Harman JBL GX-A422SI, Service Manual

Page: 14 / 31

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PROBLEM CAUSES AND SOLUTIONS
Sound only comes from some of the speakers
connected to the amplifier
• Check that the vehicle audio system's source unit's balance and fader controls are set to their
center (midpoint) positions.
Sound is too quiet, even with the vehicle audio
system's source unit volume all the way up
• Check that the amplifier's Level controls are not turned too low. See Set The Input Level, on
page 11, for information about setting the Level controls.
Sound in the subwoofer is distorted • Set the Bass Boost switch to "OFF."
• Check that the distortion is not originating from the vehicle audio system's source unit.