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In Phase Car Audio IPA4001D 4000 Watts RMS Monoblock amplifierIPA4001D
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Fit it Yourself?

Everything you need to fit it yourself at home

Only £30.00 

With Steering Wheel Control
Only £50.00 

5 Stars (20)

In Phase Car Audio IPA4001D 4000 Watts RMS Monoblock amplifier

Save: £-50.00 (-13%)  rrp: £399.99
5 Stars
20 Review(s) / write a review
Quickfind Code - 23410
Quick Summary:

InPhase amplifiers are made to rock your world. With great muscle also comes refinement

Save: £-50.00 (-13%)
rrp: £399.99

Finance Available
On Orders Over £300

  • Free Car Air Freshener with every order Free Car Air Freshener with every order
  • Next Day Delivery available on all order before 5pm Next Day Delivery available on all order before 5pm
  • Easy Returns Easy Returns
  • 1 Year Easy Warranty 1 Year Easy Warranty

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Key Features

4000 Watts RMS Monoblock amplifier - In Phase Car Audio IPA4001D


InPhase IPA4001D

InPhase amplifiers are made to rock your world. With great muscle also comes refinement. Advanced features such as bass boost, fully variable zero to 60Hz subsonic filters and crossover networks with different frequency bands for highpass and lowpass, you will always have full control. Connectivity is excellent with high level as well as RCA inputs and a pass through RCA output to feed more amps, without needing multiple runs of RCA cables. With 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. All the amps may be bridged for even more power into one channel. Four and two channel designs, all with potent MOSFET power supplies, cover every need from single-amp whole system solutions, all the way to pavement-shaking power mania. There is always a high quality InPhase amplifier (or two) that’s just perfect for your hunger for power.
The New InPhase IPA range of amplifiers from InPhase is possibly one of the best car amplifiers available today. Car amplifiers are the heart of a system and need be of the best quality available for your budget. Inphase IPA range of car amplifiers have been renowned throughout the world and are rated very high by some of the most famous musicians like Akon.  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. The IPA range of car amplifiers gives you the true RMS power to power your system. Some of the amazing features of the new Inphase IPA range of amplifiers have a Subsonic filter so you can adjust your amplifier to deliver more power to the desire frequency range, which mean more power to your speaker. Line in and line out so you can run as many InPhase amplifiers as you want one a single RCA cable. Dual layer circuit boards for improved sound quality and low resistance from internal parts give you a smaller and yet more powerful amplifier.


Download image of In Phase Car Audio IPA4001D Click here for Image of In Phase Car Audio IPA4001D
Technical Specification
Key Features: 
  • 1200w RMS x1 @ 4 ohms
  • 2300w RMS x1 @ 2 ohms
  • 4000w RMS x1 @ 1 ohms
  • 8000 Watts Max Power
  • Regulated power supply
  • MOSFET power supply
  • Oversize Power Tranformer
  • Bipolar Output devices
  • Dimensions (L x W x H) 480mm x 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
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Customer reviews

In phase, power drive 5000
Hussein. on 11/05/2019 5 star rating

This amp is so powerful. I got this amp to run my baceface 15" 3500watt RMS hammer series sub and there is no lag with plenty of power to spear. This is a super amp. Highly recommended.

power full
terry on 29/05/2015 4 star rating

This amp is very strong and power full. Controls the woofer to a tee. Loads of adjustment. Ive ran it at 1 ohm seams to be hold up to the challenge.

Powerfull !
Tom on 02/10/2014 5 star rating

I brought one of these to Power a DB audio Xtinct. I had it installed at the Leicester shop. OMG this amp pushed my bass to another level! 100% recommended !

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Questions/Answers About This Product
  • Question: 07 September 2018
    Car: Ford Fiesta - <2003

    At the moment ive got an alpine TypeR12 on a D8601 at 1ohm and looking for a bit more punch
    The D8601 is 800WRMS at 1ohm so going to 800-900 isnt going to upgrade
    Ill do some research, thanks

    Let us know if we can be any help.

    Found Useful? Yes 

  • Question: 06 September 2018
    Car: Ford Fiesta - <2003

    A review on the 2001D says a true RMS figure of 900 at 1ohm, not 2000
    Is the 2000 max or RMS?
    TBH, i want a lot of power on a budget, thanks again

    your rms figure would vary dependent on the power provided, amplifiers are tested inside a vehicle, they are usually tested on a bench that has a lot bigger power supply and more stable voltage to give there readings, if your putting a single subwoofer on this amplifier at 1 ohm in a ford fiesta you will have plenty of bass

    Found Useful? Yes 

  • Question: 06 September 2018
    Car: Ford Fiesta - <2003

    How would this amp pair with the T-Rex12 3000W? Planning to wire it all up at 1ohm. Is the 4000w@1ohm CEA? Would the IPA2001D be better suited?
    Currently running 4awg to the boot does amp take it?

    ideally a 4gauge would be suited to the 2001d not the 4001d, the trex would run 1 ohm ideally on the 2001d but on the 4001d we would recommend 4ohm as the rms would be 4x that required of the 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:

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