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Kenwood KAC-8404

4-channel car amplifier
50 watts RMS x 4 (New Stock)

Item # 113KAC8404

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

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

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Discontinued item

Item # 113KAC8404

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About the Kenwood KAC-8404

Kenwood made their reputation building car amplifiers that offer no-nonsense reliability and superior sound quality. The compact KAC-8404 4-channel amplifier features a rugged cast-aluminum chassis more than 40% smaller than its predecessor, yet it'll still pump out 50 watts RMS to each of 4 channels — ideal for improving the performance of the front and rear speakers in your system. Or, you can bridge the amp to 2-channel mode and drive a couple of subs with 180 watts RMS each 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-8404 4-channel amplifier features a rugged cast-aluminum chassis more than 40% smaller than its predecessor, yet it'll still pump out 50 watts RMS to each of 4 channels — ideal for improving the performance of the front and rear speakers in your system. Or, you can bridge the amp to 2-channel mode and drive a couple of subs with 180 watts RMS each without straining your car's electrical system.

Built-in high- and low-pass filters adjust the amplifier output so you'll get the best sound possible from your speaker or subwoofer combo, while the variable bass boost lets you 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.

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Product highlights:

  • 4-channel car amplifier
  • 50 watts RMS x 4 at 4 ohms (75 watts x 4 at 2 ohms)
  • 180 watts RMS x 2 bridged output at 4 ohms (4 ohm stable in bridged mode)
  • 2-, 3-, and 4-channel operation
  • CEA-2006 compliant
  • high-pass (12 dB per octave) and low-pass (24 dB per octave) filters variable from 50 to 200 Hz
  • variable bass boost (0-18 dB at 40 Hz)
  • cooling fan
  • MOSFET power supply
  • speaker-level inputs with signal sensing turn-on
  • preamp-level inputs
  • fuse rating: 40A x 1
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 11-1/16"W x 2-5/16"H x 9-7/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # KAC-8404

What's in the box:

  • 4-channel amplifier with 40-amp blade fuse inserted into the chassis
  • Allen wrench
  • Speaker level input harness
  • Rubber terminal cover
  • Four 3/4" Self-tapping screws
  • Instruction Manual (English/French/Spanish)
  • Warranty information

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Features
Controls
Connections

Features

CEA-2006 Compliant: CEA-2006 is a new system of testing & 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 (for full range amplifiers) of 20 Hz to 20,000 Hz. 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-8404 under CEA-2006 regulations is rated at 50 Watts RMS x 4 channels with a 80 dBA signal to noise ratio.

Bridgeable: The Kenwood 4-channel amplifier features two stereo amplifiers inside one chassis that not only can be used in a 4-channel configuration but also can be bridged and used in a 2-channel or 3-channel configuration. The amplifier is rated at 180 Watts x 2 at 4 ohm in 2-channel mode and 50 Watts x 2/180 Watts x 1 at 4 ohm in 3-channel mode.

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.

Control Cover: The Kenwood KAC-8404 features a brushed aluminum top cover that conceals all of its controls. This provides a very clean look as well as protects the amplifier's controls from being accidentally changed. The cover is held in place by two hex head screws. An allen-wrench is supplied to remove the cover.

Crossovers: The KAC-8404 has built-in high pass and low pass crossovers. The high pass crossover's slope is 12 dB/octave and is continuously variable from 50Hz to 200Hz and can be controlled independently for the A (Front) and B (Rear) channels. The low pass crossover's slope is also 12 dB/octave and continuously variable from 50Hz to 200Hz and can be controlled independently for the A (Front) and B (Rear) channels. The amplifier can also be operated at full-range simultaneously for both A (Front) and B (Rear) channels.

Bass Boost: A fixed bass boost of 18dB at 40Hz can be engaged for Amplifier B (Rear) only. There is no bass boost for Amplifier A (Front).

Stereo/Mono Operation: You can independently switch Amplifier A (Front) and Amplifier B (Rear) from Stereo to Mono operation. When switched to Mono, the signal from the left channel input only is used.

Line Level Inputs: Amplifiers A (Front) and B (Rear) each have separate line-level RCA inputs with independent gain (Input Sensitivity) controls. The Input Sensitivity controls will accept an input signal of 200mV to 5.0 Volts.

Signal Sensing Speaker Level Input: The KAC-8404 comes with a 4-channel speaker level input harness.  This feature makes it easier to add an amplifier to a factory radio or 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.

Built-In Fans: There are two fans and two vents located on the back side of the amplifier to help dissipate heat and ensure cool, reliable operation. Make sure not to block these vents or fans when you install the amplifier.

Power Indicator: When the power is turned on to the amplifier, the Power indicator will light up red. 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

Top of the Amplifier: All of the amplifier's controls are found on top of the amp under the removable brushed aluminum cover.

  • A-Channel Crossover: High Pass/Low Pass/Off
  • A-Channel Operation Mode: Stereo/Mono
  • A-Channel Crossover Frequency: 50-200 Hz
  • A-Channel Input Sensitivity: 200 mV-5 V
  • B-Channel Crossover: High Pass/Low Pass/Off
  • B-Channel Operation Mode: Stereo/Mono
  • B-Channel Crossover Frequency: 50-200 Hz
  • B-Channel Input Sensitivity: 200 mV-5 V
  • Bass Boost (B-Channel only): On/Off

Connections

Front of the Amplifier: All of the amplifier's connections are found on the front of the amplifier for easy access.

  • Fuse: 40 amp
  • Power: Gold-plated screw terminal (0.5625" wide)
  • Ground: Gold plated-screw terminal (0.5625" wide)
  • Remote Turn-On: Gold-plated screw terminal (0.3125" wide)
  • Speaker Outputs: Gold-plated screw terminals (0.3125" wide)
  • A and B Line In: Two pair of gold-plated RCA inputs
  • Ground Screw: Phillips-head screw for RCA signal ground if needed
  • Speaker-Level Input: Multi-pin input for use with included speaker level input harness

Note: The amplifier features a brushed aluminum top cover used to hide the unit's controls and which also 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 connections and control adjustments are made, the top cover should be re-installed.

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