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Kicker KX300.4

38W x 4 Car Amplifier

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  • Kicker KX300.4

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Item #: 206KX3004
 
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Our take on the Kicker KX300.4

by Steven Johnson
Kicker

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.

Versatility, clean power, and a slew of features — Kicker's KX300.4 amplifier has it all! This rockin' 4-channel is jammed with features so it can be used in a variety of applications. Front and rear variable crossovers (50-200 Hz at 12 dB per octave) adjust the frequencies sent to the amp — you can set it up for full-range, high-pass, or low-pass operation. Groove with up to 18 dB of bass enhancement at 40 Hz with the adjustable bass boost.

Speaker-level inputs are provided for connection to a factory system (or any receiver without preamp outputs). Protection circuits shield the amp against potential damage from overvoltage, reverse voltage, and overheating.

Details:
  • 2-, 3-, or 4-channel output
  • Tri-way capable (Tri-Way crossover required)
  • 38 watts RMS x 4 at 4 ohms
  • 75 watts x 4 at 2 ohms
  • 150 watts x 2 in bridged mode
  • speaker- and preamp-level inputs
  • front and rear high-pass/low-pass crossovers (variable 50-200 Hz, 12 dB per octave)
  • front/rear bass boost (0-18 dB at 40 Hz)
  • frequency response 20-20,000 Hz
  • requires 8-gauge power and ground leads — wiring and hardware not included with amplifier
  • unregulated Class A/B power supply offers a significant increase in power at 2 ohms
  • 16-1/16"W x 2-5/8"H x 10-1/4"D
  • 1-year warranty
See more info on this item

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

Features and Specs
Performance
RMS Power Output (Watts x Channels) 38 x 4
Peak Power Output (Watts x Channels) 75 x 4
Power at 2 Ohms (Watts x Channels) 75 x 4
Bridged Power (Watts x Channels) 150 x 2
Minimum Impedance Bridged 4
Minimum Impedance Unbridged 2
Best Frequency Response 20-20kHz Hz
THD at Rated RMS Power 0.085%
Signal to Noise Ratio 95 dB
Input Voltage 13.8v
Features
Amplifier Class AB
Low-Pass Crossover Frequency 50-200Hz
Low-Pass Slope (dB/octave) 12dB
High-Pass Crossover Frequency 50-200Hz
High-Pass Slope (dB/octave) 12dB
Bass Boost 0-18dB
Bass Boost Frequency 40Hz
Fan Cooled Yes
Fuse Rating 20 x 2
Speaker Level Inputs Harnesses
Preamp Outputs No
Width (inches) 16-1/16
Height (inches) 2-5/8
Depth (inches) 10-1/4
Parts Warranty 1 Year*
Labor Warranty 1 Year*
Product Research
What's in the box?

Download owner's manual

  • One 4-channel amplifier with two 20-amp fuses in chassis
  • 6 Yellow crimp-on spade terminals
  • 2 Red crimp-on spade terminals
  • 1 Blue crimp-on spade terminal
  • 2 Spare 20-amp fuses
  • 2 Molex harness for speaker-level connection
  • Four 1/2" rubber washers
  • 4 Butt connectors
  • Four 7/8" mounting screws
  • 3mm Allen wrench
  • Manual
  • Warranty Registration Card (return for free Kicker decal and wearables catalog)
  • Certified Power certificate

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
Controls
Inputs and Outputs
Specifications
Warranty Note

Features

Cosmetics: The amplifier is black and it has a dark gray, removable metal shroud. Though this is one 4-channel amplifier, Kicker uses the terminology of "Amp 1" and "Amp 2" to indicate the channels. 

Amplifier Shroud: The amplifier has a metal shroud that must be removed before installation, allowing access to the amplifier's inputs and outputs. Once the amplifier is installed and all the connections are made, you can re-install the shroud to hide the connections on the amplifier, or leave the shroud off to save space. With the shroud removed, the amp has the following dimensions: 12.375"W (13.500" with RCA's) x  9.541"D x 2.313"H.

