Harman GTO-3EZ, GTO-5EZ Setup Procedure, Controls, Set the Crossover, Crossover Filter Selector

Setup Procedure

GTO series amplifiers include a setup CD with test signals that makes it easy to precisely set the amplifier’s input gain to maximize the amplifier’s signal-to-noise and dynamic range performance with your vehicle’s audio system. The amplifiers feature three Gain Indicator LEDs that provide all the feedback you need to quickly set the gain to the proper level.

Controls

Before setting the amplifier controls: Confirm that all connections have been correctly made, reconnect the vehicle’s negative (–) battery terminal and turn the audio system on.

Crossover

Gain

Crossover

Gain

Crossover

Gain

Control

Control

Control

Control

Control

Control

Gain

Bass

Crossover

Gain

Crossover

Gain

Indicator

Boost

Filter

Indicator

Filter

Indicator

LEDs

Control

Selector

LEDs

Selector

LEDs

Sub Channel Controls	Front Channel Controls	Rear Channel Controls
		(GTO-5EZ only)

Set the Crossover

Before you set the amplifier’s gain, we recommend that you set the Crossover controls for the speakers that you have connected to each of the amplifier’s channels.

Crossover Filter Selector

The Crossover Filter Selector lets you configure the front (and rear – GTO-5EZ) channels for either high-pass, low-pass or full-range operation. The Sub channel crossover is permanently set for low-pass operation.

•If you have connected a subwoofer or woofer to the amplifier channels: Set the Crossover Filter selector in the “LP” (low-pass) position. This will limit the amount of high-frequency energy sent to the woofers or subwoofer.

•If you have connected any other type of speaker to the amplifier channels: Set the Crossover Filter selector in the “HP” (high-pass) position. This will limit the amount of low-frequency energy sent to the speaker, significantly reducing distortion and preventing the speaker from damage. Exception: If you have connected large full-range speakers (6" x 9" or larger) that can handle significant bass to the amplifier channels and you are not using a subwoofer in the system, set the Crossover Filter selector for full-range operation (the switch’s center position).

Crossover Control

The Crossover control determines the frequency where the low frequencies or high frequencies sent to the speakers begin to be reduced in volume.

•High-pass operation: For high-pass filters, you should set the Crossover control according to the size of the speakers connected to the amplifier channels – the smaller the speakers the higher you need to set the control to protect the speaker from damage. The illustration below shows the acceptable crossover filter frequency ranges for different speaker sizes.

6-Inch and 5-Inch	4-Inch and Smaller
Speakers	Speakers

After initially setting the crossover frequency, listen to music with strong bass that you are familiar with. If the speakers sound distorted or distressed, move the crossover frequency control to a higher setting to eliminate the distortion/ distress.

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