JBL GX-A602, GX-A3001 owner manual Problem Causes and Solutions

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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.

•(GX-A604): Check that the setting of the amplifier’s Mode Switch matches the input and speaker connections made to the amplifier

Sound is too quiet, even with the vehicle audio	• Check that the amplifier’s Level controls are not turned too low. See Set The Input Level, on
system’s source unit volume all the way up	page 22, for information about setting the Level controls.
Sound in the front/rear speakers is distorted	• Make sure the amplifier’s Crossover Filter switch for the distorted channels is set to HP.
	• Set the Crossover control for the distorted channels 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	• (GX-A604, GX-A602): Set the Bass Boost switch to "OFF".
	• (GX-A3001): 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.

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