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In Phase Car Audio InPhase IPA8701D 1 Ohm Stable 1600 Watts MonobloIPA8701D
£139.99 Save £160.00  was:£299.99
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5 Stars (7)

In Phase Car Audio InPhase IPA8701D 1 Ohm Stable 1600 Watts Monoblock with Subsonic Filter

£139.99 Save £160.00 (53%)  was:£299.99
5 Stars
7 Review(s) / write a review
Quickfind Code - 42213
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

  • 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 Christmas returns extended until 7th January 2022

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Key Features

InPhase 1 Ohm Stable 1600 Watts Monoblock with Subsonic Filter - In Phase Car Audio IPA8701D

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 30 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 IPA8701D/IPA8704D 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 amplfiiers ensure this amp camoflages 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 IPA8701D Click here for Image of In Phase Car Audio IPA8701D
Technical Specification
  • 300W RMS x1 @ 4 ohms
  • 500W RMS x1 @ 2 ohms
  • 800W RMS x1 @ 1 ohms
  • 1600 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
  • 1 ohms Stable
  • Variable Subsonic Filter 20Hz- 50Hz
  • Low pass filter frequency 50Hz - 250Hz
  • Digital Subwoofer Level Control
  • Bass Boost
Related Accessories
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Customer reviews

Impressive amp, clear instructions
Pavilion on 26/10/2021 5 star rating

Got this amp to power my Vibe 12" Slick High Output Sub Box. The power output is INSANE! The tunability is equally as impressive. The logo has a cool blue LED that lights up when its on, and it's not too big. The instructions were very easy to follow and setup was very quick

Small and powerful
Papa J on 31/08/2021 5 star rating

Great amp, it is not too big and easy to install, best thing it has lots of power. I am running two Pioneer subs and this baby is rocking them tonk! Love it, great amp.

Running two Pioneer TS-W subs
Jack on 21/11/2020 5 star rating

Running two Pioneer TS-W 500W RMS subs off this amp. sounds much better than my pioneer amp I had before

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Questions/Answers About This Product
  • Question: 12 October 2021
    Car: Rover 75 - 1999-2005

    Hello guys am looking to run this amp on t-rex 10 3000 watt I have small trunk no space so looking for small amp with punch 👊


    You are better off going for the IPA9701D.

    InPhase IPA9701D 1 Ohm Stable 2400 Watts Monoblock with Subsonic Filter
    JWTRU21 2 Gauge High Power Amplifier Wiring Kit 3800W

    Found Useful? Yes 

  • Question: 12 September 2021
    Interested in running a pioneer tsa300d4 sub off this amp. the RMS will match perfectly at 2ohm, however I’ve read other people are running 2 500w rms subs off this amp at 2ohm? Can it be done?

    Hi there,

    2 500W rms subs cant be run through this amplifier.
    Also, 2 of the pioneer tsa300d4 speakers will need exactly 800W rms at 1 ohm, only if connected in parallel.

    It is recommended to use an amplifier with a higher output than needed for better sound quality and experience. Please see below.

    InPhase IPA9701D 1 Ohm Stable 2400 Watts Monoblock with Subsonic Filter

    Found Useful? Yes 

  • Question: 10 August 2021
    Car: VW Transporter - <2004

    can i run 2x Focal SUBP25DB 10inch at the 500w 2ohms output of this amp.
    4ohm & 4ohm at parallel equalling 2ohm


    If you are connecting 2 dual voice coil speakers at 4 ohms parallel, it will be cutting it close.
    The below amp should give you much better output:-

    InPhase IPA9701D 1 Ohm Stable 2400 Watts Monoblock with Subsonic Filter

    Found Useful? Yes 

  • View All
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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