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CEA-2006 Compliant: CEA-2006 is a 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 plus noise (THD+N), and over 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 standards allow
consumers to compare car amplifiers and receivers under the same conditions (apples
to apples). The Kenwood KAC-2404S under CEA-2006 regulations is rated at 40 watts
RMS x 4 channels with an 80 dBA signal to noise ratio. The signal to noise ratio
at the rated power output (not CEA-2006 conditions) is 95 dB.
2-Ohm Stable: The amplifier can support a 2-ohm load when
not bridged; the 2-ohm power output is 60 watts RMS x 4 channels.
Bridgeable: Either side (or both sides) of the four-channel
amplifier can be bridged to a 4-ohm mono load; the bridged output is 130 watts x
2 channel RMS.
Cast Aluminum Heat Sink: The KAC-2404S utilizes a cast
aluminum heat sink design to ensure the amplifier stays cool.
Protection circuitry: The amplifier features protection
circuits that will turn the amp off in case of the following events:
- speaker output contacts ground
- speaker wire short-circuits
- unit malfunctions and DC is sent
to speaker output
Power Indicator: When the amplifier is turned on the Power
indicator (on top of the amp) lights up red. This indicator turns off with the
amplifier, and will turn off if the amplifier goes into protect mode.
Gain: The A and B sides of the amplifier have independent
input gain controls; both 0.2-5.0 volts (RCA).
High Pass Crossover: The A side of the amplifier has a fixed
80 Hz, -12 dB/oct high-pass filter which can be turned On or Off.
Low Pass Crossover: The B side of the amplifier has a
continuously variable (50-200 Hz) low-pass crossover. The slope is -18 dB/oct
and the crossover can be turned On or Off.
Power Connections: The power and ground connections are
0.55" wide screw terminals; the remote turn-on connection is a 0.35"
wide screw terminal. A Phillips-head or flat blade screw driver (not supplied)
is required to tighten/loosen the terminals. Spade connectors are recommended.
Minimum 10 gauge wire is required for power and ground.
Speaker Outputs: The four pair of speaker outputs are 0.35"
wide screw terminals. A Phillips-head or flat blade screw driver (not supplied) is
required to tighten/loosen the terminals. Spade connectors are also recommended for
the speaker wires.
Note: Each set of speaker output
terminals can be used in stereo or bridged mode.
Line Level Inputs: The KAC-2404S' A and B sides each have
stereo RCA line-level inputs with independent gain (Input Sensitivity) controls.
The inputs will accept signals of 0.2 volts (200mV) to 5.0 volts.
Speaker Level Input: A five-pin (four channel) harness is
included for the speaker level input. The input harness is common ground; it
will not accept floating ground outputs.
Fuse: The amplifier uses a 30-amp ATO blade-type fuse.