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Kenwood Excelon XR400-4

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

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  • Kenwood Excelon XR400-4

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  • Kenwood Excelon XR400-4

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  • Kenwood Excelon XR400-4

  • Kenwood Excelon XR400-4

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Item# 613XR4004
 

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Our take on the Kenwood Excelon XR400-4

by Dave Delamere

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

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. And Kenwood protects this sharp-looking amp with its Excelon 2-year warranty.

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.

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
 

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Performance
RMS Power Output (Watts x Channels)
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75 x 4
Peak Power Output (Watts x Channels)
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N/A
Power at 2 Ohms (Watts x Channels)
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100 x 4
Bridged Power (Watts x Channels)
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200 x 2
Minimum Impedance Bridged
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4
Minimum Impedance Unbridged
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2
Best Frequency Response
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20-20k Hz
THD at Rated RMS Power
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1%
Signal to Noise Ratio
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76 dB
Input Voltage
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14.4v
Features
Amplifier Class
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D
Low-Pass Crossover Frequency
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50-200 or 2.5k-10k
Low-Pass Slope (dB/octave)
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12 dB/octave
High-Pass Crossover Frequency
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50-200 or 2.5k-10k
High-Pass Slope (dB/octave)
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12 dB/octave
Bass Boost
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No
Bass Boost Frequency
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N/A
Fan Cooled
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No
Fuse Rating
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60
Speaker Level Inputs
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No
Preamp Outputs
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No
Width (inches)
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8-11/16
Height (inches)
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1-7/16
Depth (inches)
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8
Parts Warranty
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90 Days
Labor Warranty
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90 Days
Product Research
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

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 open the box, verify contents, 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.

Features

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.

Controls:

  • 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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Kenwood Excelon XR400-4 Reviews

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5 out of 5

Excellent Product

Written By Tom L, Avon, CO on Wednesday, October 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
4 out of 4 people found this helpful
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