Velodyne Acoustics HGS-15X THX - Manual (Page 8)

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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 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.
Subsonic - 15Hz (THX)/35Hz
This adjustment alters the low frequency limit of the subwoofer. For most systems
we recommend the 15Hz setting which will allow the subwoofer to deliver the
maximum low bass output it was designed for. In certain movie theater installations
which suggest that the extreme low bass be limited, move the switch position to 35Hz
and the response will be attenuated below this frequency.
Crossover switch - In/Out (THX)
This switch allows the electronic 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 OUT to disengage the built
in crossover. For all other installations which do not have a separate
electronic crossover we recommend you leave the internal crossover IN
to provide optimum performance.
Auto turn on function
With this function in the "auto" position, your subwoofer can be safely left
with the main power switch on continuously. The subwoofer will turn itself
on automatically when an audio signal is present. If no signal is present for
approximately 15 minutes, the unit will switch to standby mode. While in
standy mode, your subwoofer will draw very minimal power. This function
can be disabled by leaving the switch in the "on" position.
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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 subwoofer is 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. However, this shielding may not be adequate
in certain extremely sensitive installations. 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.
Protection Circuitry
Your new subwoofer is equipped with special protection circuitry to
provide maximum performance with greatest reliability.
The unit is protected against:
1) Overdriving the speaker or amplifier.
2) Overheating the amplifier.
3) Excessive drop in power line voltage.
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The first type of protection circuitry which prevents overdriving of the
speaker or amplifier operates constantly without being audible under most
situations. In some extreme situations (sustained high output levels such as
pro sound usage), the unit may shut down momentarily. The blue power led
may also blink rapidly. This indicates operation of the thermal or undervoltage
protection circuitry. If this should happen, you should reduce the volume
setting or shut the unit off until normal operating conditions return. You may
also want to plug the unit into a different wall outlet, as dropping power line
voltage will be most noticeable under strenuous conditions.