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3

Important!!!
Do not use both LINE LEVEL and SPEAKER LEVEL connections simultaneously!

Volume control

This control allows you to balance the output from the subwoofer to the main speakers/
amplifier in your system. This control should be set to achieve similar output level from
both the main speakers and subwoofer when listening to music. The remote may then be
used for minute/temporary adjustments, such as increasing the volume for home theater
usage.

Low-pass crossover- 40 to 120Hz

All  inputs  sum  the  left  and  right  channels  together,  with  the  resulting  signal  passing
through an adjustable low-pass crossover before being amplified. The crossover control
allows you to adjust the upper limit of the subwoofer's frequency response from 40 to
120Hz. The subwoofer's response will begin rolling off above the frequency you set this
control  to.  You  should  set  the  crossover  frequency  to  obtain  a  smooth  and  seamless
transition from the subwoofer to the main speakers in your system. If your main speakers
are smaller units with limited low frequency output, you may wish to choose a higher
frequency (such as 100-120Hz) than you would with larger speakers which have greater low
frequency output. With larger speakers, you might start with this control set lower, such
as 80Hz.

10

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.

Distortion in loudspeakers

––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Nonlinear  distortion  is  a  problem  which  plagues  all  speakers.  This  particular  type  of
distortion is a common problem in subwoofers, which must move large amounts of air to
produce  adequate  levels  of  deep  bass.  Nonlinear  distortion  is  defined  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. When multiple tones are applied, intermodulation tones are produced, usually
as simple combinations of the input frequencies. Generally, 3% distortion is considered a
reasonable amount for speakers. This means that 3% of the total energy leaving the speaker
is at frequencies other than the intended input signal.

Most subwoofers on the market today however, produce much more than 3% distortion
at  common  listening  levels.  Many  models  we  have  tested  produce  greater  than  20%
distortion @ 20Hz when driven to 100dB. This is a typical output level obtained in many
systems,  particularly  home  theater  systems.  Even  at  1  watt,  many  conventional  units
produce several percent distortion. Secondly, the odd order, higher harmonics are much
more offensive to the human ear than the closer 2nd harmonic.

An interesting result of this reduced distortion is that some of the bass, when played over
an extremely accurate subwoofer system, seems to actually be missing. The truth, however,
is that the "missing" bass was never there to begin with! Distortion products of conventional
woofers actually add to the bass spectrum making it appear louder than recorded. This is
due to the additional and unwanted harmonics (distortion) of the fundamental signal.
While conventional subwoofers offer little to combat distortion products, we at Velodyne
have developed another way. . .

continued. . .

Installation

——————————————————————————————————————————————
Your new Velodyne servo subwoofer provides for a number of installation options. Read
all the installation information below in order to determine which installation option is best
for your system. 

Remember to perform all installation procedures with system

power turned off!!!

Inputs

Your new subwoofer is equipped with speaker-level, line-level and balanced (XLR)  inputs.
Use  the 

LINE  LEVEL

  jacks  when  connecting  your  subwoofer  to  a  pre-amp,  signal

processor, line-level crossover, or receiver with pre-amp level outputs. The 

SPEAKER

LEVEL

 jacks connect directly to the speaker outputs of any amplifier, integrated amplifier

or receiver. Your amplifier section will notice no additional loading effects when you use
these inputs due to their very high impedance.

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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