Harman GTO-5EZ, GTO-3EZ owner manual Problem, Causes and solutions, Sound only comes from some of

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Problem	Causes and solutions
Sound only comes from some of	• Check that the settings of the amplifier’s Input Routing switches match the
the speakers connected to the	input and speaker connections made to the amplifier.
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	• Check the amplifier’s Input Level switches. If they are set to “Hi1,” turn the
vehicle audio system’s head unit	amplifier’s Gain controls all the way down and re-set the Input Level switches
volume turned all the way up:	to “Low.” Then perform the Set the Gain procedure, on page 9, again.
Sound in the front/rear speakers	• If the amplifier channels’ Input Level switch is set in the “Low” position, change
is distorted:	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	• If the amplifier Sub channel’s Input Level switch is set in the “Low” position,
distorted:	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	• Make sure that the amplifier’s Front/Rear Input Routing switch is set in the
system’s source unit’s fader	“F&R” position.
control has no effect:

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.

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