GTO-3EZ - JBL Car Audio Service Manual (repair manual). Page 9

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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.
GTO-3EZ
9
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