Inputs and Outputs Notes
Class AB/D Amplifier:
The hybrid design of the
Kicker KX550.3 amplifier combines the sound quality of "AB" amplifiers for the
stereo section (called "Amp 1"), and the efficiency of "D" amplifiers for the
EndKaps: The amplifier features
two removable, cast aluminum EndKaps that are mounted to each end of the
amplifier. These EndKaps protect and hide all of the wiring connections to the
amplifier, and must be removed before the amp is mounted. The EndKaps can be prepped and painted any custom color you choose.
They are mounted to the amp with 4 Allen-head screws (3mm Allen wrench
Forced Induction Cooling: To
keep the amplifier cool, the amplifier utilizes a forced induction cooling
system. When the internal temperature reaches a preset temperature, the built-in
fan automatically turns on to exhaust the hot air through the top vents and draw
in cool air from the side vents. As the temperature rises, the fan spins faster,
circulating more air to cool the amplifier.
Top-mounted Controls: The
features five rotary controls on the top panel: input gain control, bass boost
control and crossover frequency control for the sub section, and input gain
control and crossover frequency for the stereo amp section. These controls can be easily accessed,
even with the EndKaps installed.
Variable Low-Pass Filter: The
amp is equipped with a full-time variable low-pass filter for the sub section
which prevents unwanted high frequencies from reaching your woofers. The cutoff frequency is continuously variable from 50 to 200Hz
with a 12dB/octave slope.
Variable High-Pass Filter: In
addition to the low-pass filter for the subwoofer section, the "Amp 1" section
features a defeatable high-pass filter. the cutoff frequency is continuously
variable from 50 to 200Hz with a 12dB/octave slope. A switch on the side of the
amp allows you to turn off the filter for full-range operation.
KickBass Bass Boost: The
KickBass bass boost circuit provides up to 18dB signal boost at 40Hz.
Remote Bass Level Control:
The dash-mounted remote unit allows you to adjust the output level of the
amplifier. A 19.25' cable is included to allow you to control a trunk-mounted
amp from the front of the vehicle. Dimensions: W=2.2", H=1.186", D=1.736" (2.114"
including the knob).
Protection Circuitry: The SORT (Short circuit, Over-voltage,
Reverse polarity, Thermal) protection circuitry guards against
accidents and undesired operation. If the red Protection LED illuminates, SORT
has been engaged and the amplifier is in protect mode until the problem is
Kicker "Living Loud"
Certified Power Certificate: The
amplifier comes with a certificate that indicates the total maximum wattage
of your specific amplifier, along with the model number, serial number, tested
date, and whether the amplifier passed the total harmonic distortion,
signal-to-noise ratio, and protection circuit tests. In most cases, the
amplifier's certified power output surpasses the rated power.
and Outputs Notes
The KX550.3 uses custom-tooled, gold-plated connectors to assure maximum
power transfer and damping.
Set-Screw Power Terminals: The
power and ground set-screw terminals can accept up to 4-gauge bare wire. The
remote turn-on set-screw terminal can accept up to 12-gauge wire. A 3mm Allen
wrench is provided to tighten/loosen the set screws.
Speaker Terminals: The amp
utilizes terminal strip speaker terminals for the three speaker outputs. Six
12-gauge crimp-on spade connectors are included with the amp.
Inputs: High-level input connections
are included to allow use with a factory radio or other receiver without RCA preamp outputs. A 12" speaker-level input harness with a 4-pin Molex plug on
one end is provided. The receiver's speaker wires will need to be spliced to the
bare wires on the speaker-level input harness.
Line Inputs: Two pairs of RCA
line inputs are provided to allow you to separately feed preamp signals to the
stereo section and the sub section. There are no line outputs on this amp.
Note: The line-level and speaker-level inputs should never be used at the
- Input Voltage at 14.4 Volts:
- Amp 1 Section (1% THD+N)
- 70 watts x 2 RMS into 4
- 85 watts x 2 RMS into 2
- Sub Section (1.5%
- 210 watts x 1 RMS
into 4 ohms
- 420 watts x 1 RMS
into 2 ohms
- Input Voltage at 12.5
- Without EndKaps:
Width=15.75", Height=2.301", Depth=9.503"
- With EndKaps:
Width=19.1875", Height=2.519", Depth=9.913"