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GTO5355 CAR AUDIO POWER AMPLIFIER OWNER'S MANUAL
Installation Warnings and Tips
• Disconnect the negative (–) lead from your vehicle's
battery.
• At the installation sites, 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.
• Mount the amplifier, using the supplied hardware.
Specifications
• 55W RMS x 4 channels, plus 225W RMS
x 1 channel, @ 4 ohms and ≤1% THD + N*
• 75W RMS x 4 channels, plus 360W RMS
x 1 channel, @ 2 ohms and ≤1% THD + N*
• THD + N: 0.03% (rated power @ 4 ohms)
• Signal-to-noise ratio: 85dB
(reference 1W into 4 ohms)*
• Signal-to-noise ratio: 104dB
(reference rated power into 4 ohms)
• Frequency response: 10Hz – 83kHz and
20Hz – 250Hz
• Max power: 660 watts
* CEA-2006A-compliant
Speaker Output Connectors
• Connect the speakers to these terminals,
observing proper polarity.
• Five-channel operation: Connect the front left
speaker to the Front L+ and L– terminals and
the front right speaker to the Front R+ and
R– terminals. Repeat for the rear speakers,
using the Rear L+ and L– terminals, and
the Rear R+ and R– terminals. Connect the
subwoofer to the Sub+ and Sub– terminals.
• Four-channel operation: Connect the stereo
speakers to the Front terminals, as above.
Connect the single speaker into which the
amplifier's rear channels will be bridged to the
Rear R+ and Rear L– terminals. Connect the
subwoofer to the Sub+ and Sub– terminals
• Three-channel (bridged) operation: Connect
one speaker to the Front R+ and Front L–
terminals. Connect the other speaker to the
Rear R+ and Rear L– terminals. Connect the
subwoofer to the Sub+ and Sub– terminals.
• Minimum speaker impedance for stereo
operation is 2 ohms. Minimum speaker
impedance for bridged operation is 4 ohms.
Minimum subwoofer impedance is 2 ohms.
Fuses
• Replace only with same type and rating.
Power Input Connectors
• +12V: Connect to the positive terminal of the
vehicle's battery. 4 AWG wire is recommended.
Install an appropriate fuse holder and fuse
(80A minimum) within 18 inches 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.
• GND: Connect to the vehicle's chassis. Refer to
the picture below.
Factory Bolt
Ring Connector
Ground Wire
Note: Remove any paint
Star Washer
below ring connector.
• REM: Connect to the "Remote Out" lead from
the source unit or to a source of switched
12V+ (ACC).
Front Input Connectors (RCA)
• Connect to the front RCA outputs from the
source unit or signal processor.
Front Input-Level Control
• Used to match the front input level of the
amplifier to the output level of the source unit.
• See
for the adjustment procedure.
Front Crossover-Frequency Control
• 12dB/octave crossover, variable from
32Hz to 320Hz.
• See
for the adjustment procedure.
Front Crossover-Filter Selector
• LPF: Select for subwoofer(s).
• Flat: Select for full-range speakers when
no subwoofer will be used in the system.
• HPF: Select for midrange speakers or
full-range speakers when a subwoofer is
used in the system.
Power On LED
• Illuminated when the amplifier is on.
Subwoofer Input Connector (RCA)
• Connect to the subwoofer RCA outputs from
the source unit, or signal processor.
Rear Crossover-Filter Selector
• LPF: Select for subwoofer(s).
• Flat: Select for full-range speakers when
no subwoofer will be used in the system.
• HPF: Select for midrange speakers or
full-range speakers when a subwoofer is
used in the system.
Rear Crossover-Frequency Control
• 12dB/octave crossover, variable from
32Hz to 320Hz.
• See the adjustment procedure in
Rear Input-Level Control
• Used to match the rear input of the amplifier to
the output of the source unit.
• See
for adjustment procedures.
Rear Input Connectors (RCA)
• Connect to rear RCA outputs from the source
unit, or signal processor.
EXT/INT Switch
• If the source unit has a subwoofer output and
you have connected it to the SUB input, set this
switch to the EXT position. Otherwise, set it in
the INT position.
Optional Remote Level Control (RLC) Connector
• Connect the Remote Level Control (RLC) here,
using the RJ-11 cable (supplied with the RLC).
Subwoofer Level Control
• Used to match the SUB input of the amplifier to
the output of the source unit.
• See
for adjustment procedures.
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
present in the amplifier's output).
Subwoofer Low-Pass Filter Frequency Control
• 12dB/octave low-pass filter, variable from 20Hz
to 200Hz.
• See the adjustment procedure in
DBO (Dynamic Bass Optimization)
Variable Subsonic High-Pass Filter With
Variable Boost (Q)
• For woofers in tuned (vented) enclosures, set
the Frequency control to a value 10Hz below the
enclosure's resonance (tuned) frequency.
• For woofers in sealed boxes, set the control to
any value you prefer between 30Hz and 50Hz.
• Set the Boost control according to your
preference, being careful not to apply
enough boost to damage your woofer(s).
A DBO High-Pass Filter Frequency control,
variable between 20Hz and 100Hz.
See above for appropriate settings.
B DBO Boost control provides up to
12dB of boost, slightly above the high-
pass filter's frequency. See above for
appropriate settings.
Setting Input Level
A Turn all Input-Level controls 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 Front Input-Level control clockwise until
the music is so loud that it no longer sounds
clear (distortion is present in the output).
D Turn Front-Input-Level control counterclock-
wise gradually, just until the music sounds
clear, once again.
E Front-Level input is now adjusted correctly.
F Adjust the Rear and Sub Input-Level controls
so that the level of the rear speakers and the
level of the subwoofer are proportionate to the
level of the front speakers, according to your
preference.
Setting the Crossover
A Crossover setting for 5" or larger full-range
speakers when no subwoofer is included in
the system.
B Crossover setting for full-range speakers
.
when a subwoofer is included in the system.
C Crossover setting for subwoofers.
D Crossover setting for systems that include
separate mid-bass speakers driven by the rear
channels, with the BP switch set to "BP."
Note: Acceptable frequency ranges are indicated
in gray.
Remote Level Control (Optional)
The Remote Level Control, if installed, will allow
you to adjust the level of bass while seated in the
listening position.
This product is designed for mobile applications and is not
intended for connection to the mains.
A valid serial number is required for warranty coverage.
Features, specifications and appearance are subject to change
without notice.
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