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In Phase Car Audio IPA8704D 2 Ohm Stable 1200 Watts Digital 4 ChannIPA8704D
£139.99 Save £160.00  was:£299.99
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Everything you need to fit it yourself at home

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With Steering Wheel Control
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5 Stars (8)

In Phase Car Audio IPA8704D 2 Ohm Stable 1200 Watts Digital 4 Channel Amplifier **FREE AMPLIFIER WIRING KIT**

£139.99 Save £160.00 (53%)  was:£299.99
5 Stars
8 Review(s) / write a review
Quickfind Code - 42215
Quick Summary:

Audio serenity is not possible without state of the art technology. The New InPhase IPA range of amplifiers are possibly the best car amplifiers available today.

Condition: New

Save £160.00 (53%)
rrp: £299.99
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  • Free Car Air Freshener with every order Free Car Air Freshener with every order
  • Easy ReturnsEasy Returns
  • Next Day Delivery available on all orders before 5pm Next Day Delivery available on all orders before 5pm

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Key Features

2 Ohm Stable 1200 Watts Digital 4 Channel Amplifier **FREE AMPLIFIER WIRING KIT** - In Phase Car Audio IPA8704D

Car amplifiers are the heart of a system and need be of the best quality available for your budget. All Inphase IPA car amplifiers are hand assembled and go through 35 different check points to ensure you get the best possible car amplifier today. 

With One and 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. 

The newly designed IPA8701D, IPA8704D, IPA9701D and IPA9704D now incorporate digital technology into their design, these amps are direct competition to the Pioneer GM-D amplifiers.

The IPA series amplifiers are designed for performance in a performance build. So there is no speaker level input, these are designed to fit with an aftermarket headunit. But you do not need to panic, you can use a line out converter to fit this amplifier to your factory system. For fitting the IPA series amp to a factory system we advise using the In Phase SRCAPro or for higher performance, the In Phase SRC6.

British Design 

All In Phase amps are designed in the UK utilising over 30 years of audio experience to create a sound that is right for you. 

Improved Circuit Design

To prevent circuit shutdown, In Phase's new digital amplifier circuit, senses its internal temperature and automatically moderates input level accordingly. Stable, durable circuitry lessens the risk of high input power for the unit to achieve 1 Ω connection on the Monoblock IPA Amp and 2Ω 

Download image of In Phase Car Audio IPA8704D Click here for Image of In Phase Car Audio IPA8704D
Technical Specification
  • 100W RMS x4 @ 4 ohms
  • 150W RMS x4 @ 2 ohms
  • 300W RMS x2 (2 Channels Bridged) @ 4 ohms
  • 1200 Watts Max Power
  • Regulated power supply
  • MOSFET power supply
  • Oversize Power Tranformer
  • Bipolar Output devices
  • Dimensions (L x W x H) 280mmx 250mm x 55.5mm
  • Variable gain adjustment
  • Variable cross over (high/low pass)
  • Thermal protection
  • Overload protection
  • 2 ohms Stable
  • Low pass filter frequency 50Hz - 250Hz. Cut off -12dB/oct
  • High pass filter frequency 50Hz - 1.2kHz. Cut off -12dB/oct
Power Figures
  • 100W RMS x4 @ 4 ohms (At 14.4V. 4 Ohm 20Hz to 20kHz. > 1% THD)
  • 150W RMS x4 @ 2 ohms (At 14.4V. 2 Ohm 20Hz to 20kHz. > 1% THD)
  • 300W RMS x2 @ 4 ohms (At 14.4V. 4 Ohm 20Hz to 20kHz. > 1% THD)
  • 1200 Watts Max Power
  • Load Impedance- 2 ohm to 8 ohm
  • Average Current Consumption 1.3A (4 ohm for one Channel)
  • Average Current Consumption 1.5A (2 ohm for one Channel)
  • Average Current Consumption 2.5A (1 ohm for one Channel)
  • Fuse- 40A x2
  • Maximum input level/impedance 6V/22K ohm
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Customer reviews

Sound is high quality
Vik on 11/11/2021 5 star rating

I haved used In Phase amps for many years but never teh digital range. Not been a fan of class D digital car audio but with limited space in my car I decided to buy the In Phase Amp. I am very pleased with the sound, sound more like class AB then class D. Great sonics, bass reproduction is very tight and clear vocals to dream off!

Josh Gadden on 27/11/2020 5 star rating

The Power really blows me away with this Amp, I have a Kenwood amp that i have replaced and both are teh same power but the In Phase just sound So much louder! I dont know why? it also sounds so much clearer, the bass is very tight and drops low. WICKED Amp

Good Amp
Scott on 08/10/2020 5 star rating

Good Amp

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Questions/Answers About This Product
  • Question: 11 May 2022
    Car: BMW 5 Series (E39) - 2004> (E60)

    Would this power inphase 12"sub


    What else are you running off the amp?

    Found Useful? Yes 

  • Question: 13 July 2021
    Car: Vauxhall Insignia - 2009>

    On your website it says it has 30A x 3 but on the amplifier itself it has 30A x2?

    Sorry its a Typo its is 2 x 40amps on teh In Phase Amp

    Found Useful? Yes 

  • Question: 01 July 2021
    Car: Vauxhall Insignia - 2009>

    Would this amp power a pair of Focal 150w (max) and a Sub 75-300w amp power? JL Audio 10w1v3-4 Thanks


    This amp will work fine with those Focal speakers and subwoofer

    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:

120 - 122 Alfreton Road, Nottingham, Nottinghamshire, NG7 3NR
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