11
www.jbl.com
E
ng
lis
h
prOBlem
causes and sOluTiOns
Sound only comes from some of
the speakers connected to the
amplifier:
• Check that the settings of the amplifier’s Input Routing switches match the
input and speaker connections made to the amplifier.
• Check that the vehicle audio system’s source unit’s balance and fader controls
are set to their center (midpoint) positions.
• If the subwoofer is silent and the optional Remote Bass Control is
connected to the amplifier, check that it is not turned all the way down (fully
counterclockwise).
Sound is too quiet, even with the
vehicle audio system’s head unit
volume turned all the way up:
• Check the amplifier’s Input Level switches. If they are set to “Hi1,” turn the
amplifier’s Gain controls all the way down and re-set the Input Level switches
to “Low.” Then perform the
Set the Gain
procedure, on page 9, again.
Sound in the front/rear speakers
is distorted:
• If the amplifier channels’ Input Level switch is set in the “Low” position, change
the setting to “Hi1” and perform the
Set the Gain
procedure, on page 9, again
for those channels.
• Make sure amplifier’s Crossover Filter selector for the distorted channels is set
to HP.
• Set the distorted channels’ Crossover control to a higher setting.
• Check that the distortion is not originating from the vehicle audio system’s
source unit.
Sound in the subwoofer is
distorted:
• If the amplifier Sub channel’s Input Level switch is set in the “Low” position,
change the setting to “Hi1” and perform the
Set the Gain
procedure, on page
9, again for those channels.
• While listening to bass-heavy music, turn the Bass Boost control all the way
down, and then gradually increase it until the distortion begins to return.
Reduce the Bass Boost control setting slightly to eliminate the distortion and
leave it set there.
• Check that the distortion is not originating from the vehicle audio system’s
source unit.
GTO-5EZ only: The vehicle audio
system’s source unit’s fader
control has no effect:
• Make sure that the amplifier’s Front/Rear Input Routing switch is set in the
“F&R” position.
The vehicle audio system’s
subwoofer volume control does
not control the subwoofer’s
volume:
• Make sure that the amplifier’s Sub Input Routing switch is set in the “S”
position.
The amplifier’s Gain LEDs
constantly illuminate red while
the amplifier is operating:
• Set the amplifier’s Gain LEDs switch in the “Off” position.
