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Configuration and Connection Diagram:
GTA-504 Amplifier Powering Both Front Speakers and a Subwoofer
80Hz Highpass Front, 65Hz Lowpass Rear w/ Q-Tune
Tuning The Amplifier - Front Speakers and 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 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.
4) Front Crossover Control
To achieve higher undistorted playing levels from the main speakers, the highpass
crossover must be engaged. Rotate the crossover control fully clockwise (refer to
the diagram on page 3). The highpass crossover point is now set at 200Hz. Q-Tune
should be set to off.