Boston Acoustics GT-475, GT-4100 owner manual Tune Control Front Channel Only, Rear Input Switch

Tuning The Amplifier - Front Speakers and Subwoofer (s)

Highpass Crossover Control (Front Channel Only) Cont.

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.

6) Q-Tune™ Control (Front Channel Only)

Once the highpass crossover point has been determined, use the Q-Tune™ control (refer to the diagram on page 5) to increase the bass information centered around the crossover point.

Setting the Q-Tune™ control is done in conjunction with setting the levels on the input sensitivity and high- pass crossover frequency controls. You may find while setting the Q-Tune™ that over-excursion may be detected in the front speakers; 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 system.

Setting the Q-Tune™ is a subtle process. It is recommended that the Q-Tune™ setting 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.

7) Rear Input Switch

For dual RCA Input, set switch to STEREO. If one RCA is used, move switch to the right-hand (MONO) position (refer to the diagram on page 5)

8) Lowpass Crossover Control (Rear Channels Only)

Move the selector switch to “ON” (refer to the diagram on page 5). 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 setting will make the bass response more omnidirectional.

9) RSL Control (Rear Channels Only)

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

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3 Channel Operation Wiring Configuration Diagram

Tuning - Subwoofers

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