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Kenwood KAC-8103D

Mono subwoofer amplifier
500 watts RMS x 1 at 2 ohms (New stock)

Item # 113KAC8103

Kenwood built the KAC-8103D amplifier from the ground up to power your subs with authority.

Find what Fits your vehicle

Kenwood built the KAC-8103D amplifier from the ground up to power your subs with authority.

Need help?
Contact our Virginia-based experts.
Discontinued item

Item # 113KAC8103

Need help?
Contact our Virginia-based experts.

About the Kenwood KAC-8103D

Kenwood built the KAC-8103D amplifier from the ground up to power your subs with authority. Its rugged cast-aluminum chassis houses an efficient mono power amp that'll punch out up to 500 watts RMS without putting a strain on your car's electrical system.

Kenwood built the KAC-8103D amplifier from the ground up to power your subs with authority. Its rugged cast-aluminum chassis houses an efficient mono power amp that'll punch out up to 500 watts RMS without putting a strain on your car's electrical system.

A built-in low-pass filter adjusts amplifier output so you'll get the best sound possible from your subwoofer/box combo, while the subsonic filter eliminates inaudible, ultra-low bass that can detract from your sub's performance. You can dial in up to 18 dB of bass boost if you want to fatten up the sound.

The top-mounted controls allow you to tweak the sound easily, and convenient front-side connections make setup a snap. Speaker- and preamp-level inputs, plus preamp outputs, provide flexibility in system design and hookup.


Product highlights:

  • mono subwoofer amplifier
  • 300 watts RMS x 1 at 4 ohms (500 watts x 1 at 2 ohms)
  • CEA-2006 compliant
  • variable low-pass filter (50-200 Hz at 24 dB per octave)
  • bass boost (0-18 dB at 40 Hz )
  • subsonic filter (15/25 Hz, 18 dB/octave )
  • Class D design
  • speaker- and preamp-level inputs
  • preamp outputs
  • fuse rating: 40A x 1
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 12-7/16"W x 2-1/2"H x 11-11/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # KAC-8103D

What's in the box:

  • Mono amplifier with one 40-amp fuses inserted into the chassis
  • Speaker-level input harness
  • 4 Self-tapping screws
  • 2 Rubber terminal covers
  • Instruction Manual (English/French/Spanish)
  • Warranty Card

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More details on the Kenwood KAC-8103D

Mark G.

Product Research

Inputs and Outputs


CEA-2006 Compliant: CEA-2006 is a new system of testing and measurement methods for mobile audio amplifiers. This voluntary standard advocates a uniform method for determining 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 (THD) plus noise, and at a frequency range of 20 Hz to 200 Hz 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. The Kenwood KAC-8103D under CEA-2006 regulations is rated at 300 Watts RMS x 1 channel with a 85dBA signal to noise ratio.

Mono-Power Amp Design: The Kenwood KAC-8103D is designed with specific features to power your subwoofers with a frequency range between 5-200 Hz. This amplifier is not designed to power a full-range speaker.

2-Ohm Stable: The Kenwood mono-amplifier is capable of handling load impedances down to 2-ohms. The amplifier is rated at 500 Watts RMS x 1 channel in 2 ohms at 100Hz with 0.8% THD.

Class D Amplifier Design: The KAC-8103D is a Class D mono-block amplifier, which uses digital switching to amplify audio signals. This design results in high efficiency and less heat.

MOS-FET Switching Power Supply: The amplifier utilizes a MOS-FET switching power supply providing thermal stability and efficient switching speeds guaranteeing performance and dependability.

Parallel Connection: The amplifier is equipped with two pairs of gold-plated speaker terminals for an easy parallel subwoofer connection.

Low-Pass Filter: The KAC-8103D has a built-in 24dB/octave low-pass filter that is continuously variable from 50Hz to 200Hz.

Bass Boost: The bass boost is adjustable from 0-18dB at 40Hz.

Infrasonic Filter: This amp features an 18dB/octave Infrasonic Filter. Ultra-low frequencies that cannot be reproduced by a subwoofer do not become sound but become unnecessary oscillations, which affect sound by causing distortion. These frequencies also waste amplifier power and can cause damage to speakers. Setting the Infrasonic filter switch to 15Hz or 25Hz cuts the frequencies below the respective frequency to improve the reproduction performance of the speakers by eliminating harmful distortion.

Line Level Inputs: The RCA type line-level inputs have a gain (Input Sensitivity) control. The Input Sensitivity control will accept an input signal of 200mV to 5.0 Volts.

Speaker Level Input: The KAC-8103D comes with a speaker level input harness. This feature makes it easier to add an amplifier to a factory radio or to a receiver with no preamp outputs.

Line Level Output: The amplifier has a set of 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.

Power Indicator: When the power is turned on to the amplifier, the Power indicator will light up. This indicator will turn off with the amplifier and will turn off if the amplifier goes into protect mode.

Protection circuitry: The amplifier features protection circuits that will turn the amp off in case of the following events to protect the amplifier and your speakers:

  • Speaker output contacts ground
  • Speaker wire short-circuits
  • Unit malfunctions and DC is sent to speaker output
  • Internal temperature is too high
  • Loss of ground of head unit or amp


Front of the Amplifier: All of the amplifier's controls are found on the front of the amplifier.

  • Bass Boost Level: 0-18 dB
  • Low Pass Frequency: 50-200 Hz
  • Input Sensitivity: 200mV-5V
  • ISF Switch: 25Hz, 15Hz or off

Inputs and Outputs

Front of the Amplifier: All of the amplifier's connections are found on the front of the amp.

  • Fuses: One 40A fuse
  • Power: Gold-plate screw terminal (0.5625" wide)
  • Ground: Gold-plate screw terminal (0.5625" wide)
  • Remote Turn-on: Gold-plated screw terminal (0.3125" wide)
  • Speaker Outputs: Two pair of gold-plated screw terminals (0.3125" wide)
  • Line In: One pair of gold-plated RCA inputs
  • Line Out: One pair gold-plated RCA outputs
  • Speaker-level Input: Multi-pin input for use with included speaker level input harness

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