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Tuning - Subwoofers
11
Tuning The Amplifier - Subwoofer (s)
5) Lowpass Crossover Control
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. 12
o
r 24dB crossover slopes are available. Depending on your installation and listening preferences, one will
work more effectively.
6) Highpass Crossover Control
With some subwoofer applications, it may be necessary to use the highpass crossover to protect the subwoofer from
over-excursion. Move the selector switch to “ON” (refer to the diagram on page 5) The highpass should be set
to the tuning frequency (vented) or the FS of the subwoofer (sealed or freeair) If you are using a Boston
Acoustics
®
subwoofer, the correct highpass frequency and Q-Tune
™
settings for that enclosure are outlined in the
subwoofer’s owners manual.
7) Q-Tune
™
Control
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 highpass crossover point.
Setting the Q-Tune
™
control is done in conjunction with setting the levels on the input sensitivity and highpass
crossover 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 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.
8) RSL Control
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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Bridged Operation Wiring Configuration Diagram