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
•100W RMS x 4 channels @ 4 ohms and ≤1% THD + N*
•150W RMS x 4 channels @ 2 ohms and ≤1% THD + N*
•THD + N: 0.05% (rated power @ 4 ohms)
•Signal-to-noise ratio: 85dBA
(reference 1W into 4 ohms)*
•Signal-to-noise ratio: 104dBA
(reference rated power into 4 ohms)
•Frequency response: 10Hz – 100kHz (–3dB)
•Max power: 600 watts
*CEA-2006A-compliant
0Speaker Output Connectors
•Connect the speakers to these terminals,
observing proper polarity.
•Four-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.
•Three-channel operation: Connect the stereo
speakers to the Front terminals, as above.
Connect the single speaker into which the
amplifier’srear channels will be bridged to the
Rear R+ and Rear L– terminals.
•Two-channel (bridged) operation: Connect one
speaker to the Front R+ and Front L– termi-
nals. Connect the other speaker to the Rear
R+ and Rear L– terminals.
•Minimum speaker impedance for stereo opera-
tion is 2 ohms. Minimum speaker impedance for
bridged operation is 4 ohms.
1Fuses
•Replace only with the same type and rating.
2Power Input Connectors
•+12V:Connect to the positive terminal of the
vehicle’sbattery. 8 AWG wire is recommended.
Install an appropriate fuse holder and fuse (75A
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.
•REM: Connect to the “Remote Out” lead from
the source unit or to a source of switched
12V+ (ACC).
3Aux Output Connectors (RCA)
•Summed, nonfiltered pass-through output.
Front right and rear right inputs are combined
and sent to the right AUX output. Front left
and rear left inputs are combined and sent
to the left AUX output. Connect to the input
of an additional subwoofer amplifier.
4Front Input Connectors (RCA)
•Connect to the front RCA outputs from the
source unit or signal processor.
5Front Input-Level Control
•Used to match the front input level of the
amplifier to the output level of the source unit.
•See Gfor the adjustment procedure.
6Front Crossover-Frequency Control
•12dB/octave crossover, variable from
32Hz to 320Hz.
•See Hfor the adjustment procedure.
7Front 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.
8Rear Bass-Boost Control
•Set the Bass-Boost control according to your
preference, being careful not to apply
enough boost to damage your speaker(s).
9Rear Band-Pass (BP) Switch
•If you will use the rear channels to drive a pair
of separate mid-bass speakers, place this
switch in the BP position. The front crossover
frequency control will set the low-pass filter
frequency and the rear crossover control will
set the high-pass frequency. In BP mode, the
rear crossover filter switch has no effect. Only
the front inputs should be used in BP mode.
ARear 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.
BRear Crossover-Frequency Control
•12dB/octave crossover, variable from
32Hz to 320Hz.
•See the adjustment procedure in H.
CRear Input-Level Control
•Used to match the input level of the amplifier to
the output level of the source unit. See Gfor
the adjustment procedure.
•Also used to adjust the level of the mid-bass
speakers when the BP switch is in the BP positon.
DRear Input Connectors (RCA)
•Connect to the rear RCA outputs from the
source unit, or signal processor. Not used
when the BP switch is in the BP position.
EPower On LED
•Illuminated when the amplifier is on.
FProtect 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).
GSetting Input Level
ATurn all Input-Level controls counterclockwise
to 6V (minimum).
BWith a dynamic music track playing, turn the
head unit’s volume control to the 3/4 position.
CTurn Front Input-Level control clockwise until
the music is so loud that it no longer sounds
clear (distortion is present in the output).
DTurn Front-Input-Level control counterclock-
wise gradually, just until the music sounds
clear, once again.
EFront-Level input is now adjusted correctly.
FAdjust Rear Input-Level control so that the
level of the rear speakers is proportionate to
the level of the front speakers, according to
your preference.
HSetting the Crossover
ACrossover setting for 5" or larger full-range
speakers when no subwoofer is included in
the system.
BCrossover setting for full-range speakers
when a subwoofer is included in the system.
CCrossover setting for subwoofers.
DCrossover 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.
GTO1004 CAR AUDIO POWER AMPLIFIER OWNER’S MANUAL
Factory Bolt Ring Connector
Ground Wire
Note: Remove any paint
below ring connector.
Star Washer
This product is designed for mobile applications and is not
intended for connection to the mains.
Avalid serial number is required for warranty coverage.
Features, specifications and appearance are subject to change
without notice.
GTO1004
