Boston Acoustics GT-20 GT-222 manual Head Unit, Volume, Crossover Controls

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Setup Tuning—Full-range Speakers (cont.)

4) Head Unit

The head unit should have all controls such as bass, treble, balance, and fader set to the flat or centered position. The volume control should be at the minimum setting. If the head unit has any equalization or bass management features such as boost, they should be defeated at this time. Turn head unit on, and verify that the GREEN status LED is lit on the amplifier.

5) Volume

With the chosen musical track playing, turn the head unit volume control up until the maximum level of undistorted signal is heard from the speakers. (For most head units, this will be near the end of the volume control range.)

WARNING! A distorted signal from the head unit sent to the amplifier can cause loudspeaker failure at high- er listening levels!

6) Input Sensitivity Control

Slowly rotate control clockwise until maximum undistorted playing level is heard from the speakers. Listen closely for bottoming from the speakers. If detected, rotate Input Sensitivity control counterclockwise until it is eliminated.

7) Crossover Controls

To achieve higher undistorted playing levels from the main speakers, the high- pass crossover must be engaged. Rotate crossover control fully clockwise. The highpass crossover point is now set at 350Hz. Rotate “Q” Control fully coun- terclockwise. Move crossover switch to the right (ON) position.

Slowly rotate the Input Sensitivity control clockwise until maximum undistorted playing level is heard from the speakers. Listen closely for bottoming from the speakers. If detected, rotate the input sensitivity control counterclockwise until it is eliminated. Slowly rotate the highpass crossover control counterclockwise while listening for bottoming. You are lowering the crossover point, which means that more bass signal is being sent to the speakers. If bottoming is

detected, rotate the input sensitivity control counterclockwise until it is eliminated and/or rotate the high- pass crossover control clockwise to raise the crossover point.

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Contents GT-20 GT-22 Channel, High-Current/High-Power AmplifiersTable of Contents Features and Specifications Parts ListControl Functions Lowpass Crossover Controls Status LED IndicatorsControl Mechanical Functions Amplifier Linking Wire ConnectionFuses Before You Install General Installation PrecautionsBattery & Charging System Wire RoutingChoose the Mounting Location Installation-Amplifier MountingWire Gauge Installation-Fuses & WiringPassenger & Trunk Compartment Mounting Amplifier FusesRemote Input Connection Power/B+ & Power/GND ConnectionSpeaker Output Connection Mono Subwoofer Operation Setup Tuning-Full-range SpeakersMusic Highpass & Lowpass Crossover ControlsHead Unit VolumeCrossover Controls Setup Tuning-Subwoofers Setup Tuning-Rear Fill SpeakersLowpass Crossover Control PhaseSystem A-Full-range Front Speakers System ExamplesSystem B-Rear Fill Speakers System D -Parallel 4Ω Subwoofers 2Ω load System C-Single Subwoofer 2ΩStatus LEDs on Amplifier not Lit-Head Unit Source Turned on Amplifier Troubleshooting GuideEngine Noise from Speakers Limited Warranty US Contact and Warranty InformationIf Service Seems Necessary