American Acoustic Development C Series-3G - Manual (Page 10)

Power switch on/off
Upper position: Power on
Lower position: Power off
Middle position: Auto on
At this position the subwoofer amplifier is in a stand by mode, awaiting an input
signal. When there is no signal, the amplifier is shut down. As soon as the signal
appears, the amplifier switches on. If signal is absent, the amplifier will shut
down automatically after a pre-determined period of time. The power indicator
is red when the switch is at OFF position, and green when the switch is at ON
or AUTO position.
Volume Control
Use this control to balance the level of the woofer with the level of your main
speakers.
Crossover Frequency control
If you are using small loudspeakers (4”to 6” woofers) in your main system, you
will need to set the crossover frequency at a high position (100 to 160 Hz). If
your main speakers have larger woofers (8” and above) you will need to set the
crossover frequency to much lower position (40 to 80 Hz). Generally, the larger
the speaker, the greater the low frequency output will be. If the frequency
control is set too high, the bass will appear “boomy” due to outputs of
subwoofer and main speakers overlapping each other. If it is set too low, the
bass will be ill defined and the subwoofer will sound detached from the rest of
the system.
Phase Control
Use this control to determine the best possible bass performance of your system.
There can be interference between your main speakers and subwoofer at the
frequency where they cross over due to placement, room acoustics and type of
main speakers used. By carefully positioning the subwoofer in the room in
combination with the level and crossover control, you should be able to get a
seamless transition between your main speakers and subwoofer. Start with the
full anticlockwise 0 position. This means that the subwoofer will push out
positive pressure wave corresponding to a positive electrical input. The
180 full clockwise position inverts this so the subwoofer will put out a negative
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