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8
seTuP PrOcedure
GTO series amplifiers include a setup CD with test signals that makes it easy to precisely set the amplifier’s input gain
to maximize the amplifier’s signal-to-noise and dynamic range performance with your vehicle’s audio system. The
amplifiers feature three Gain Indicator LEDs that provide all the feedback you need to quickly set the gain to the proper
level.
CONTROLS
Before setting the amplifier controls: Confirm that all connections have been correctly made, reconnect the
vehicle’s negative (–) battery terminal and turn the audio system on.
Crossover
Control
Bass
Boost
Control
Crossover
Filter
Selector
Crossover
Filter
Selector
Gain
Indicator
LEDs
Sub Channel Controls Front Channel Controls Rear Channel Controls
(GTO-5EZ only)
Gain
Indicator
LEDs
Gain
Indicator
LEDs
Crossover
Control
Gain
Control
Gain
Control
Gain
Control
Crossover
Control
SET THE CROSSOVER
Before you set the amplifier’s gain, we recommend that you set the Crossover controls for the speakers that you have
connected to each of the amplifier’s channels.
Crossover Filter Selector
The Crossover Filter Selector lets you configure the front (and rear – GTO-5EZ) channels for either high-pass, low-pass
or full-range operation. The Sub channel crossover is permanently set for low-pass operation.
• If you have connected a subwoofer or woofer to the amplifier channels: Set the Crossover Filter selector in
the “LP” (low-pass) position. This will limit the amount of high-frequency energy sent to the woofers or subwoofer.
• If you have connected any other type of speaker to the amplifier channels: Set the Crossover Filter selector
in the “HP” (high-pass) position. This will limit the amount of low-frequency energy sent to the speaker, significantly
reducing distortion and preventing the speaker from damage. Exception: If you have connected large full-range
speakers (6" x 9" or larger) that can handle significant bass to the amplifier channels and you are not using a
subwoofer in the system, set the Crossover Filter selector for full-range operation (the switch’s center position).
Crossover Control
The Crossover control determines the frequency where the low frequencies or high frequencies sent to the speakers
begin to be reduced in volume.
• High-pass operation: For high-pass filters, you should set the Crossover control according to the size of the
speakers connected to the amplifier channels – the smaller the speakers the higher you need to set the control to
protect the speaker from damage. The illustration below shows the acceptable crossover filter frequency ranges
for different speaker sizes.
6-Inch and 5-Inch
Speakers
4-Inch and Smaller
Speakers
After initially setting the crossover frequency, listen to music with strong bass that you are familiar with. If the speakers
sound distorted or distressed, move the crossover frequency control to a higher setting to eliminate the distortion/
distress.