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Kenwood Excelon XR400-4

4-channel car amplifier — 75 watts RMS x 4

Item # 613XR4004

Kenwood's Excelon XR400-4 4-channel amplifier adds clarity and punch to your car's audio system, as it powers each...

Read more from Crutchfield writer, Buck P.

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About the Kenwood Excelon XR400-4

Super-slim profile, big-time power

Kenwood's Excelon XR400-4 4-channel amplifier adds clarity and punch to your car's audio system, as it powers each of your front and rear speakers with 75 watts RMS. As your system changes, you can also use the XR400-4 in 2-channel mode to drive a couple of subs with up to 200 watts RMS each. The XR400-4 can fit in many different places in your car because of its incredibly low profile — it's under 1-1/2" tall.

Super-slim profile, big-time power

Kenwood's Excelon XR400-4 4-channel amplifier adds clarity and punch to your car's audio system, as it powers each of your front and rear speakers with 75 watts RMS. As your system changes, you can also use the XR400-4 in 2-channel mode to drive a couple of subs with up to 200 watts RMS each. The XR400-4 can fit in many different places in your car because of its incredibly low profile — it's under 1-1/2" tall.

Designed for optimum efficiency

Kenwood packed this amp with space-saving features. Class D technology reduces the size of the power supply, while the internal heatsink is tilted to reduce height without compromising the amp's cooling system. Recessed power and speaker wire terminals help to further reduce the amp's footprint, protect the connections, and give your installation a neat, professional look.

Controls for the best sound — bi-amp capable

You can contour the sound with high- and low-pass filters so your speakers play efficiently and sound their best. The front and rear channels have separate gain and filter controls so you can adjust for different types of speakers. The XR400-4 also gives you the ability to "biamp" your system, amplifying the tweeters and woofers separately for greater power and control over the sound.


Product highlights:

  • 4-channel amplifier
  • 75 watts RMS x 4 at 4 ohms (100 watts RMS x 4 at 2 ohms)
  • 200 watts RMS x 2 bridged output at 4 ohms (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • variable high- and low-pass filters (50-200 Hz; 2.5K-10k Hz, 12 dB/octave)
  • Class-D amplifier design
  • frequency response: 20-20k Hz
  • preamp inputs
  • fuse rating: 30A x 2
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 8-11/16"W x 1-7/16"H x 8"D
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # XR400-4

What's in the box:

  • 4-Channel amplifier
  • Two 30-amp mini blade fuses (installed)
  • 4mm Allen wrench
  • 2.5mm Allen wrench
  • 2mm Allen wrench
  • Four 5/8" Self-tapping screws
  • Instruction manual (English/ French/ Spanish)
  • Warranty card

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Customer reviews

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Kenwood Excelon XR400-4 Reviews

Average Customer Review(s):

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Product Research


CEA-2006 Compliant: CEA-2006 is a system of testing and measurement methods for mobile audio amplifiers. This voluntary standard advocates a uniform method for measuring an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts and the RMS power output is measured into a 4-ohm load, with 1% or less Total Harmonic Distortion plus noise (THD+N), and over a frequency range of 20 Hz to 20 kHz, when applicable. Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4 ohms. CEA-2006 allows consumers to compare car amplifiers and receivers on an equal basis. Using CEA-2006 criteria, the Kenwood XR400-4 is rated at 75 Watts RMS x 4 channels with a 76 dBA signal to noise ratio.

Specifications: The manual also lists these non CEA-2006 compliant specifications:

  • Power:
    • 2Ω: 100 watts x 4-channels (at 1 kHz, with no more than 1% THD, 14.4 volts)
    • Bridged: 200 watts x 2-channels (into 4Ω at 1 kHz, with no more than 1% THD, 14.4 volts)
  • Signal to Noise Ratio: 100 dB (at rated power)

Class D Amplifier Design: The amplifier design is Class D, which uses digital switching power supplies. The result is much higher efficiency (less heat generated) than Class AB.

