Velodyne SPL-800i - Manual (Page 9)

www.velodyne.com SPL-800i User’s Manual - 3
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 preamp, 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 any of the LINE LEVEL, SPEAKER LEVEL, and MINI-JACK 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 120 Hz
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 120 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 P greater low frequency output. with larger speakers, you might start with this
control set lower, such as 80 Hz.
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 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 move the 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.
Crossover Switch - INTERNAL X-OVER/SUBWOOFER DIRECT
This switch allows the internal crossover circuitry to be removed from the signal path. This is required in certain
installations which route the signal through external processors with a crossover circuit of their own, such as the
new digital units. Simply move the switch to SUBWOOFER DIRECT to disengage the built-in crossover. For all
other installations which do not have a separate electronic crossover, we recommend you leave the switch set
to INTERNAL X-OVER to provide optimum performance.