Velodyne Acoustics HGS-15 THX - Manual (Page 5)

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Congratulations!
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Congratulations on your purchase of a Velodyne subwoofer system. This system
represents the absolute state of the art in accurate low frequency reproduction. We
believe this to be the finest subwoofer available anywhere! In this new subwoofer,
we have combined our radical new driver & amplifier designs to obtain our
traditionally accurate sound while increasing efficiency and output to new standards.
This exceptional subwoofer will provide you with years of unparalleled listening
pleasure. Enjoy!
Caution!
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Please observe the following instructions to insure safe and proper system
operation.
Note: Do not move unit while turned on or plugged in!!! Do not leave
unit in direct sunlight or use in high humidity environments!!!
Warning!
To prevent fire or shock hazard, do not expose this equipment to rain or moisture.
To avoid electrical shock, do not open speaker enclosure or amp chassis cover.
Please observe all warnings on the equipment itself. There are no user serviceable
parts inside. Please refer all service questions to your authorized Velodyne dealer.
Prior to installation
Please unpack the system carefully! This unit is extremely heavy. Use caution when
lifting of moving to avoid injury. Remove all staples used to seal the carton as they
can scratch the cabinet. Please save the carton and all packaging materials for
future use. Packing this unit in any other carton may result in severe damage when
shipping. Please take a moment to record the serial number and date/location of
purchase in the space provided on the warranty card for future reference.
As in our other servo products, we then incorporated closed-loop accelerometer based
servo-control of the loudspeaker. At the heart of this control system is a low mass
accelerometer rigidly attached to the voice coil. The accelerometer continuously monitors
cone motions, providing us with a feedback signal for the servo control circuitry. This high-
gain system is designed to improve linearity and reduce distortion approximately 30 times
over conventional non-servo systems. While the input signal is being sent to the amplifier
which powers the driver, a continuous signal representing cone motion is being sent to a
comparator circuit. This circuit constantly adjusts for any deviation between the input
signal and the subwoofer's output. This self regulation results in extreme control over cone
movement, and very accurate low distortion sound.
To provide the power for driving this massive loudspeaker, we incorporated an extremely
efficient Class D switching amplifier. One that is capable of running cool to the touch and
providing 1250 watts (RMS) and 3000 watts peak power! At typical listening levels, the HGS-
15 THX Ultra 2 and HGS-18 THX Ultra 2 produce less than 0.5% harmonic distortion with
input signals extending to 20Hz and below. Even at their maximum output level, the
distortion barely exceeds 1%, far better than any conventional design currently on the
market. This combination provides you with the best combination of clean, deep, accurate
bass, without making any sacrifice to distortion.
Care of your subwoofer
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Do not use any harsh detergents or chemicals to clean the cabinet. Abrasives, detergents,
or cleaning solutions may damage the finish on the cabinet. We recommend using a damp
cloth to clean the cabinet. During normal conditions, your new subwoofer may be left on
continuously without any problems. The unit is equipped with a signal-sensing turn on/off
that will automatically turn on the unit when a signal is present at the inputs and turn off
the unit after several minutes when there is no longer any signal at the inputs. If you plan
to leave the subwoofer unused for an extended period of time, we recommend that you
turn off the master power switch on the rear panel.
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continued. . .