4-Channel Amp: The front and rear sections of the amplifier (labeled A and B) have independent gain and crossover controls.

Crossovers: The front and rear crossovers can be independently set to high-pass, low-pass, or turned off (full range). The crossover points are continuously variable with a selectable range, from 50-200 Hz or 2.5-10 kHz and the slope is 12dB per octave.

Aluminum Heat Sink: The aluminum heat sink increases the amplifier's heat dissipation efficiency, increasing the life of the amplifier.


  • Input Selector: two position switch:
    • AB: separate inputs are supplied for the front and rear channels
    • A: the signal supplied to input A is fed to both front and rear outputs
  • Input Sensitivity: 200mV-5V; front and rear independently adjustable
  • Crossover: the front and rear channels have independent controls for these crossover functions:
    • Mode: high-pass, low-pass, or off (full range)
    • Frequency Range: low (50-200 Hz) or high (2.5-10 kHz)
    • Frequency: continuously variable; 50-200 Hz or 2.5-10 kHz, depending on the setting of the frequency range switch

Inputs and Outputs:

  • Signal Input: two pair of RCA preamp inputs; front and rear (labeled A and B)
  • Power: set screw terminal; accommodates bare wire up to 4-gauge
  • Ground: set screw terminal; accommodates bare wire up to 4-gauge
  • Remote Turn-on: set screw terminal; accommodates bare wire up to 10-gauge
  • Speaker Output: four pair of set screw terminals (left and right A channels and left and right B channels); accommodate bare wire up to 10-gauge
  • Fuses: two 30 amp mini blade fuses

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Customer Q&A

Crutchfield asked: Why did you buy this?
needed this for my subwoofer [ Robert  Jun 09, 2017 ]
Awesome and very sleek. One of the best looking amps on the market. [ Justin  Mar 19, 2016 ]
Have Kenwood components [ thomas  Nov 20, 2018 ]
Right size, right power, great price. [ Paul  Sep 21, 2018 ]
I recently installed a Kenwood 600-1 to replace my old Kenwood subwoofer amplifier. My experience with the better sound quality and small size convinced me it was time to replace my Alpine F240 with this kenwood 400-4. I run 2 kfc-xw10's and a DNX994S so now I'm 92% Kenwood with only my Infinity door speakers and crossovers as holdouts. [ Rob  Sep 13, 2018 ]
Price and already have a Kenwood DNS893S installed [ Ronald  Sep 05, 2017 ]
Why are you judging me I am lonely and shoppping make me feel special. [ DARRELL L  Feb 11, 2017 ]
price, size, reputation and ratings [ John  Jan 10, 2016 ]
Great price for higher end item. Return policy good so hopefully no quality worries. [ Patrick  Jan 10, 2016 ]

