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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%
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
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
- 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:
- ISF Switch: 25Hz, 15Hz or
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)
Turn-on: Gold-plated screw terminal (0.3125"
- 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.