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
•75W RMS x 2 channels @ 4 ohms and ≤1% THD + N*
•110W RMS x 2 channels @ 2 ohms and ≤1% THD + N*
•THD + N: 0.07% (rated power @ 4 ohms)
•Signal-to-noise ratio: 90dBA
(reference 1W into 4 ohms)*
•Signal-to-noise ratio: 108dBA
(reference rated power into 4 ohms)
•Frequency response: 10Hz – 100kHz (–3dB)
•Max power: 220 watts
*CEA-2006A-compliant
0Speaker Output Connectors
•Connect the speakers to these terminals,
observing proper polarity.
•Two-channel operation: Connect the left
speaker to the L+ and L– terminals and the
right speaker to the R+ and R– terminals.
•One-channel (bridged) operation: Connect the
single speaker to the R+ and L– terminals.
•Minimum speaker impedance for 2-channel
operation is 2 ohms. Minimum speaker impedance
for 1-channel (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’s battery. 10 AWG wire is recommended.
Install an appropriate fuse holder and fuse (30A
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)
•Nonfiltered pass-through output. Connect
to the input of an additional amplifier.
4Input Connectors (RCA)
•Connect to the RCA outputs from the source unit
or signal processor.
5Input-Level Control
•Used to match the input level of the amplifier
to the output level of the source unit.
•See Bfor the adjustment procedure.
6Front Crossover-Frequency Control
•12dB/octave crossover, variable from
32Hz to 320Hz.
•See Cfor the adjustment procedure.
7Crossover-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.
8Bass-Boost Control
•Set the Bass-Boost control according to your
preference, being careful not to apply
enough boost to damage your speaker(s).
9Power On LED
•Illuminated when the amplifier is on.
AProtect 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).
BSetting Input Level
ATurn Input-Level control counterclockwise to
6V (minimum).
BWith a dynamic music track playing, turn the
head unit’s volume control to the 3/4 position.
CTurn Input-Level control clockwise until the
music is so loud that it no longer sounds clear
(distortion is present in the output).
DTurn Input-Level control counterclockwise
gradually, just until the music sounds clear,
once again.
EInput level is now adjusted correctly.
CSetting the Crossover
ACrossover setting for 5" or larger full-range
speakers when no subwoofer is included in
the system.
BCrossover setting for midrange and/or
full-range speakers when a subwoofer
is included in the system.
CCrossover setting for subwoofers.
Note: Acceptable frequency ranges are indicated
in gray.
GTO752 CAR AUDIO POWER AMPLIFIER OWNER’S MANUAL