5 questions already asked

Looking to buy this amp just to power my speakers. I have 4 Kenwood KFC-X683C Excelon 6x8's. My concern is if the speakers are 3 ohms and the amp is 2 ohms with 4 channels will it be okay?
[ Michael  Sep 28, 2017 ]
3 answers
Perfectly fine. The Amp is rated down to 2 ohms so it will drive anything higher than 2 ohms. 100 watts RMS at 2 ohms, 75 watts RMS at 4 ohms. At 3 ohms the Amp will put out somewhere in between. Probably an RMS output of around 85 to 90 watts per channel at 3 ohms. The RMS rating on those 6x8's is 60 watts. This Amp will drive them hard. It's a great little amp. very clean. You could get away with a smaller amp for your application though.
[ Kenneth  Oct 01, 2017 ]
This amp will have no problem with a 3 ohm load in for channel mode.
[ Mike  Sep 30, 2017 ]
It will be fine. It will run at a minimum of 2 ohms. The amp power will be utilized according to the impedance presented to it.
[ Mike  Sep 30, 2017 ]
the size given in the overview don't match the ones in the owners manual. do you know which ones are correct? I a'm mounting an amp in a jeep wrangler and overall size is important.
[ douglas  Aug 06, 2016 ]
3 answers
for the one I installed last year the ones in the manual are correct.
[ johnny  Aug 10, 2016 ]
The user manual sizes are the correct ones to use.
[ NICHOLAS  Aug 07, 2016 ]
i will go measure it that wasnt a priority the quality is what does it for me
[ SPINNUCH  Aug 06, 2016 ]
would I be able to run 6 speakers off this amplifer without it getting hot?
[ will  Jan 29, 2015 ]
8 answers
I'm running a 10" sub and 2- 6" speakers off mine without any problems. It gets warm but no warmer than any other amp I've used in the past.
[ Randy  Jan 29, 2015 ]
I' am running a pair of Kappa 693.11i's and a pair of Polk DB461's. Amp runs like a champ. It's a 4 way so not sure how you're gonna run 6 speakers off of it unless you're just using a set of components.
[ christian  Jan 29, 2015 ]
I do not know, I just connect 4 speaker, and it work find in my Ford Ranger
[ Dan  Jan 29, 2015 ]
I am running 8 off mine. I believe I ran 2 in series on each channel to give you 8 ohm per channel.
[ Shaun  Jan 29, 2015 ]
Would say yes depending on what wattage speakers your running and what ohms. Hope this helps
[ Mathew  Jan 29, 2015 ]
I run (4) OEM speakers in my truck. At moderate volumes, the amp runs pretty warm / borderline hot. I have no idea what the impedance values are for these stock speakers, and suspect they're between 4-6 ohm. Note - my front set are separate bass/tweeter combo, but I consider them a single unit. Thus far, I haven't experienced any issues - but my installation is open and there's nothing restricting cooling. For you to run a pair of drivers off a single output means you would expect to see impedance numbers drop to the range of 1-2 ohms (if attaching in parallel), and I would expect that to increase demands on the amp (read - run even hotter). However, I suspect you may also run into audio imaging and balance/fader related issues with such an hookup.
[ steve  Jan 29, 2015 ]
It's only a four channel amp. So you can run your doors and rears just fine and add your tweeters in with your front doors and it will word just fine as long as you don't exceed the amp specs
[ Chase  Jan 29, 2015 ]
yes absolutely, i'm running 2 6x8's in the front and 4 6x9's in the back of my car off this amplifier and you can push it hard for extended periods of time and it only gets a little bit warm. definitely worth the money
[ ZACHARY  Jan 29, 2015 ]
How do I wire the kenwood xr400-4 to run two subs bridged?
[ Frederick  Feb 03, 2017 ]
3 answers
This isn't a good amp for use with subwoofers. I would recommend something like this instead. And why would you bridge 2 subs? Why not just run one sub on each channel?
[ Fisqual  Feb 03, 2017 ]
Look at where the speaker outputs for the speaker wire are. At the bottom it has two different bridged labels showing where to put your positive and negative speaker wire for each of the 2 subs. One sub will use the positive output of the left channel of A for the positive speaker wire and the negative output of the right channel in A for the negative speaker wire. The second sub will be hooked up the same but to B.
[ Wes  Feb 03, 2017 ]
Follow bridging instructions on amplifier, far positive to far negative. Set frequency to 80hz or lower on both channels. You may need a rca y adaptor to send signal to both channels on amp. But I recommend a mono sub amp.
[ Sean  Feb 03, 2017 ]
Do the filters effect the signal before being amplified? So this would be an active system? I would assume so but does anyone know for sure?
[ James  Nov 05, 2015 ]
1 answer
We don't have information on exactly how this is built internally so I cannot confirm exactly which way it works, but it would not make sense for the crossover to be applied after the amplification. Also, filtering the signal before its amplified is an active crossover.
[ Paul  Nov 09, 2015 ]  Staff

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