The compact chassis of each Kicker IX Series amp hides a technical powerhouse. Kicker uses high-current design combined with efficient Class D technology to unleash more wattage per cubic inch than just about any other amp around. And an IX Series amp runs so cool you can stack multiple amps together for a professional-looking installation.

The IX500.4 4-channel amplifier delivers 75 watts RMS to each of your car's front and rear speakers. The low- and high-pass filters sculpt the sound so you can get maximum performance from your system, while a variable bass boost helps you dial in just the right amount of low-frequency punch. Noise-reducing technology removes interference from your car's electrical system as it enters the amp's inputs, so that your speakers see the purest signal possible.

Product Highlights:

  • 4-channel car amplifier
  • 75 watts RMS x 4 at 4 ohms (125 watts x 4 at 2 ohms)
  • 250 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
  • variable high- and low-pass filters (50-200 Hz at 12 dB per octave)
  • variable bass boost (0-18 dB at 40 Hz)
  • full-range Class D design
  • CEA-2006 compliant
  • balanced differential inputs
  • speaker-level inputs (requires an optional adapter)
  • preamp inputs and outputs
  • 4-gauge power and ground leads and a 50-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 50-amp in-line fuse between the distribution block and the amplifier is recommended
  • optional IX mounting kit required for stacking amps
  • 11-5/16"W x 2-3/16"H x 8-1/2"D
  • warranty: 2 years (3 years when used with a Kicker amp wiring kit)
  • Our 60-day money-back guarantee

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.

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Hands-on research

What's in the box?

Download owner's manual

  • 4-Channel amplifier
  • Four 2" self-tapping screws
  • 4 Flat washers
  • Hex-key
  • Instruction Booklet (Eng/Fre/Spa)
  • Certified Power Certificate

Product Research



Class D Amplifier Design: The Kicker IX500.4 is a full-range Class D amplifier, which uses digital switching to amplify audio signals. This design results in high efficiency and less heat. The Class D design also allows the IX500.4 to have a super-small footprint for fuel savings and increased cargo space.

CEA 2006 Compliant: The Kicker IX500.4's power ratings are measured according to the strict standards dictated by the Consumer Electronics Association (CEA). These standards allow you to accurately compare the rated power output of all CEA 2006-compliant amplifiers, even if they come from different brands. Manufacturers who adhere to the standards can display the CEA 2006 logo on their products and packaging.

Kicker Livin' Loud Certified Power Certificate: The amplifier comes with a certificate that indicates 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.

Amplifier Rating: The Kicker IX500.4 four-Channel amplifier is bridgeable (4-ohm), as well as 2-ohm stable in stereo.

  • Four-Channel (CEA 2006 Compliant): 75 watts x 4 channel RMS @ 4 ohms (20-20,000Hz, 1% THD)
  • Four-Channel (2-ohm): 125 watts x 4 channel RMS (20-20,000 Hz, 1% THD)
  • Bridged (4-ohm): 250 watts x 2 channel RMS (20-20,000 Hz, 1% THD)
  • Peak Power: 125 watts x 4 channel (500 watts total max power)

Auto Turn-On: The Auto Turn-On switch offers three options:

  • +12 V: The amp turns on when +12 volts is applied to the remote terminal.
  • DC Offset: The amp turns on when a 6 volt surge is detected on the signal inputs (from a speaker-level source); in this mode the amp's remote terminal acts as a +12 volt output to turn on another component.
  • Audio: The amp turns on when an incoming audio signal is detected; in this mode the amp's remote terminal acts as a +12 volt output to turn on another component.

Soft-Start Circuitry: The Kicker IX500.4 contains "soft-start" circuitry that lessens initial shock load when powering up the amplifier, and a muting circuit to eliminate audio distortion that might surge down the line.

Protection Circuitry: The IX500.4 has protection circuitry that will turn the amp off in the event of overheating, over voltage (power input), under voltage (power input), short circuit (speaker output), and over current (speaker output). If the Protection LED on the front side of the amp illuminates red, the protection circuit has engaged and the amp will not play until the problem is resolved.

Stackable: The optional Kicker IXSM stacking mount (206IXSM, sold separately) allows you to stack two Kicker IX-series amplifiers on top of one another.


Gain: To accommodate the varying range of signal levels coming from today's factory and aftermarket radios, the Kicker IX500.4 features an adjustable, independent gain control (low level: 125mV-5V; high level: 250mV-10V) for the front and rear channels. This means that no matter what kind of radio is connected to this amplifier, the appropriate gain control adjustment can be made to ensure loud, clear, distortion-free music.

Crossover: The front and rear amplifier channels have independent crossover settings. The internal crossovers can be set for low-pass, high-pass, or full-range operation. The variable low-pass and/or high-pass crossover points can be set between 50 and 200 Hz; the crossover slope is 12 dB per octave.

Bass Boost: The front and rear amplifier channels have independent bass boost settings. The bass boost circuit provides a variable (0-18 dB) signal boost at 40 Hz.

Fader: When powering four speakers, turn the fader switch On to maintain front/rear fader control.


Power Connections: The power and ground connections are set-screw terminals that will accommodate up to 4-gauge wire. The remote turn-on set-screw terminal will accept up to 8-gauge wire. The included allen-wrench is required to tighten/loosen the terminals.

Speaker Outputs: The Kicker IX500.4 is equipped with four pair of speaker terminals. All eight speaker terminals are set-screw terminals that will accommodate up to 8-gauge wire. The supplied allen-wrench is required to tighten/loosen the terminals.

Note: The speaker output terminals can be used in 4-channel mode or bridged to 2-channels.

Line Level Input: The four-channel amplifier is equipped with two pair of gold-plated RCA line level inputs.

Speaker-level Input: High-level inputs can be used when the source device doesn't have preamp level outputs. The same RCA inputs on the amp are used for either speaker-level or line-level connections. When a speaker-level signal is used, speaker wire to RCA adapters are needed (item number 136CLR2SW, sold separately) and the Input Level should be set to High.

Line Level Output: The amplifier has a pair of gold-plated RCA line level outputs for feeding a full-range stereo signal to another amplifier. It is the same signal that is input through the line inputs. The amplifier's crossovers have no effect on the line level output signal.

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