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In Phase IPA9704D 2 Ohm Stable 1600 Watts Digital 4 Channel AmplifiIPA9704D
£189.99 Save £110.00  was:£299.99
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5 Stars (8)

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

£189.99 Save £110.00 (37%)  was:£299.99
5 Stars
8 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 £110.00 (37%)
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 1600 Watts Digital 4 Channel Amplifier - In Phase 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 IPA9704D Click here for Image of In Phase 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

Very high quality, superb output
Pavilion on 26/10/2021 5 star rating

Got this amp to power 4x Alpine 100w RMS 17cm coaxial speakers, the power output on this amp is incredibly impressive. The build quality is fantastic and it doesn't take up huge amounts of space. Instructions were super easy to follow and the amp is quite versatile, allowing for many different configurations. Setup was also very simple, managed to get my system up and running in no time

very solid build
mr wesley n moore on 08/10/2021 5 star rating

Amp is built in the uk is made from metal looks and feels top quality whereas pioneer is made of plastic in China ive had 4 subs from the all broke in 3 months and had the tsz65cs of which I've had 2 sets both broke I chris at caraudiocentre was very helpful contacted pioneer got them credited and said I could have a different set of speaker so I went alpine knowing how terribly assembled pioneer equipment is I will never buy their stuff again so when I was looking for an amp I asked caraudiocentre for their recommendations and I bought and inphase amp and sub from them im installing it next week but given the quality of the amp I've recieved i have no doubt that it will be pure amazing

Really that good
Andy D on 31/08/2021 5 star rating

YES it is! This amp not only sounds good it looks amazing too, I wish I could post a phot of my install here too. The settings on the amp give excellent control allowing for a real precise setting for your needs. All I would say is if you are looking for a clean, musical and powerful amp...look at this amp, you will not regreat it.

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Questions/Answers About This Product
  • Question: 05 January 2022
    Car: Renault Megane - <2002

    Hello will this amplifier run 4x black air 6x9 speakers specified at 175 rms each 525 peak thanks


    Yes, this amp will run them fine.

    Found Useful? Yes 

  • Question: 08 December 2021
    Car: VW

    What component speakers do you suggest for this amp, that are around 100rms? Would I be able to wire 4 components and 2 6X9’s safely from this amp, if I wire 4 components across 2 channels? Thanks


    You can do that, but you could downgrade the audio quality and power output.

    It will be the same for any 4 channel amp. You should consider a 6 channel amp OR a 4 channel amp and a 2 channel amp

    Found Useful? Yes 

  • 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 

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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