Kicker "Living Loud" Certified Power Certificate: The amplifier comes with a certificate that informs you of the total maximum wattage of the particular amplifier, along with the model number, serial number, tested date, and whether the amplifier passed the total harmonic distortion, signal-to-noise ratio, and protection circuit tests.

Speaker-level Inputs:  Two high-level input connections are included to allow use with sources that do not have RCA preamp level outputs. 

Built-in Variable Electronic Crossover: There are two built-in crossovers that allow you to select high-pass for satellite speakers, low-pass for subwoofers, or bypass for full-range operation. The crossover frequency is variable from 50 to 200Hz.

SORT (Short circuit, Over-voltage, Reverse polarity, Thermal) Protection Circuitry: The SORT protection circuitry guards against accidents and undesired operation. The Power LED on the left side of the amp glows green and the power indicator on top of the amp glows red when the amplifier is hooked up correctly and SORT has not been engaged. If the red Protection LED illuminates, SORT has been engaged and the amplifier is in protect mode until the problem is resolved.

KickBass Bass Boost: The two KickBass bass boost circuits provides up to 18dB signal boost at 40Hz.

SAMS (Stereo And Mono Simultaneously): With a Tri-mode adapter (item # 127TM100), this amplifier can run satellite speakers and a sub at the same time.

Controls

Top of Amplifier:

  • KickBass Bass Boost Control for Amp 2: rotary control that allows you to adjust the bass boost, centered at 40Hz, from 0 to +18dB
  • Gain Control for Amp 2: rotary gain control that allows you to adjust the output level
  • Variable Crossover Frequency Control for Amp 2: allows you to adjust the crossover frequency from 50-200Hz
  • KickBass Bass Boost Control for Amp 1: rotary control that allows you to adjust the bass boost, centered at 40Hz, from 0 to +18dB
  • Gain Control for Amp 1: rotary gain control that allows you to adjust the output level
  • Variable Crossover Frequency Control for Amp 1: allows you to adjust the crossover frequency from 50-200Hz

Right Side of Amplifier:

  • Two Crossover Mode Switch: allows you to select "Hi Pass", "Lo Pass", or Off. There is one switch for Amp 1 and one for Amp 2.

Inputs and Outputs

Left Side of Amplifier: 

  • 12+ (power): gold-plated screw terminal (terminal is 0.554" wide)
  • REM (remote turn-on): gold-plated screw terminal (terminal is 0.350" wide)
  • GND (ground): gold-plated screw terminal (terminal is 0.554" wide)
  • Fuse: two 20-amp fuses

Right Side of Amplifier:

  • Amp 1 Speaker Output: gold-plated screw terminal (each terminal is 0.350" wide)
  • Amp 1 High Level Input: Molex plug input for included harness
  • Amp 2 High Level Input: Molex plug input for included harness
  • Amp 1 RCA Input: gold-plated RCA line input jacks
  • Amp 2 RCA Input: gold-plated RCA line input jacks
  • Amp 2 Speaker Output: gold-plated screw terminal (each terminal is 0.350" wide)

Specifications

Dynamic Power Rating (measured at 14.4V):

  • Bridged Into A 4-Ohm Load: 150 watts x 2
  • Per Channel Into A 2-Ohm Load: 75 watts x 4
  • Per Channel Into A 4-Ohm Load: 60 watts x 4

Continuous Power Rating (measured at 13.8V):

  • Bridged Into A 4-Ohm Load: 150 watts x 2
  • Per Channel Into A 2-Ohm Load: 75 watts x 4
  • Per Channel Into A 4-Ohm Load: 38 watts x 2

Warranty Note

Warranty Note: The warranty on this amplifier is 1 year parts and labor. If installed by an authorized dealer, the warranty is extended to 3 years parts and labor.

 
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Add accessories for the Kicker KX300.4

Patch cables take the music from your stereo to the amplifier. Most amp wiring kits don't include them. See all categories & accessories

T-Spec 2-Channel RCA Patch Cables Available in 7 different lengths (14-foot)
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