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In Phase USW8 - 300W Diecast Aluminium Compact Underseat SubwooferUSW8
£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 (4)

In Phase USW8 - 300W Diecast Aluminium Compact Underseat Subwoofer

Save: £110.00 (55%)  rrp: £199.99
5 Stars
4 Review(s) / write a review
Quickfind Code - 32912
Quick Summary:

Compact, powerful, discreet and built to last.

Save: £110.00 (55%)
rrp: £199.99
In Stock!
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On Orders Over £500

  • Free Car Air Freshener with every order Free Car Air Freshener with every order
  • Next Day Delivery available on all order before 5pm Next Day Delivery available on all order before 5pm
  • Easy Returns Easy Returns
  • 1 Year Easy Warranty 1 Year Easy Warranty

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Key Features

300W Diecast Aluminium Compact Underseat Subwoofer - In Phase USW8

Compact, powerful, discreet and built to last. The USW8 is the new addition to the In Phase USW series range. As with all the other USW series models this USW8 can really stand proud in a tough market with impressive specs and unrivalled build quality. Constructed from Die-cast through out it can be placed under the seat and you can rest assured it wont come to any harm, allowing you to sit back and enjoy the superior sound that you would expect from the In Phase product. The included wired remote gives you full control at your finger tips allowing you to control Gain and Freq response and even phase adjust.

Download image of In Phase USW8 Click here for Image of In Phase USW8
Technical Specification
General Features:
  • Max power 300W
  • Rated power 100w
  • 6" Aluminium cone
  • Die Cast aluminium chassis
  • Ultra slim design
  • High level signal input
  • Wired remote control
  • Power indication
  • Protection indicator
  • Phase button (0-180)
  • RCA Input terminals
  • Remote level control (5m)
  • Dimensions 289mm(w) x 220mm(H) x 75mm(D)
  • Weight (inc accessories) 4.4KG
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Customer reviews

Highly recommend
Daniel on 07/12/2017 5 star rating

Comes with pretty much everything needed for fitting and was really easy to install, have it mounted up in my passenger foot well as comes with tabs to be screwed down, sound is great and is much more than expected, obviously as so close to you doesn't need to be turned all the way up meaning it doesn't rattle everything inside and out! Highly recommend

David on 10/11/2016 5 star rating

This little active subwoofer produce so much bass it's unbelievable. I had it installed in my smart car from the ilford store. They installed it for me while i waited. Installation was nice and tidy. Remote controller mounted so it can be accessible easily. Promised to leave them a 5 star review so here it is Guys.

Great little sub!!
simonrc1 on 10/07/2016 5 star rating

Bought this underseat sub for my 107. It fits perfectly under the passenger seat and was very easy to wire up, coming with a comprehensive wiring kit, which was great. I thought I would have to make up the wiring myself, so this kit saved me time and thought! The sub complements my In Phase door speakers and tweeters and my In Phase 1200 Amp. The sub gives a greater depth to my in car sound; I listen to everything from punk to classical via jazz, so they have a lot to cope with! Highly recommended.

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Questions/Answers About This Product
  • Question: 27 March 2018
    Car: Honda Civic - 2005 >

    I have a 3 door Civic type S 2006 model. How much to fit subwoofer to standard set up?


    for all installation prices you would have to contact your nearest store .

    thank you

    Found Useful? Yes 

  • Question: 09 March 2018
    Car: Ford Focus - 2004>


    I have a 18 plate Ford Focus ST3 which has the Sony system installed with the subwoofer in the spare wheel. Would I be able to connect this into either the rear speakers or rear subwoofer?


    You can connect this to the rear speakers.

    Found Useful? Yes 

  • Question: 26 February 2018
    Usw 8 or 10

    What is your question? please give us more information so we can give you an accurate answer

    Found Useful? Yes 

  • View All
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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