Class D Amplifier Design: The Kicker KX400.1 is a Class D
subwoofer amplifier, which uses digital switching to amplify audio signals. This
design results in high efficiency and less heat. The Class D design also allows
the KX400.1 to have a small footprint for increased cargo space.
CEA-2006 Compliant: CEA-2006 is a system of testing and
measurement methods for mobile audio amplifiers. This voluntary standard advocates
a uniform method for measuring 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 4Ω load, with 1% or less Total Harmonic
Distortion plus noise (THD+N), and over a frequency range of 20 Hz to 20 kHz (for
full range amplifiers). Signal-to-Noise ratio is measured in weighted absolute
decibels (dBA) at a reference of 1 watt into 4Ω. CEA-2006 allows consumers
to compare car amplifiers and receivers on an equal basis. Using CEA-2006 criteria,
the Kicker KX400.1 is rated at 200 Watts RMS x 1 channel with a 75 dBA signal to
Specifications: The manual also lists these non CEA-2006
- Power: 400 watts x 1-channel
(into 2Ω with no more than 1% THD+N, 14.4 volts)
- Signal to Noise Ratio: 95 dB (at
Kicker Livin' Loud Certified Power Certificate: The amplifier
comes with a certificate that indicates the total maximum RMS power output of the
particular amplifier, along with the model number, serial number, and whether the
amplifier passed the total harmonic distortion, signal-to-noise ratio, and protection
Low-Pass Filter: The Kicker KX400.1 is equipped with a low-pass
electronic crossover. This continuously variable low pass filter can be set between
40 Hz and 160 Hz with a slope of 24 dB/octave. Properly set, the low pass filter
creates a smooth transition between the subwoofer and the sound system's full-range
speakers. The low-pass crossover cannot by bypassed.
Subsonic Filter: The amp also features a 24 dB/octave subsonic
filter, continuously variable from 10 Hz to 80 Hz. Ultra-low frequencies that cannot
be reproduced by a subwoofer do not become sound, but unnecessary oscillations, which
affect sound by causing distortion. These frequencies also waste amplifier power and
can cause damage to speakers. The built-in subsonic filter removes the signal below
the set frequency to improve the performance of the speakers by eliminating harmful
distortion. The subsonic filter crossover cannot by bypassed.
Auto Turn-On: The Auto Turn-On switch offers three options:
- +12 V: The amp turns on when +12 volts
is applied to the remote terminal.
- DC Offset: The amp turns on when a 6 volt
offset is detected on the signal inputs (from a speaker-level
source); in this mode the amp's remote terminal acts as a +12
volt output to turn on another component.
- Audio: The amp turns on when an incoming
audio signal is detected; in this mode the amp's remote terminal
acts as a +12 volt output to turn on another component.
KickEQ+: The amplifier's KickEQ bass boost circuit is actually
a single band parametric equalizer. The center frequency, Q value, and boost level
are all adjustable.
Protection Circuitry: The KX400.1 has protection circuitry
that will turn the amp off in the event of overheating, over voltage (power input),
under voltage (power input), short circuit (speaker output), and over current
(speaker output). If the Protection LED on the front side of the amp illuminates
red, the protection circuit has engaged and the amp will not play until the problem
Gain: To accommodate the varying range of signal levels
coming from today's factory and aftermarket radios, the Kicker KX400.1 features
an adjustable gain control (low level: 125mV-5V, high level: 250mV-10V). The
rotary control is labeled from 0 to 11.
Subsonic Filter: The rotary subsonic filter control is
continuously variable from 10 Hz to 80 Hz
Crossover: The low-pass crossover point is continuously
variable from 40 Hz to 160 Hz.
KickEQ+: The KickEQ+ bass boost circuit has three controls:
- Center Frequency: continuously variable
from 20 Hz to 80 Hz
- Band Width: the Q value is variable from
1 to 5
- Boost: continuously variable from 0 to
KXRC Remote Bass Control: The KX400.1 comes with the KXRC Remote
Bass Control, which allows you to control the output level of the amplifier from the
front of your vehicle. The wired remote can be mounted under your dash. The supplied
20' cable, with RJ-25 phone plugs at each end, connects the wired remote to the
Note: The KXRC Remote Bass Control
measures approximately 1-5/8" wide x 1" high
x 1-1/4" deep (2-1/8" including knob and cable).
Power Connections: The power and ground connections are
set-screw terminals that will accommodate up to 4-gauge wire. The remote turn-on
set-screw terminal will accept up to 8-gauge wire. The included Allen-wrench is
required to loosen/tighten the terminals.
Note: The Amplifier is not equipped
with an internal fuse. An external 60-amp fuse (not
included) must be installed on the power wire. If the
system has only this amp and a wiring kit is used that
includes a fuse with a value other than 60-amps, the
original should be replaced with a 60-amp fuse.
Speaker Outputs: The Kicker KX400.1 is equipped with set-screw
terminals for one speaker. The terminals will accommodate up to 8-gauge wire and
are loosened/tightened with the included Allen-wrench.
Dual Sensitivity Inputs: The KX series amplifiers have dual
input sensitivity differential RCA inputs, which will accept either speaker-level
(high) or RCA (low) signals from your car's head unit. A high-level signal can be
run from the head unit's speaker outputs to the stereo RCA input of the amplifier
using a Speaker Wire to RCA adapter
sold separately). The Input Level Switch on the amp should be set to high when
using a speaker-level input, and low when using an RCA line-level input.
Line Level Output: The amplifier has a pair of RCA line level
outputs for feeding another amplifier. This is the same signal that is present at
the amp's inputs. Either input method (speaker-level or RCA) will provide a low-level
output signal to the RCA outputs. The amplifier's crossovers have no effect on the
line level output signal, however, if you input a filtered signal from the head unit,
the amp's low-level output will also be filtered.
Remote Bass: Connect the included wired remote bass control
to the RJ-25 port on the amplifier.