS-WX400DA Underseat Subwoofer
If you are looking for additional power, the Pioneer TS-WX400DA is the best option. It delivers an impressive 250 watts of power, which can be controlled via the supplied wired remote control.

Other features of the Pioneer TS-WX400DA include:

  • Peak power of 250 watts
  • Built-in class D amplifier
  • Digital bass control with two modes
  • Downfiring driver and acoustic reinforcement
  • Adjustable low-pass filter (50-125 Hz)
  • 100 dB speaker sensitivity
  • 30 x 20 x 10 cm in size

Overall, the Pioneer TS-WX400DA is the ultimate underseat subwoofer for those that want extra bass and willing to pay for it. Apart from the premium price, the only minor drawback is that it’s slightly larger than many of the alternatives.
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5. Alpine PWE-V80 Underseat Active Subwoofer

Alpine PWE-V80 Underseat Active Subwoofer
The Alpine PWE-V80 is another high quality underseat subwoofer that delivers 160 watts of peak power and 100 watts RMS. Unlike many of the alternatives, this model focuses upon build quality and it’s designed to withstand even the toughest of environments with a sealed die cast housing construction.

Other features of the Alpine PWE-V80 include:

  • Peaked power rated at 160 watts
  • 100 watts RMS
  • Built-in amplifier
  • Sealed die-cast housing
  • Speaker level and RCA inputs
  • Supplied with a wired remote control
  • 34.2 x 23.8 x 8 cm in size

As with the Pioneer alternative above, the Alpine PWE-V80 is on the larger size and it’s crucial that you take some measurements beforehand. However, apart from the size, it’s a high quality option that’s backed by the reputable Alpine brand for complete peace of mind.
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6. IN PHASE Audio Underseat Active Subwoofer

IN PHASE Audio Underseat Active Subwoofer
Another powerful underseat car subwoofer is by the IN PHASE Audio brand and it delivers a peak power output of 300 watts. Unlike many of the alternatives that have an angled rectangular design, this uses a compact circular construction that’s 27 x 27 x 6.9 cm in size.

Other features of the IN PHASE AUDIO USW10 include:

  • Peak power output of 300 watts
  • Slimline subwoofer enclosure
  • Supplied with the wiring kit and all accessories
  • RCA and high level inputs
  • Includes a bass remote control
  • Aluminium coned woofer

The USW10 underseat subwoofer by IN PHASE AUDIO combines value for money and impressive performance. It comes as a complete kit that’s ready to install from the box and delivers clean deep bass which won’t disappoint.
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How We Rated The Underseat Subwoofers

As mentioned above, we’ve owned a number of underseat subwoofers over the years and know what to look out for. As well as our experience, we also based our recommendations upon plenty of research and multiple factors. The factors that we considered included their performance (peak power and RMS), size, construction, remote control, supplied hardware, warranty and value for money.

Conclusion

Underseat subwoofers have become increasingly popular over the years because most modern cars lack the space for the traditional alternatives. To avoid disappointment, we strongly recommend that you measure the available room under the seat that you wish to mount the subwoofer. This is due to the fact that not all cars offer enough space for even the most compact of units. However, if this is the case, most can also be mounted elsewhere if required.

author dan 4car

Written By Dan

Dan has been a car enthusiast ever since he can remember and has an extensive range of cars that include classic cars that he has restored himself from a barn find condition to modern performance cars. Whether you need advice on how to install car parts or recommendations on what products to buy, Dan’s first-hand experience will certainly help.

If you want to find out more about Dan, our testing process or the website itself, visit our about page for further information.

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