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3
Status LED
The Boston Logo will illuminate “Blue” under normal operating conditions.
The LED will illuminate “Red” during start-up and under fault conditions. If the
LED is still red after start-up, please refer to troubleshooting on page 8.
Speaker Level Input
RCA Input (Left and Right)
Gain (250mv to 5.0v - continuously variable)
Q-T
une
™
“Q” Adjustment (0.707 to 1.6 - cont. variable)
Lowpass Crossover Adjustment (50Hz to 150Hz - cont. variable)
Q-Tune
™
Highpass (Subsonic) Adjustment (10Hz to 50Hz - cont. variable)
GTA-RSL Port (Remote Gain)
Speaker Output Block
Status LED (Blue = Normal / Red = Fault Mode)
Fuse (Replace with same value only, refer to specifications on page 2)
Power Block (12v / Remote / Ground)
1
3
14 15
3
5
1
4
8
9
1
0
1
1
7
2
6
3
5
1
4
8
9
10
11
7
2
6
GTA-400m
GTA-800m
Connections and Controls
Speaker Level Input Cable
GTA amplifiers offer a dedicated speaker level input for ease installation into
factory systems when an RCA (low level) signal is not available. Wiring code for
the cable is industry standard;
White Solid = Left Positive White w/ Black Stripe = Left Negative
Gray Solid = Right Positive Gray w/ Black Stripe = Right Negative
Warning: Do not connect both Speaker Level and RCAs into the amplifier at the
same time as damage to the amplifier may occur.