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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
• 225W RMS x 1 channel @ 4 ohms and
<
1% THD + N*
• 360W RMS x 1 channel @ 2 ohms, 14.4V supply and
<
1% THD + N*
• Frequency response: 20Hz – 330Hz (–3dB)
• Maximum input signal: 6V*
• Maximum sensitivity: 100mV*
• THD + N: 0.04%
• Signal-to-noise ratio: 85dBA
(reference 1W into 4 ohms)*
• Signal-to-noise ratio: 104dBA
(reference rated power into 4 ohms)
* CEA-2006A-compliant
Speaker Output Connectors
• Connect the subwoofer to these terminals,
observing proper polarity
. Either + or –
terminal may be used. Minimum total
impedance is 2 ohms.
Fuses
• Replace only with the same type and rating.
Power Input Connectors
• +12V: Connect to the positive terminal of the
vehicle’s battery. 8 AWG wire is recommended.
Install an appropriate fuse holder and fuse (60A
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).
Aux Output Connectors (RCA)
• Nonfiltered pass-through output. Connect to the
input of an additional amplifier.
Input Connectors (RCA)
• Connect to the RCA outputs from the source unit
or signal processor.
Input-Level Control
• Used to match the input level of the amplifier
to the output level of the source unit.
• See
for the adjustment procedure.
Low-Pass Filter Frequency Control
• 12dB/octave low-pass filter,
variable from 32Hz to 320Hz.
• See
for the adjustment procedure.
DBO (Dynamic Bass Optimization) Variable
Subsonic High-Pass Filter With V
ariable 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 10Hz 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.
Optional Remote Level Control (RLC) Connector
• Connect the Remote Level Control (RLC) here,
using the RJ-11 cable (Supplied with the RLC).
Power On LED
• Illuminated when the amplifier is on.
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).
Setting Input Level
A Turn Input Level control counterclockwise to
6V (minimim).
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
bass output is proportionate to the output of
the high-frequency speakers, according to
your preference.
D Input level is now adjusted correctly.
Setting the Crossover
A Crossover setting for subwoofers.
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.
GTO3501 CAR AUDIO SUBWOOFER 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.
A valid serial number is required for warranty coverage.
Features, specifications and appearance are subject to change
without notice.