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Kenwood Excelon XR400-4

4-channel car amplifier — 75 watts RMS x 4 (Factory Refurbished)

19 Reviews | 5 questions - 18 answers


Our take on the Kenwood Excelon XR400-4

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: 90 days
  • Our 60-day money-back guarantee

Excellent buy, very happy with purchase.

Anonymous, Visalia, CA

What's in the Box:

  • Refurbished 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

Kenwood Excelon XR400-4 Reviews

Average Customer Review(s):

(19 Reviews)

Was a Failure Twice (refurbished)

Landon from Des Moines, IA on 9/23/2017

Crutchfield Customer Review (What's this?)

I ordered this amp to go with two Kenwood 6.5's and two kenwood 6x9's in a box. Now this is my first amp install so I may have done it wrong, but the sound quality was awful. After doing all the wiring I was tightening down the screws that hold the speaker wires/power wires in place. Half of the heads on the screws stripped from normal tightening (this was just a test fit and therefore weren't being tightened remotely hard). Crutchfield being the awesome company they are let me return it, but when installing the replacement, the heads stripped again, even though I was being very careful. I love kenwood and I love Crutchfield but the quality control on these refurbished models in non existent, and not worth the time or effort when you can buy a million other products that actually work.

Pros: Small size, clean look.

Cons: Screws that tighten down the speaker wires stripped on both units I received, the surface of the amp was scratched, very disatified.

Love it!

Carl from Shrewsbury, MA on 8/8/2017

I've been using Kenwood amps for almost 20 years, and for the money, you can't beat them! I'm running 2 sets of kicker ks 6X9's and they're loud, and crystal clear!! I have the matching mono amp (Xr600-1) and my car sounds mint! Very impressed with this amp, especially for the size and price. Nice job Kenwood and Crutchfield.

Pros: Everything!

Cons: None

Kenwood Excelon XR400-4

charles from Houston, TX on 5/20/2017

Crutchfield Customer Review (What's this?)

I have used Kenwood for years and to be honest, this amp is right in line with all of their other products. I have mine powering 4 Polk Audio 5"X7"'s in my '07 Ford F150 and it gives them every drop of watts needed to make them sound great. Compact enough to fit behind my rear seat and runs cool considering how hard I drive it. Power is clean at all volume levels, including the ones that make your ears hurt. I would definitely recommend this to anyone looking for a compact and powerful amp.



Kenwood Excelon XR400-4

Anonymous from Visalia, CA on 2/28/2017

Crutchfield Customer Review (What's this?)

Excellent buy, very happy with purchase.




Forest from Kentucky on 2/3/2017

Crutchfield Customer Review (What's this?)

Great Lil amp


Cons: Non

Kenwood Excelon XR400-4

Anonymous from Roanoke va on 1/18/2017

Crutchfield Customer Review (What's this?)

Great clean sound would buy again and may for another car



Could be great deal but...

J.R. from San Antonio, Tx on 1/5/2017

Crutchfield Customer Review (What's this?)

Might be a good amp, I don't know. I got this to save a few bucks and I guess I didnt get the lucky draw. I had it 90% installed, mounted and ready to roll and when I went to put in the last set of speaker wires, the allen head screw was tightened down like the other but it was stripped. I own a lot of tools and was willing to do whatever it took to get that screw out. However, there was just nothing at all to grab on to since the screws are countersunk and rounded off. BUMMER! Upon removing from box, I saw it had more blemishes than I would usually accept on a refurb item BUT since it was going to be behind the back seat of an f150 supercab and never seen, I figured I could live with it. Nail in the coffin was the stripped screw head. * Packing from kenwood I assume was a cardboard box, filler cardboard strips on either side of the amp and peanuts. No plastic over the amp either. Was packing like you would see if you ordered it offline from an individual. The guys at Crutchfield were nice about letting me send it back. I chose to buy new instead and not kenwood model.

Pros: Priced well, low profile, clean look

Cons: Packaging was sub par, Quality control was not what it should have been from a name like kenwood.

Great amp for the price!

Matt H from jackson, MS on 3/28/2016

Crutchfield Customer Review (What's this?)

I purchased the Kenwood Excelon XR400-4 to replace a STEG 4.01 that had gone out in my 2001 Porsche 911 Carrera. So, everything was already wired, and ready for install. I simply used the included Allen wrenches to connect the wiring up and it was ready to go. The covered Allen bolts that clamp down on the wiring are great. This is much better than spring connectors or exposed screws. I'm not pumping big bass or anything like that. I'm pushing Focal speakers all around with cross-overs. I get plenty of power and the sound quality is still great. The form factor is MUCH smaller than the STEG it replaced. That made me a bit concerned about heat, but I haven't noticed much in the way of heat yet either.

Pros: Allen bolt connectors Tools included Small Form Factor for 75w RMS Good Power and Clarity

Cons: None so far!

Kenwood XR400-4

TeamUSA from San Francisco, CA on 3/3/2016

Crutchfield Customer Review (What's this?)

I have a 2013 Toyota Corolla S as my daily commute car. The deck I installed is a Kenwood Excelon DNX892 with Nav. I added a pair of Kicker component speakers in the front, and a pair of Kicker 6x9's in the rear. The system sounded good, but definitely lacked the punch and detail I wanted. So, I bought a refurbished XR400-4, and the sound is now much better. Clearer highs and punchier lows - no, not as good as having a subwoofer, though (that'll be the next project). This amp has such a small footprint, and has all the necessary frequency adjustments that I need for fine-tuning the sound. Just remember that the "Input Sensitivity" setting is not the same as a volume control - and so don't just turn that setting all the way up or you'll get unwanted distortion.

