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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 (3)
 In Phase Car Audio XTB312

In Phase Car Audio XTB312 Triple 12 inch 4200 Watts enclosure

Save: £350.00 (44%)  rrp: £799.99
5 Stars
3 Review(s) / write a review
Quickfind Code - 21491
Quick Summary:

Serious Bass for your car

Condition: New

Save: £350.00 (44%)
rrp: £799.99
This product has been discontinued

  • COVID-19 We are open online & shipping orders during the COVID-19 pandemic
  • Free Car Air Freshener with every order Free Car Air Freshener with every order
  • Next Day Delivery available on all orders before 5pm Next Day Delivery available on all orders before 5pm
  • Easy Returns Easy Returns
  • 1 Year Easy Warranty 1 Year Easy Warranty

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Sorry, this product has been discontinued. We recommend the following product.

DB Audio Systems TREX15 Active Double Subwoofer Mega Bass Performance Grade Package
DB Audio Systems TREX15 + IPA4001D + BS215S

Key Features

Triple 12 inch 4200 Watts enclosure - In Phase Car Audio XTB312

  • Triple 12' Subwoofer in 4th Order Enclosure
  • Driver: In Phase XT 12 x 3
  • Dual Voice Coil Subwoofer
  • Power: 4200W
  • Bass aero dynamic port: 3
  • Linear Aero Venting
  • Double Spider
  • Flush Fitted
  • Crakle Paint Effect
  • Frequency Response: 30-200Hz
  • Sensitivity: 95dB
  • Impedance: 2 ohms x 2
  • Height: 450mm
  • Width: 990mm
  • Depth: 327mm

Download image of In Phase Car Audio XTB312 Click here for Image of In Phase Car Audio XTB312
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Customer reviews

Bill on 05/09/2011 5 star rating

OMG the bass out of this box is killer, if you want crazy things to happen like your eye balls rattling and glass flexing and window mirrors dancing then this box is for you. Be warned get a good amp or 2 and a power cap will certainly tidy up the current needed to drive this

harvs on 29/03/2011 5 star rating

If there's a louder pre-built box i can't find it! Been a Car Audio Centre customer for years and always wanted one of these. Went in last week and caught Greg (manager) in a great mood-he's just had a baby-and managed to get a fat discount off this amazing box! The bass TEARS through you, the visceral impact is insane, this pulls the air out of your chest and makes your vision blur-your eyeballs are literally vibrating! Mental!

Grinter123 on 13/11/2006 5 star rating

bling bass so loud i actualy crackd my body kit, well worth the �....

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Questions/Answers About This Product
  • Question: 25 June 2017
    Car: BMW 3 Series (E46) - 1999-2005 (E46)

    Will it fit my e46 saloon back seat dont fold down thanks


    Thanks for your question, it is difficult to say without seeing the boot space as to whether this unit will fit.

    Found Useful? Yes 

  • Question: 13 August 2016
    Car: VW Golf - 1998 - 2003 MK4

    Will this fit my boot


    This will fit in your VW Golf.

    Found Useful? Yes 

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