Boston Acoustics GTA 1105, Installation Manual

Page: 8 / 12

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8
Tuning The Amplifier - Subwoofer(s)
1) 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 deactivated at this time. Turn head unit
on, and verify that the Blue status LED (logo) is illuminated on the amplifier.
2) 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 at the end of the volume control range.
WARNING! A distorted signal from the head unit sent to the amplifier can
cause speaker failure at higher listening levels.
3) Input Sensitivity Control (Gain)
Turn control (refer to the diagram on page 3) all the way counterclockwise
(minimum position). In this position, the amplifier will be less sensitive to the
input signal from the head unit. Slowly rotate this control clockwise until
maximum undistorted playing level is heard from the subwoofer(s). Listen
closely for faults such as bottoming from the subwoofer(s). If fault is detected,
rotate input sensitivity control counterclockwise until fault is eliminated. At this
point, the maximum undistorted subwoofer playing level has been defined.
Configuration and Connection Diagram:
Front & Rear Speakers - 80Hz Highpass
Subwoofer - 80Hz Lowpass, 35Hz Highpass, and Q of 1.2