Boston GTA-502 Manual Download Page 7

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7

Tuning The Amplifier - Front or Rear Speakers

WARNING!

A distorted signal from the head unit sent to the amplifier can cause

loudspeaker failure at higher listening levels.

6) Input Sensitivity Control (Gain)

Slowly rotate the control clockwise (refer to the diagram on page 3) 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. 

7) Crossover Controls

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. 

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
Highpass crossover control clockwise to raise the crossover point.

8) Q-Tune

Control 

Q-Tune allows for +6dB boost of bass information centered at 45Hz and is not
typically needed for full range speaker applications. 

Connection Diagram: 

ir of Full Range Speakers (80Hz Highpass)

fuse

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Summary of Contents for GTA-502

Page 1: ...High Performance Two and Four Channel Amplifiers GTA Downloaded from http nothickmanuals info...

Page 2: ...10Hz 50kHz 10Hz 50kHz 10Hz 50kHz Signal to Noise Ratio 90dB 90dB 90dB A Weighted THD N 0 05 0 05 0 05 Highpass Crossover Frequency Range 50Hz 200Hz 50Hz 200Hz 50Hz 200Hz Slope dB Per Octave 12dB 12dB...

Page 3: ...tatus LED Blue Normal Red Fault Mode Fuse Replace with same value only refer to specifications on page 2 Power Block 12v Remote Ground 13 14 15 3 5 1 4 8 9 10 11 7 2 6 3 5 1 4 8 9 10 11 7 2 6 3 5 1 4...

Page 4: ...Do not run the power wire near any low level signals or audio cables such as the RCAs from the head unit Noise can be introduced into the amplifier when this occurs It is helpful to diagram the wire...

Page 5: ...the power wire must be routed through a drilled or existing hole use a nylon panel grommet to prevent the insulation from fraying Failure to do so could lead to an electrical short if the wire insulat...

Page 6: ...peaker outputs If over excursion is detected from speakers move the switch to HP and slowly rotate clockwise until over excursion is eliminated 4 Head Unit The head unit should have all controls such...

Page 7: ...ver point is now set at 200Hz Q Tune should be set to off Slowly rotate the input sensitivity control clockwise until maximum undistorted playing level is heard from the speakers Listen closely for bo...

Page 8: ...ts 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 Cont...

Page 9: ...may choose to use Q Tune to increase the bass information Q Tune will offer a 6dB bass boost centered at 45Hz which can be beneficial if more low bass output is desired To engage Q Tune move the sele...

Page 10: ...d 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 counterc...

Page 11: ...In this setting lowpass signal is sent to the speaker outputs Experiment with the crossover point settings while the subwoofer is active A higher setting will increase the perceived output and a lower...

Page 12: ...Thermal Protection Mode Verify Amplifier is mounted with adequate space around heatsink Amplifier is not mounted under carpet Speakers meet correct impedance for application mono or stereo hookup Amp...

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