Velodyne SPL-1200 - Manual (Page 7)

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location will usually offer the greatest output levels and optimum low
frequency extension. The worst location for a subwoofer is typically far
away from any walls, and close to the center of your room. Avoid these
locations when possible. When using a pair of Velodyne subwoofers in
stereo, it is preferable to place each subwoofer by the satellite of the same
channel.
Caution! This subwoofer has electronics built into the cabinet. Do not
place the cabinet next to sources of heat such as furnace registers,
radiators, etc. Do not place the unit near sources of excessive moisture,
such as evaporative coolers, humidifiers, etc. The power cord should be
routed in such a way that it will not be walked on, pinched, or compressed
in any way that could result in damaging the insulation or wire.
Regardless of where you install your Velodyne subwoofer, it must remain
in an upright position (woofer facing forward). Using, shipping, or
otherwise storing the subwoofer in any other position for an extended
period of time may result in damage to the unit not covered by warranty.
The SPL-1000 and SPL-1200 are magnetically shielded to reduce the
amount of stray magnetic energy emitted from the speaker's motor structure.
This greatly increases flexibility when placing the unit close to video
monitors as there is very little stray magnetism. Certain types of televisions
are particularly sensitive to stray magnetic fields. If your television
produces distorted colors after installing your subwoofer, simply increase
the distance between your television and the subwoofer, until normal color
and operation is returned.
Your new Velodyne subwoofer, like any good speaker system, requires
proper positioning within the listening space to provide maximum
performance. Improperly placed speakers may degrade the sound quality
and reduce your listening pleasure. Depending on the size and type of
furnishings in the room, perfect placement may not be possible. Finding
the best location for your environment will likely require some
experimentation. We suggest you experiment with the location during
setup to find what sounds best to you when seated in your typical listening
position.
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,
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Line-level Connection
Figure 1 shows connection to a pre-amplifier's main outputs and returning
them to your amplifier inputs.
When installed in this fashion, your satellite speakers will be crossed over
at 80Hz which removes the lower bass from your amplifier and speakers,
enabling them to do a better job reproducing high frequencies. By utilizing
this method, you will have a bi-amplified system, gaining improved power
and headroom for your system.
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.
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/DIRECT on the rear panel of the subwoofer and set
to the DIRECT position. This will eliminate the internal crossover from the
signal path.
Note: If not using an external crossover, you should use the built-in
crossover for optimal performance. When using a single channel input
(such as a surround sound processor's subwoofer out or LFE), the auto
on/off circuit sensitivity will be affected. When one input channel is used
instead of two, the unit will see lower signal levels present at the inputs.
This may cause the unit to turn off when listening at low volume levels.
If this occurs, simply use a "Y" adapter (available from most dealers) to
allow your processor's single sub line to be fed into both L&R inputs.
This will make the unit turn on at lower signal levels.
Subwoofer Outputs