Velodyne VX-10 - Manual (Page 8)

Low-pass crossover - 50 to 200Hz
All inputs sum the left and right channels together, with the resulting signal
passing through an adjustable low-pass crossover before being amplified.
The crossover control allows you to adjust the upper limit of the subwoofer's
frequency response from 50 to 200Hz. The subwoofer's response will begin
rolling off above the frequency you set this control to. You should set the
crossover frequency to obtain a smooth and seamless transition from the
subwoofer to the main speakers in your system. If your main speakers are
smaller units with limited low frequency output, you may wish to choose
a higher frequency (such as 100-120Hz) than you would with larger
speakers which have greater low frequency output. With larger speakers,
you might start with this control set lower, such as 80Hz.
Phase adjustment - 0°/180°
This control allows you to "reverse" the phase of the subwoofer's output
signal 180° to correct for any possible mismatch and resulting cancellation
between the subwoofer and your main speakers/amplifier. To adjust,
simply listen to the system with music playing, then depress the phase
switch from one position to the other and listen for a change in low
frequency output. The correct position will have a greater amount of
apparent low frequency output.
Auto turn on function
The subwoofer will turn itself on automatically when an audio signal is
present. If no signal is present for approximately 8 minutes, the unit will
switch to standby mode (Red LED). While in standby mode, your subwoofer
will draw very minimal power.
Power switch (230V models only)
The master power switch is located on the lower half of the unit. This rocker
style switch is the main on/off for the unit. This switch should be set to
position 1 (up) for "ON" and 0 (down) for "OFF".
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Subwoofer outputs
The Velodyne subwoofer is designed to operate using the full range audio
signal for input when using the built-in crossover. Some processors/
receivers, have a "subwoofer out" jack that is internally filtered and
designed to be used with a conventional amplifier and speaker. In some
rare cases, combining both an external crossover and the one internal to
the subwoofer may result in low output and increased noise. In these
installations you may need to bypass the internal crossover in either the
processor or Velodyne subwoofer. In some installations, simply setting
one crossover to a higher frequency (such as 120 Hz) will restore maximum
performance.
Figure 2b. Speaker-level subwoofer connection diagram.