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Kenwood KAC-8104D

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

Item # 113KAC8104

Kenwood made their reputation building car amplifiers that offer no-nonsense reliability and superior sound quality.

Find what Fits your car

Kenwood made their reputation building car amplifiers that offer no-nonsense reliability and superior sound quality.

Discontinued item

Item # 113KAC8104

About the Kenwood KAC-8104D

Kenwood made their reputation building car amplifiers that offer no-nonsense reliability and superior sound quality. The compact KAC-8104D mono amplifier features a rugged cast-aluminum chassis more than 30% smaller than its predecessor, yet it'll still punch out up to 500 watts RMS to your subwoofers without straining your car's electrical system.

Kenwood made their reputation building car amplifiers that offer no-nonsense reliability and superior sound quality. The compact KAC-8104D mono amplifier features a rugged cast-aluminum chassis more than 30% smaller than its predecessor, yet it'll still punch out up to 500 watts RMS to your subwoofers without straining 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 front-mounted controls allow you to tweak the sound easily, and convenient front-side connections make setup a snap. Signal sensing turn-on and speaker-level inputs allow these amps to hook up to factory radios that don't have preamp level outputs.

Confused about impedance? Check out our article on matching subs and amps.

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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-level inputs with signal sensing turn-on
  • preamp-level inputs and outputs
  • fuse rating: 40A x 1
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 11-1/16"W x 2-3/8"H x 9-7/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # KAC-8104D

What's in the box:

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

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Features
Controls
Connections

Features

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-8104D under CEA-2006 regulations is rated at 300 Watts RMS x 1 channel with a 83dBA signal to noise ratio.

Mono-Power Amp Design: The Kenwood KAC-8104D 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-8104D 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-8104D 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.

Signal Sensing Speaker Level Input: The KAC-8104D 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. You don't need to connect the remote turn-on wire when using the speaker-level input harness because the power of the amplifier is turned "On" and "Off" as the amp detects input signal from the unit's speaker level input.

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. The amplifier also features a Blue LED lamp on the top of the amplifier which illuminates when the amplifier is on.

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

Controls

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

Connections

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

  • Fuse: 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

Note: The amplifier features a brushed aluminum top cover which needs to be removed to access the Power, Ground, Turn-on, and Speaker terminals. The cover is held in place by two small hex-head screws which are removed using the supplied hex-key. Once all connection are made, the top cover should be re-installed.

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