Pros: Small footprint for 75w rms, adjustability, clarity, great price for a refurb.

Cons: None so far.

Nice amp

Matt from Kentucky on 9/25/2015

Crutchfield Customer Review (What's this?)

Nice amp, fits in tight spaces

Pros: Small Powerful


Kenwood Excelon XR400-4

david from Virginia on 7/26/2015

Crutchfield Customer Review (What's this?)

I have 09 Silverado don't have a lot of room. used this amp for my door speakers .amp gets a little warm but sound great.




Don F from Napa CA on 7/21/2015

Crutchfield Customer Review (What's this?)

I have been in the market for a small for factor high quality amplifier for a year. The space this thing takes up is roughly equivalent to a paperback book . the speakers used are from PhD and cdt and were originally powered from the internal amplifier of a JBL MS8. Quality was the next deciding factor the Rockford fosgate pbr amps were contenders too but after reading about heat issues I was worried about degrading sound quality . that's where the Kenwood xr400-4 fell into play. It gets warm but never hot to the touch its tucked away in a tight spot but is a sleek looking amp to boot. The quality of sound and power driven to the speakers now is fantastic, it was like falling in love with the stereo all over.

Pros: Form factor and quality

Cons: Wish the xovers and gain knobs were on the top of the chassis

Don't buy refurbished!

Patrick from Hawaii on 7/12/2015

Crutchfield Customer Review (What's this?)

Amp came with stripped Allen head screws for speaker wire terminations. They are completely round.

Pros: Unknown. Couldn't even install.

Cons: Poor craftsmanship

Crutchfield response on 7/13/2015 Our customer support team set up a return for this customer. Refurbished products we sell come with the same 60-day return policy that new items do, so you can make sure you're satisfied with your purchase from Crutchfield.

Great price great amp!!

Mattdaddy82 from Alamogordo,NM on 8/19/2014

Crutchfield Customer Review (What's this?)

For the price this amp is amazing .. I usually go with a jl audio for my 4 channel but this one had decent reviews so I gave it a shot, that and my deck is an excelon .. I have this amp pushing a type r 6.5 component set in front and a alpine type r 5.25 set in rear .. More than enough power for all and the design profile is amazing it's small enough to fit under the dash in some applications .. I put mine under my seat so I can tune it easily

Pros: Price, size , look

Cons: Wish there were a bit more tuning options

Nice amp

Jeffrey812 from Sarasota FL on 8/4/2014

Crutchfield Customer Review (What's this?)

It's a nice amp,clean power.The output watts are way over rated I am using the amp to power infinity kappa 6x8 speakers and i would say you would be lucky to get 50 watt RMS at 2 ohm.But that's plenty for me.

Pros: Small footprint,Nice clean natural power

Cons: None

Very Nice

William T. from Orland Park, IL on 6/30/2014

Installed in a 2012 Sonata Turbo to power four Kenwood KFC-X173's. Plenty of power with clean sound. Small footprint is very nice.

Pros: Clean power / small footprint

Cons: None

Nice for the price

Negolien from Sacramento,CA on 5/21/2014

Crutchfield Customer Review (What's this?)

I purchased this as a refurb. The packaging was pretty bad to be honest. Not on par with the normal packaging I have received from Crutchfield. It seems the item was shipped back from Kenwood to Crutchfield in a box with no peanuts or wrapping of any kind thus the amp was slamming around inside a box about 2-3 inches larger than the amp all the way around. When it was shipped to me that box was stuffed into a much larger box filled with peanuts. Still slamming around inside the smaller box... Very poor Packing by the Shipping and receiving department. The item itself was a great product by a great Company. I paired this to run a pair of Polk DB461's and a pair of Infinity Kappa 93.11i's with a KAC-8105D that runs my 2 12" MTX JH45's. Superb value in size and features. The ability to run one set of RCA's in to power two separate pairs of speakers yet be able to use the pass filters = awesome. you can run 4 pairs of speakers on a 6 output headunit which is a super value if you want to run kicker area component speakers, door speakers and a sub. The amp itself worked fine for a refurb I have no issues and you can't beat it for the price. Both my amps are Kenwood's and they are great bang for the buck. I would not hesitate to recommend the product.

Pros: Size is awesome a very very compact amp perfect for the two sets of cab speakers.

Cons: A little pricay brand new but that's why I went for the refurb. Hey can't beat that price with a stick.

Kenwood Excelon XR400-4

Shaunt317 from Indianapolis on 4/21/2014

Crutchfield Customer Review (What's this?)

Great amp. It sounds amazing and has plenty of power.

Pros: Easy connections.


Excellent Product

Tom L from Avon, CO on 10/23/2013

Crutchfield Customer Review (What's this?)

This amp lives up to the Kenwood reputation of producing clean, distortion-free sound. It's small profile makes for an easy install beneath the seats, and the adjustment options are plentiful and effective. I've tried other products, but I always come back to Kenwood.

Pros: Clean sound, ample power, small size and ample adjust-ability.

Cons: None


Hands-on research

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

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

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 ]
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

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 ]
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 ]
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 ]
This isn't a good amp for use with subwoofers. I would recommend something like this instead. 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 ]
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