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9

Tuning The Amplifier - Subwoofer(s)

4) Lowpass Crossover Control

Experiment with the crossover point settings while the subwoofer is active. 
A higher setting will increase the perceived output, and a lower setting will
make the bass response more omnidirectional. Since the Lowpass cannot be 
disengaged, set to 15Hz if using an outboard processor or electronic 
crossover on the headunit. 

5) Q-Tune

Control

Once the highpass crossover point has been determined, use the Q-Tune™ control
(refer to the diagram on page 3) to increase the bass information centered around
the highpass crossover point. 

Setting the Q-Tune™ control is done in conjunction with setting the levels on the
input sensitivity and highpass crossover (subsonic) frequency controls. You may find
while setting the Q-Tune™ that over-excursion may be detected in the subwoofer (s);
lowering the Q-Tune™ input sensitivity or raising the highpass crossover point will
eliminate this. Minor adjustments to each setting are required to fine-tune the sys-
tem. 

Setting the Q-Tune™ is a subtle process. It is recommended that the Q-Tune™ set-
ting be left in the 0.7 position and adjusted only after the input sensitivity and 
highpass crossover ranges are known. Small adjustments to the Q-Tune™ setting
are all that are required to fine-tune the system.

6) GTA-RSL Subwoofer Output Control

The optional remote level control (GTA-RSL) gives you independent level adjustment
of the subwoofer’s output level beyond the standard system volume control. Please
refer to the GTA-RSL’s manual for installation instruction. The GTA-RSL is available 
separately, please consult your authorized Boston Acoustics dealer. 

Connection Diagram: 

akers - 80Hz Highpass

s 35Hz Highpass, and Q of 1.2

Summary of Contents for GTA 1105

Page 1: ...High Performance 5 Channel Amplifier GTA...

Page 2: ...x 4 N A 4 Ohm Mono 250 Watts x 2 250 Watts x 1 2 Ohm Mono N A 400 Watts x 1 Impedance Stability 2 St 4 Mono 2 Frequency Response 3dB 10Hz 50kHz 10Hz 150Hz Signal to Noise Ratio 90dB 90dB A Weighted T...

Page 3: ...0Hz cont variable GTA RSL Port Remote Gain Speaker Output Block Front and Rear Speakers Speaker Output Block Subwoofer Status LED Blue Normal Red Fault Mode Fuses Replace with same value only refer to...

Page 4: ...system Wire Routing 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...

Page 5: ...Tighten the 12v and GND terminals with the supplied 4mm hex wrench to secure the wire into the terminals If the power wire must be routed through a drilled or existing hole use a nylon panel grommet...

Page 6: ...nt to the speaker 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 con...

Page 7: ...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 clo...

Page 8: ...ad 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 Sensitivit...

Page 9: ...s You may find while setting the Q Tune that over excursion may be detected in the subwoofer s lowering the Q Tune input sensitivity or raising the highpass crossover point will eliminate this Minor a...

Page 10: ...longside power Amplifier Output Distorted Music not Recorded with Intentional Distortion Verify Source output to amplifier is not distorted Amplifier input sensitivity is correctly adjusted Amplifier...

Page 11: ...Notes 11...

Page 12: ...e is a trademark of Boston Acoustics Inc Specifications are subject to change without notice 2010 Boston Acoustics Inc All rights reserved Covered by patents issued and or pending 142 003890 0 Boston...

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