Velodyne Acoustics SPL-800 - Manual (Page 8)

Installation
Inputs
Your new subwoofer is equipped with speaker-level and line-level inputs.
Use the LINE LEVEL jacks when connecting your subwoofer to a pre-amp,
signal processor, line-level crossover, or receiver with pre-amp level
outputs. The SPEAKER LEVEL jacks connect directly to the speaker
outputs of any amplifier, integrated amplifier, or receiver. Your amplifier
section will notice no additional loading effects when you use these inputs
due to their very high impedance.
Important!!!
Do not use both LINE LEVEL and SPEAKER LEVEL connections
simultaneously!
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 level from both the main speakers and subwoofer
when listening to music. A good starting point for the volume control is
3 or 4 dots from minimum.
Low-pass crossover - 40 to 120Hz
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 40 to 120Hz. 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.
A bypass switch is also provided if you wish to use an external crossover.
If you are not using an external crossover, we recommend that you use
the one provided within the unit for optimum performance!
Phase adjustment - 0°/180°
This control allows you the "reverse" the phase of the subwoofer's output
signal 180° to correct for any possible mismatch and resulting cancellation
continued. . .
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