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In Phase Car Audio In Phase IPA8704D 2 Ohm Stable 1200 Watts DigitaIPA8704D
£119.99 Save £180.00  was:£299.99
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5 Stars (7)

In Phase Car Audio In Phase IPA8704D 2 Ohm Stable 1200 Watts Digital 4 Channel Amplifier

£119.99 Save £180.00 (60%)  was:£299.99
5 Stars
7 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 £180.00 (60%)
rrp: £299.99
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Key Features

In Phase 2 Ohm Stable 1200 Watts Digital 4 Channel Amplifier - 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 x3
  • Maximum input level/impedance 6V/22K ohm
Related Accessories
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Customer reviews

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

Part 1
The EXPERT on 06/10/2020 5 star rating

Just taking a look at this New InPhase IPA 8704D. The amplifier is very solid and has a lovely feel to it. I love the In Phase Badge in the middle on top of the amp. This also is illuminated when on (blue) or red for protection. The plastic has a very rubber touch so has a lovely high quality feel to it. Let's talk inputs. 2 or 4 channel input, you can use 2 channel input and flick the switch to 2 channel input mode, this will then give you 4 channel output. Both pairs of channels have full crossovers on, this is quite rare! So you can actually run all channels in Low pass mode 50Hz-250Hz (subwoofer) or High pass 50Hz-1.2KHz (speakers) or full range without any crossover. This offers full flexibility for system set up. All channels also have Bass Boost. Crossover is activated by the flick of the crossover switch. On the other end, very solid robust screw in connectors, so the bare wire just goes in. This allows for a more positive connection. At a push power cable size is 20mm or 4G. Speaker cable is 8mm or 10G. Overall this is a beautifully built amplifier with excellent features.

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Questions/Answers About This Product
  • Question: 09 June 2021
    Car: Seat Ibiza - 2008>

    I have a seat ibiza 6j 2011, what else would I need to buy for this amp? Also will it work with 4 car speakers and a sub?


    You will need the below fitting parts

    SRC6 6-Channel Active Hi to Low Frequency Converter
    JWTRU41 4 Gauge 2500w 4 Channel Amplifier Wiring Kit + RCAs

    Found Useful? Yes 

  • Question: 24 April 2021
    Car: BMW 3 Series (E46) - 2005> (E90)

    What harness do I need to buy to ensure plug n play? I have a 2014 BMW 3 series (F30) base stereo. Ideally a quadlock 30cm extension but I can't seem to find these online, what are they called?!


    You will need the below listed accessories.

    Speker Lead: 10-149

    CT10BM05 Parrot T-Harness

    Found Useful? Yes 

  • Question: 15 April 2021
    Car: Kia Ceed - 2010>

    Hi, I have a question. Is amplifier capable of powering 300w x2 subwoofer (RMS)and 250W (RMS) speaker?


    See the full specification below.

    100W RMS x4 @ 4 ohms
    150W RMS x4 @ 2 ohms
    300W RMS x2 (2 Channels Bridged) @ 4 ohms

    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