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2

Product Features & Controls

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• 15" (12.7" piston diameter) or 18" (15.2" piston diameter) subwoofer with

tandem 3" voice coils and 220 oz. magnet

• Built-in 1250 watt (RMS) high efficiency class D amplifier
• Accelerometer based servo control system for extreme accuracy
• Adjustable (40 to 120Hz) low-pass crossover (defeatable)
• Selectable (80 or 100Hz) high-pass crossover outputs
• Balanced (XLR) inputs
• Line-level (RCA) inputs & outputs
• Speaker-level inputs & outputs with 5 way binding post connections
• Signal sensing auto turn on/off (defeatable)
• Variable volume control
• Selectable phase control (0˚ or 180˚)
• Selectable subsonic filter (15Hz or 35Hz)
• Frequency response of 18-120Hz (HGS-15 THX Ultra 2), 15-120Hz (HGS-18 THX

Ultra 2)

• Detachable power cord
• Magnetically shielded for video use
• Multiple staggered low-pass crossovers; 12dB/octave initial,

48dB/octave ultimate

• Gain compression circuit prevents over excursion & amp clipping
• Infrared remote control with power, volume & mute functions
• External remote connector for custom installation
• Power on & protection indicator LED
• Multi-layer resin laminate cone
• High-excursion rubber surround

11

The Velodyne servo-control solution

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Your  Velodyne  HGS  subwoofer  produces  sound  in  the  same  manner  as  conventional
loudspeakers:  a  cone-shaped  piston  is  forced  to  move  by  means  of  a  linear  motor.
However, this is about the only conventional part of the subwoofer.

We determined that conventional motors are unacceptable when called upon to produce
the amount of linear motion we desired. This inadequacy led us to design an improved
motor  structure  by  incorporating  two  coils,  operating  out  of  phase  in  a  push-pull
configuration within two magnetic gaps & suspended by dual spiders for even greater
linearity. We designed this motor to produce over one  inch (1-1/8" to be exact) of linear
motion, with a maximum mechanical limit of 2". Also, with this unique configuration, the
distortion products are reduced by a factor of two over conventional single coil structures
with dramatically improved cone control. This driver alone would result in less distortion
than any other non servo design. We also designed this motor to be magnetically shielded
from the start, to allow for convenient placement near the television monitors of home
theater systems.

The unique push-pull twin voice coil in these subwoofers is designed and built in-house on
a custom built NC coil winding machine. This unique machine winds this coil in a way like
none other. There are two coils, each with two layers, would on the same former. Two
layers are first wound inside the former and then two layers on the outside. This results in
increased heat dissipation over normal designs which simply pile added layers on top of
each other, burying several layers beneath the surface. We then utilized materials such as
Polyimide resin impregnated fiberglass, for the former. This material is capable of withstan-
ding the extremely high temperatures (320 degrees C) that can occur when driven by our
powerful amplifiers. This results in excellent long-term power handling capabilities.

These speakers also feature our new Multi-Layer Resin Laminate cone system. This new
cone starts with two-layers of reinforced pulp fiber, which are then heat pressed with a
binding resin to form an extremely rigid cone structure. This helps to reduce distortion by
decreasing cone flex and breakup. Attached to the edge of the cone is our newly designed
rubber surround, tailored for long life under the high excursions these units are capable
of.

continued. . .

Содержание HGS-15 THX, HGS-18 THX

Страница 1: ...woofer System Printed on recycled paper If you know subwoofers you know about Velodyne Corey Greenberg Home Theater Technology February 1995 Face Off Comparison of five subwoofers In general the Velodyne could play slightly louder and often cleaner than the Sunfire D B Keele Jr Audio June 1998 How do they get this kind of bass out of such a tiny box Deep tight tuneful and loud enough to rattle pic...

Страница 2: ... situated on a bed sofa rug or similar surface that may block theventilationopenings orplacedinabuilt ininstallationsuchasabookcaseorcabinetthatmayimpede the flow of air through the ventilation openings 9 Heat The subwoofer should be situated away from heat sources such as radiators heat registers stoves or other subwoofers that produce heat 10 Power Sources The subwoofer should be connected to a ...

Страница 3: ...icht in einem Regal oder Schrank unterbringen worin die Luftzufuhr behindert wird 9 Wärme Subwoofer nicht in der Nähe von Wärmequellen wie Heizkörpern Wärmespeichern Öfen oder anderen wärmeerzeugenden Subwoofern aufstellen 10 Netzanschluß Subwoofer nur an eine der in der Bedienungsanleitung beschriebenen oder auf dem Subwoofer angegebenen Stromquellen anschließen 11 Netzkabelschutz Netzkabel so ve...

Страница 4: ...mmandés par le fabricant 7 Assemblage mural ou au plafond Se conformer uniquement aux instructions du fabricant pour fixer l enceinte sur un mur ou sur un plafond 8 Ventilation Il est important de placer l enceinte de telle sorte qu elle ne gêne pas sa propre ventilation Par exemple ne pas placer l enceinte sur un lit un canapé sur la moquette ou sur toute surface similaire qui bloque les ouvertur...

Страница 5: ...celerometercontinuouslymonitors conemotions providinguswithafeedbacksignalfortheservocontrolcircuitry Thishigh gainsystemisdesignedtoimprovelinearityandreducedistortionapproximately30times 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 c...

Страница 6: ...ithin two magnetic gaps suspended by dual spiders for even greater linearity We designed this motor to produce over one inch 1 1 8 to be exact of linear motion with a maximum mechanical limit of 2 Also with this unique configuration the distortion products are reduced by a factor of two over conventional single coil structures with dramatically improved cone control This driver alone would result ...

Страница 7: ...efined as any form of distortion that moves energy from one portion of the audio frequency spectrum to another When a single tone is applied to a nonlinear system the result is harmonic distortion In which some of the energy leaves the system at multiples of the original frequency Whenmultipletonesareapplied intermodulationtonesareproduced usually as simple combinations of the input frequencies Ge...

Страница 8: ...ng the switch in the on position 9 responseandoutputlevelcanbe drastically influencedbyplacement dependingonthe acousticpropertiesofthelisteningroom Typically theoptimumlocationforasubwoofer istuckedawayinacornerofyourlisteningroom Thislocationwillusuallyofferthegreatest output levels and optimum low frequency extension The worst location for a subwoofer it typically far away from any walls and cl...

Страница 9: ...wesuggestsettingtheautoturnonswitchtotheon position Thisdeactivates the sensing circuitry allowing the remote to have total control of unit power NOTE Two AAA batteries are required included for operation If the remote control operatingrangedeteriorates pleasecheckbatteriesfordeterioration Donotleaveremote placed on heat generating items such as amplifiers 5 8 Speaker level connection Figure 2 sho...

Страница 10: ...s AMPLIFIER MAIN OUTPUTS RIGHT LEFT TOSATELLITESPEAKERS PRE AMP MAIN OUTPUTS MAIN INPUTS LEFT RIGHT RIGHT LEFT Figure 2 Installation using speaker level from amplifier inputs INTEGRATED AMP RECEIVER SATELLITE SPEAKERS MAIN OUTPUTS speaker level BALANCED INPUT LEFT COVERED UNDER ONE OR MORE OF THE FOLLOWING U S PATENTS 4 727 584 4 573 189 OTHER PATENTS PENDING 117 V 60 Hz 10A POWER EXTERNAL REMOTE ...

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