Velodyne Acoustics SPL-1200R - Manual (Page 9)

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 “LOW-PASS CROSSOVER” on the rear panel
of the subwoofer and turn it counterclockwise to the leftmost
position. This will eliminate the internal crossover from the
signal path.
NOTE: If you are not using an external crossover, you should use
the built-in crossover for optimal performance. When using a
single RCA sub out from the processor, connect to the “L” - LFE
input in the subwoofer.
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 quality speaker
cable that mates well with the connectors (at least 14-gauge). Be
very careful to avoid any loose or frayed strands that could result
in a short, causing a dangerous condition and possible damage
to your unit. Cables of extremely large size are typically not
required. Extremely large gauge wire may not properly fit in the
binding posts, resulting in a poor connection and possible
short circuits.
Placement
True subwoofers operate at extremely low frequencies which are
primarily omni-directional. While it is recommended that the
subwoofer be placed on the same plane as the satellite
speakers, room and system conditions often dictate otherwise.
Keep in mind that frequency response and output level can be
drastically influenced by placement, depending on the acoustic
properties of the listening room. Typically, the optimum location
for a subwoofer is in a front corner of your listening room. This
location will usually offer the greatest output levels and optimum
low frequency extension. The worst location for a subwoofer is
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