Velodyne Acoustics SPL-800 - Manual (Page 13)

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To bypass the subwoofer's internal crossover when the unit is being fed
a low pass signal from another crossover, simply locate the switch marked
INTERNAL X-OVER/SUBWOOFER DIRECT on the rear panel of the
subwoofer and set to the SUBWOOFER DIRECT position. This will
eliminate the internal crossover from the signal path.
Speaker-level Connection
Figure 3 shows an easy way to connect your Velodyne subwoofer directly
to your receiver or integrated amplifier, if it lacks line-level outputs. You
may also connect your satellites directly to your receiver or amplifier along
with the subwoofer. Your receiver or amplifier will not notice the additional
load of the suboofer due to the high input impedance.
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 that all connections are tight, and that
there are no loose strands or frayed wires.
Interconnect Cables
When installing your new Velodyne subwoofer using the line level
connections, you should always use shielded phono cables. There are
many decent cables available today, most any of which will work perfectly
well. We do recommend that you keep the length of cable as short as
possible to avoid any potential noise problems.
When using speaker level connections, use a decent quality speaker cable
that mates well with the connectors. Be very careful to avoid any loose
The Velodyne subwoofer is designed to operate using the full range audio
signal for input when using the built-in crossover. Many home theater
processors/receivers (Dolby Digital, DTS, THX) have a "subwoofer out"
jack that is internally filtered and designed to be used with a powered
subwoofer. In these installations, you may bypass the internal crossover
in either the processor or the Velodyne subwoofer. In some installations,
it may be beneficial to have a steeper ultimate crossover slope. To do this,
you can use both your processor's crossover and the one internal to the
Velodyne sub. You should stagger the frequencies, (i.e., 120Hz sub, 80Hz
processor) for best results.
Subwoofer Outputs