Velodyne Acoustics VRP-1000 - Manual (Page 6)

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Caution!!! To avoid damage to your main amplifier, be sure to maintain
correct polarity when making all connections - red (positive) to red,
and black (negative) to black. Be sure all connections are tight, and
that there are no loose strands or frayed wires.
Volume Control
This control allows you to balance the output from the subwoofer to
the main speakers/amplifier in your system. This control should be
set to achieve similar output levels from both the main speakers
and subwoofer when listening to music. A good starting point for
the volume control is 2 or 3 graduations from minimum.
Low-pass Crossover - 50 to 200 Hz
As noted above, 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 200 Hz. 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 100-120 Hz) 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 80 Hz.
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.