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In Phase Car Audio USW300 - 300W Underseat Compact SubwooferUSW300
£89.99 Save £110.00  was:£199.99
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Fit it Yourself?

Everything you need to fit it yourself at home

Only £30.00 

With Steering Wheel Control
Only £50.00 

5 Stars (45)

In Phase Car Audio USW300 - 300W Underseat Compact Subwoofer

£89.99 Save £110.00 (55%)  was:£199.99
5 Stars
45 Review(s) / write a review
Quickfind Code - 42186
Quick Summary:

Made from Diecast Aluminium fits snuggly under the seat of any car or in two seaters even behind the seats. Can be mounted inside the boot area also. Has complete control allowing for volume and phase adjustment by rotary hardwired.

Condition: New

Save £110.00 (55%)
rrp: £199.99
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Key Features

300W Underseat Compact Subwoofer - In Phase Car Audio USW300

The key thing about the In Phase USW 300 is the performance, the little active woofer really packs a punch, the bass response is amazing, you really do get SUB Bass from it. Its extremely responsive so the music has a completely different sound once added to the car. Many people think about changing speakers in you car, my advice is just add the USW 300 and you will think you have new life in your car! Enjoy its an awesome product.
This underseat subwoofer comes with it's own wiring and amplifier. Please do not use any other kit. 

Download image of In Phase Car Audio USW300 Click here for Image of In Phase Car Audio USW300
Technical Specification
  • 5" x 8" Aluminium Speaker
  • 130w RMS
  • 300w Max Power
  • Die Cast Aluminium construction
  • Variable Subwoofer crossover 40-150hz
  • Speaker Frequency range 40-150hz
  • Bass Boost 26db Gain @ 42Hz
  • Bass Boost Frequency
  • Wired Remote Control
  • High Level speaker input
  • Line input
  • Max Power consumption 10Amp
  • LED Power Indicator
  • Super Compact design
  • W 280mm x H 200mm x D 75mm
  • Weight 3.7KG
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Customer reviews

Best value sub for money
Milan on 13/09/2021 5 star rating

I really love how it produces bass.Definetly recommend others.

Awesome bit of kit for size
STEPHENHANCOCK on 20/08/2021 5 star rating

This unit really does kick out some good bass for its size. Fitted alongside sony head unit and matching sony mega bass speakers the sounds are amazing. Would recommend to just buy one.

Not bad
Big-will on 12/08/2021 5 star rating

Got this on sale and it's brilliant. I have a small c1 and I mounted it in the boot (I know it's an under seat sub but it's a small car)! There a nice deep boom from it with out disturbing the neighbours or rattling the back windows out. If you want your car to vibrate to death then your looking at the wrong product.

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Questions/Answers About This Product
  • Question: 18 August 2021
    Hi, we have a Mercedes c class 2016. Would this fit under the seat?

    Thank you


    Yes, this should fit under the seat.

    Found Useful? Yes 

  • Question: 09 August 2021
    Car: VW Transporter - 2005 >

    Hi, Do I need anything else for installing into a T6.1 Transporter?


    The USW300 comes with its own wirings as well as an inbuilt amp.

    Found Useful? Yes 

  • Question: 09 August 2021
    Looking for a simple set up for horse box to camper conversion. This plus 2/4 speakers? 6.5s?


    Go for the below set up

    XTC17.2CF 17cm 250 Watts 2-Way Rotary Tweeter Car Door/Shelf Speakers
    USW300 - 300W Underseat Compact Subwoofer
    XTC17.2 17cm 250 Watts 2-Way Rotary Tweeter Car Door/Shelf Speakers

    Found Useful? Yes 

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Fitting Services

Need help with Installation?

Here at CarAudioCentre we offer a professional and reputable fitting service in all our stores. For all fitting enquiries and bookings please visit or call one of our nationwide stores. Our fitters can install your new car stereo, DAB radio, audio visual, speakers, subwoofers or amplifier. We can also help to connect your iPod or MP3 player to you existing audio unit and can offer the best advice on the right in-car entertainment for your vehicle, to further this more we also offer a total 100% custom installation service for demo and show vehicles. So if you have an idea come on in and run it past us, the possibilities are endless and we are never too busy for an enthusiastic chat about our favourite subject.

Please note:

"That our two year warranty on products is only applicable to purchases made directly from us and that have been fitted in one of our stores."

Our Stores:

542 546 Mansfield Road, Sherwood NG5 2FR
Tel: 0115 9624 986
743-745 Eastern Ave, Newbury Park, London, IG2 7RT
Tel: 0208 599 2368
835 Garratt Lane, Tooting, London, SW17 0PG
Tel: 0208 971 9181