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In Phase Car Audio IPA9704D 2 Ohm Stable 1600 Watts Digital 4 ChannIPA9704D
£174.99 Save £125.00  was:£299.99
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5 Stars (4)

In Phase Car Audio IPA9704D 2 Ohm Stable 1600 Watts Digital 4 Channel Amplifier

£174.99 Save £125.00 (42%)  was:£299.99
5 Stars
4 Review(s) / write a review
Quickfind Code - 42218
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 £125.00 (42%)
rrp: £299.99

  • 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

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Key Features

2 Ohm Stable 1600 Watts Digital 4 Channel Amplifier - In Phase Car Audio IPA9704D

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  for the 4 channel IPA Amps. This design enhances the flexibility to connect multiple subwoofers to a system.

Variable Low Pass Filter

For extra flexibility, a variable LPF makes audio frequency more adjustable according to subwoofer characteristics and personal listening preferences. The LPF is adjustable from 50 Hz to 250 Hz.

Small Footprint

The IPA series amps are not massive slabs of metal/plastic. They are compactly designed ensuring easy fitting. 

True RMS Power

The In Phase IPA9701D/IPA9704D go through numerous check points to ensure you get the true performance you are paying for. 

Stealth Design

Along with the slim design, the blackout design of these amplifiers ensure this amp camouflages into your boot, the intimidating LED blue lights in a blackout area, will give your system that evil look.


Download image of In Phase Car Audio IPA9704D Click here for Image of In Phase Car Audio IPA9704D
Technical Specification
  • 130W RMS x4 @ 4 ohms
  • 200W RMS x4 @ 2 ohms
  • 400W RMS x2 (2 Channels Bridged) @ 4 ohms
  • 1600 Watts Max Power
  • Regulated power supply
  • MOSFET power supply
  • Oversize Power Tranformer
  • Bipolar Output devices
  • Dimensions (L x W x H) 310mm x 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
  • 130W RMS x4 @ 4 ohms (At 14.4V. 4 Ohm 20Hz to 20kHz. > 1% THD)
  • 200W RMS x4 @ 2 ohms (At 14.4V. 2 Ohm 20Hz to 20kHz. > 1% THD)
  • 400W RMS x2 @ 4 ohms (At 14.4V. 4 Ohm 20Hz to 20kHz. > 1% THD)
  • 1600 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

alpine speakers
mohammed on 24/11/2020 5 star rating

Couldnt get an R type amp cos of cost, so I bought this instead. ruthless

The Build and Features
The EXPERT on 06/10/2020 5 star rating

Just taking a look at this New InPhase IPA 9704D. 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.

Iqbal on 05/10/2020 5 star rating

this amp bangs

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Questions/Answers About This Product
  • Question: 21 February 2021
    Car: VW Golf - 2003 > MK5

    I am looking to power 4 X 330w speakers. Will this be sufficient? I am going to use an active sub woofer, any issues with that?


    This amp will run 90% of major branded door speakers.

    Found Useful? Yes 

  • Question: 25 November 2020
    Hi there 8 was wondering what amplifiers I would need to power 2 pioneer 300 w rms front speakers 2 pioneer rear 320 w RMS speakers, 2 pioneer 6×9 5 way 700w RMS speakers and 2 kenwood 10" subs


    This amp would be ideal. I would suggest getting 2 of these.

    Found Useful? Yes 

  • Question: 03 October 2020
    Car: Seat Ibiza - 2008>

    I'm curious - I currently have Focal PS-165FX in the front of the car and Focal ISC165 in the rear powered off a Pioneer GM-D8604 - would I notice a difference if I upgraded the amp to this?


    This amp is a lot more powerful so you will hear the difference.

    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