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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 (6)
4 Channel Amplifiers In Phase IPX1404

In Phase IPX1404 4 channel 2400 watts amplifier

Save: £200.47 (61%)  rrp: £329.99
5 Stars
6 Review(s) / write a review
Quickfind Code - 23992
Save: £200.47 (61%)
rrp: £329.99
This product has been discontinued

  • 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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Sorry, this product has been discountinued. We recommend the following product.

In Phase IPA1041 1000 Watts 4 Channel Amplifier
In Phase IPA1041

Key Features

4 channel 2400 watts amplifier - In Phase IPX1404

InPhase Audio Won FAST Car Award


InPhase IPX1404

InPhase amplifiers are made to rock your world. With great muscle also comes refinement. Advanced features such as bass boost, fully variable zero to 60Hz subsonic filters and crossover networks with different frequency bands for highpass and lowpass, you will always have full control. Connectivity is excellent with high level as well as RCA inputs and a pass through RCA output to feed more amps, without needing multiple runs of RCA cables. With two ohm stable designs, trimode capability and clever protection circuits, these hand-built powerhouses will take anything you throw at them. Massive heat sinks with a high surface area to volume ratios and cast end caps to hide the wiring connections and keep things controlled – helped by forced air cooling on the real bass monsters. All the amps may be bridged for even more power into one channel. Four and two channel designs, all with potent MOSFET power supplies, cover every need from single-amp whole system solutions, all the way to pavement-shaking power mania. There is always a high quality InPhase amplifier (or two) that’s just perfect for your hunger for power.
The New InPhase IPX range of amplifiers from InPhase are possibly one of the best car amplifiers available today. Car amplifiers are the heart of a system and need be of the best quality available for your budget. Inphase IPX range of car amplifiers have been renowned throughout the world and are rated very high by some of the most famous musicians like Akon.  All Inphase IPX car amplifiers are hand assembled and go through 35 different check points to ensure you get the best possible car amplifier today. The IPX range of car amplifiers give you the true RMS power to power your system. Some of the amazing features of the new Inphase IPX range of amplifiers have a Subsonic filter so you can adjust your amplifier to deliver more power to the desire frequency range, which mean more power to your speaker. Line in and line out so you can run as many InPhase amplifiers as you want one a single RCA cable. Dual layer circuit boards for improved sound quality and low resistance from internal parts give you a smaller and yet more powerful amplifier.


Download image of In Phase IPX1404 Click here for Image of In Phase IPX1404
Technical Specification

Key Features:

  • 4 Channel 2400 watts amplifier
  • Four Class 'AB' High Current Dual Discrete Drive Stages
  • Class 'AB' Technology MOSFET PWM Power Supply
  • Bridgeable & Tri-Mode Operation
  • Continously Variable 12dB / Octave High Pass & 12dB Octave Low Pass Crossover
  • Subwoofer Variable Crossover for Deep Bass Crossover
  • Enhanced Bass Boost +12dB @ 50Hz
  • Silver plated RCA Power & Speaker Terminals
  • Soft Start & Muting
  • Thermal, short and DC Circuit Protection
  • Power & Protection Indicator
  • Low pass filter: 50Hz - 250Hz (variable)
  • High pass filter: 80Hz - 1.2kHz (variable)
  • Subsonic filter: 20Hz - 50Hz (variable)
  • Dimensions: 255mm x 58mm x 444mm
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Customer reviews

In phase upxxx 1404
Paul pittaway on 10/06/2016 5 star rating

Don't normally bother with reviews but this is a superb amp, put one in my boxster with a couple of kenwood under seat subs, with the Porsche Bose rear speaker and hyphonics door speakers, now I'm deaf, so clear with shattering bass, now just put one in my X type jag, just need to upgrade the door speakers, still sounds amazing, so versatile in setup, lots of adjustment

Awesome amp
Tom on 17/04/2016 5 star rating

Bought this amp to run a 12" 1000w Alpine sub and Inphase front component system. I have the gain turned down low on the amp and it still delivers insane volume and clarity. Unbelievable sound for the price.

manager manchester store
phil on 28/10/2015 5 star rating

hi i'm phil the manager at manchester store noticed theirs only afew reviews on this amp so thought i'd put my opinion on here i do sell loads of these amps so i'm surprised theirs not more reviews i mainly use this amp for running subs and 6x9 shelves on one amp can be used for just speakers but its just what i've used it for. last car i did was a golf customer built his own shelf with 2 sets of 6x9's and he had a 12" pioneer sub, The amp runs it all perfectly the shelf was pretty loud, still surprses me as this amp is very cheap to buy, the sub sounded great, lovely deep bass tone and the customer loved it, so much that he bought the ipx1004 to run his front and back doors too that was a car you could hear coming haha all in all a great amp for the money plenty of power and good quality

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Questions/Answers About This Product
  • Question: 03 September 2017
    Car: Audi A8 - 2004>

    I was hoping to find out the RMS power output if this,and, will it run 2 channel + 1 channel bridged?
    many thanks


    yes it will run 2 channel and the other two channels bridged based on that subwoofer you are running on the bridge channel is 4 ohm, their isnt any tested RMS ratings from what i can see, i would estimate the amplifier to be around 600w rms split over 4 channels

    Found Useful? Yes 

  • Question: 28 June 2017
    Car: Renault Clio - 2000 >

    I have a 1300w sub and 500w 6*9 with 259w side speakers would this be ok

    Thanks for your question.

    Ideally, you would need another amp for your sub, other than the sub the IPX404 should be good.

    Please see below for a suggested amp for your sub-woofer.

    GM-D8601 1600W Class-D MONO Amplifier with Bass boost remote
    KAC-9106D Monoblock 2000W Power Amplifier

    Found Useful? Yes 

  • Question: 09 June 2017
    Car: Renault Clio - 2000 >

    Hi, do you know the rated RMS power output of each channel at 4 ohms?


    It is 100rms per channel.

    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