GT-X424
amplifier
G
T
-
X424
InstallatIon WarnIngs and tIps
• Disconnect the negative (–) lead from your vehicle’s battery.
• At the installation site, locate and make a note of all fuel lines,
hydraulic brake lines, vacuum lines and electrical wiring. Use
extreme caution when cutting or drilling in and around these areas.
• Choose a safe mounting location away from moisture.
• Make sure there is sufficient air circulation at the mounting location
for the amplifier to cool itself.
Owner’s Manual
• Mount the amplifier, using the supplied hardware.
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GT-X424 Car auDIO POwer aMPlIFIer Owner’s Manual
a speaker output ConneCtors
h Crossover-FrequenCy Control
• Connect the speakers to these terminals,
observing proper polarity.
• 12dB/octave crossover, variable from 32Hz to
320Hz.
• Two-channel operation: Connect the left speaker
to the L+ and L– terminals and the right speaker
to the R+ and R– terminals.
• See lfor the adjustment procedure.
i Crossover-FIlter seleCtor
• LP (SUB): Select for subwoofer(s).
• One-channel (bridged) operation: Connect the
single speaker to the R+ and L– terminals.
• FLAT: Select for full-range speakers when no
subwoofer will be used in the system.
• Minimum speaker impedance for two-channel
operation is 2 ohms. Minimum speaker impedance
for one-channel (bridged) operation is 4 ohms.
• HP: Select for midrange speakers or full-range
speakers when a subwoofer is used in the system.
b Fuse
j Bass-Boost Control
• Replace only with the same type and rating.
• Provides 6dB of boost at 50Hz. Set the Bass-
Boost control according to your preference, being
careful not to apply enough boost to damage the
speaker(s).
c poWer Input ConneCtors
• +12V: Connect to the positive terminal of the
vehicle’s battery. 10 AWG wire is recommended.
Install an appropriate fuse holder and fuse (15A
minimum) within 18" (460mm) of the battery. Make
sure the wire is not damaged or pinched during
installation. Install protective grommets when
routing wires through the firewall or other sheet
metal.
k settIng the Input level
a Turn Input-Level control counterclockwise to 6V
(minimum).
b With a dynamic music track playing, turn the
head unit’s volume control to the 3/4 position.
c Turn Input-Level control clockwise until the
music is so loud that it no longer sounds clear
(distortion is present in the output).
• GND: Connect to the vehicle’s chassis. Refer to
the picture below.
Factory Bolt
Ring Connector
d Turn Input-Level control counterclockwise
gradually, just until the music sounds clear once
again.
Ground Wire
e Input level is now adjusted correctly.
l settIng the Crossover
a Crossover setting for 5" (130mm) or larger full-
range speakers when no subwoofer is included
in the system.
Note: Remove any paint
below ring connector.
Star Washer
b Crossover setting for midrange and/or full-range
speakers when a subwoofer is included in the
system.
• REM: Connect to the “Remote Out” lead from the
source unit or to a source of switched 12V+ (ACC).
c Crossover setting for subwoofers.
d Input ConneCtors (rCa)
note: Acceptable frequency ranges are indicated in gray.
• Connect to the RCA outputs from the source unit
or signal processor.
This product is designed for mobile applications and is
not intended for connection to the mains.
e Input-level Control
A valid serial number is required for warranty coverage.
• Used to match the input level of the amplifier to the
output level of the source unit.
• See k for the adjustment procedure.
f poWer on led
• Illuminated when the amplifier is on.
g proteCt led
• Illuminated under any of the following fault
conditions: battery over/under voltage, short circuit
in speaker wires, amplifier is too hot, amplifier’s
output circuit has failed (DC voltage is present in
the amplifier’s output).
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speCIFICatIons
• 45W RMS x 2 @ 4 ohms
• 75W RMS x 2 @ 2 ohms
• 300W total max power
• THD + N: 0.05%
• Signal-to-noise ratio: 101dBA (referenced to rated power into 4 ohms)
• Frequency response: 10Hz – 100kHz (–3dB)
• Maximum input signal: 6V
• Maximum sensitivity (minimum input signal for rated output): 200mV
Declaration of Conformity
HARMAN Consumer, Inc.
8500 Balboa Boulevard, Northridge, CA 91329 USA
We, Harman Consumer Group, Inc.
2, route de Tours
© 2011 HARMAN International Industries, Incorporated.
All rights reserved.
72500 Château du Loir
France
JBL is a trademark of HARMAN International Industries,
Incorporated, registered in the United States and/or
other countries.
declare in own responsibility that the product described in this
owner’s manual is in compliance with technical standards:
EN 55013:2001+A1:2003
EN 55020:2002+A1:2003
Features, specifications and appearance are subject to
change without notice.
Klaus Lebherz
Harman Consumer Group, Inc.
Château du Loir, France 11/08
Part No. 950-0400-001
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