Velodyne | Digital Servo DS-10 | Owner`s manual | Velodyne Digital Servo DS-10 Owner`s manual

Velodyne Digital Servo DS-10 Owner`s manual
"If you know subwoofers, you know about Velodyne."
-Corey Greenberg
Home Theater Technology/February 1995
Face Off: Comparison of five subwoofers
"...the HGS-10 can be used in settings where a larger, more conventional
subwoofer would be unacceptable. In addition, its performance is good
enough that it's worth considering even if space is not an issue. Just be
prepared to watch your friends' jaws drop when you tell them the bass
they're hearing is coming from that little box."
HGS 10 & 12
Owner's Manual
-Robert Deutsch
Stereophile Guide to Home Theater/September 1998
"In general, the Velodyne (HGS-12) could play slightly louder, and often
cleaner, than the Sunfire."
"The Velodyne HGS-12 was an excellent performer whose output and bass
extension were competitive with those of much larger subwoofers. With its
compact size, sturdiness, good looks, and low distortion, it warrants serious
-D.B. Keele, Jr.
Audio/ June 1998
Velodyne Acoustics, Inc.
1070 Commercial St. Suite #101
San Jose, CA 95112
408.436.7270 voice
408.436.7276 fax
Service Department - Ext. 3019
Product Questions - Ext. 3070
Web Site:
High Gain Servo-Controlled
Audio/Video Subwoofer System
Printed on recycled paper.
#63-617 Rev. B
Other Velodyne Subwoofer Products:
F Series
VA-X Series
CT Series
To request literature on any of these products call 1-800-VELODYNE
Date: _____________
MODEL# ________________
Installed by: _____________________ Phone: _______________
To reduce the risk of electric shock, do not remove cover (or back). No user-serviceable
parts inside. Refer servicing to qualified service personnel.
Volume Setting: ____________
The lighting flash with arrowhead symbol is intended to alert the user to the presence of uninsulated
"dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a
risk of electric shock to persons.
Output Level (dB): _________
Low Pass X-Over: _________ Hz
The exclamation point symbol is intended to alert the user to the presence of important operating and
maintenance (servicing) instructions in the literature accompanying the subwoofer.
Phase Pos.: 0˚ ________
180˚ ________
High Pass X-Over: 80 Hz _________
Sub Sonic: 20 Hz _________
100 Hz _________
35 Hz _________
Left Front: _________ dB
Right Front: _________ dB
Left Rear: _________ dB
Right Rear: _________ dB
Center: _________ dB
DATE PURCHASED _______________________________________
DEALER _________________________________________________
SERIAL # ________________________________________________
*NOTE: Please complete and return your warranty card within ten (10) days.
Read Instructions -- All safety and operating instructions should be read before the subwoofer is operated.
Retain Instructions -- The safety and operating instructions should be retained for future reference.
Heed Warnings -- All warnings on the subwoofer and in the operating instructions should be adhered to.
Follow Instructions -- All operating and use instructions should be followed.
Water and Moisture -- The subwoofer should not be used near water -- for example, near a bathtub, washbowl,
kitchen sink, laundry tub, in a wet basement, near a swimming pool or the like.
Carts and Stands -- The subwoofer should be used only with a cart or stand recommended by the manufacturer.
Wall or Ceiling Mounting -- The subwoofer should be mounted to a wall or ceiling only as recommended by
the manufacturer.
Ventilation -- The subwoofer should be situated so that its location or position does not interfere with its proper
ventilation. For example, the subwoofer should not be situated on a bed, sofa, rug, or similar surface that may
block the ventilation openings; or placed in a built-in installation such as a bookcase or cabinet that may impede
the flow of air through the ventilation openings.
Heat -- The subwoofer should be situated away from heat sources such as radiators, heat registers, stoves,
or other subwoofers that produce heat.
Power Sources -- The subwoofer should be connected to a power supply only of the type described in the
operating instructions or as marked on the subwoofer.
Power-Cord Protection -- Power-supply cords should be routed so that they are not likely to be walked on or
pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience
receptacles, and the point at which they exit from the subwoofer.
Caution: To prevent electrical shock, match wide blade of plug to wide slot, fully inserted.
Cleaning -- The subwoofer should be cleaned only as recommended by the manufacturer.
Nonuse Periods -- The power cord of the subwoofer should be unplugged from the outlet when left unused for
a long period of time.
Object and Liquid Entry -- Care should be taken so that objects do not fall and liquids are not spilled onto the
Damage Requiring Service -- The subwoofer should be serviced by qualified service personnel when:
The power-supply cord or plug has been damaged.
Objects have fallen or liquid has been spilled into the subwoofer.
The subwoofer has been exposed to rain.
The subwoofer does not appear to operate normally or exhibits a marked change in performance.
The subwoofer has been dropped or damaged.
Servicing -- The user should not attempt to service the subwoofer beyond what is described in the operating
Overloading - Do not overload wall outlets, extension cords, or integral convenience receptacles as this can
result in a risk of fire or electric shock.
Replacement parts - When replacement parts are required, be sure the service technician has used
replacement parts specified by the manufacturer or have the same characteristics as the original part.
Unauthorized substitutions may result in fire, electric shock, or other hazards.
Safety Check - Upon completion of any service or service of repairs to this product, ask the service technician
to perform safety checks to determine that the product is in proper operating condition.
All other servicing should be referred to qualified service personnel.
Specifications are subject to change without notice.
Anleitungen lesen - Alle Sicherheits- und Bedienungsanleitungen vor Inbetriebnahme des Subwoofers
aufmerksam durchlesen.
Anleitungen aufbewahren - Die Sicherheits- und Bedienungsanleitungen zur späteren Bezugnahme
Warnungen beachten - Alle Warnungen am Subwoofer und in der Bedienungsanleitung unbedingt beachten.
Anleitungen befolgen - Alle Bedienungs- und Gebrauchsanleitungen genau befolgen.
Wasser und Feuchtigkeit - Subwoofer nicht in der Nähe von Wasser aufstellen, d.h. neben einer Badewanne,
Spüle, Waschmaschine, in einem feuchten Keller, in der Nähe des Swimmingpools o.ä..
Rollwagen und Ständer - Subwoofer nur mit einem vom Hersteller empfohlenen Rollwagen oder Ständer
Wand- oder Deckenbefestigung - Subwoofer nur den Herstellerempfehlungen gemäß an der Wand oder
Decke befestigen.
Belüftung - Subwoofer so aufstellen, daß die erforderliche Belüftung nicht behindert wird. D.h., Subwoofer
nicht auf einer weichen Oberfläche wie einem Bett, Sofa, Teppich o.ä. aufstellen, die die Belüftungsöffnungen
blockieren kann. Subwoofer gleichfalls nicht in einem Regal oder Schrank unterbringen, worin die Luftzufuhr
behindert wird.
Wärme - Subwoofer nicht in der Nähe von Wärmequellen, wie Heizkörpern, Wärmespeichern, Öfen oder
anderen wärmeerzeugenden Subwoofern aufstellen.
Netzanschluß - Subwoofer nur an eine der in der Bedienungsanleitung beschriebenen oder auf dem
Subwoofer angegebenen Stromquellen anschließen.
Netzkabelschutz - Netzkabel so verlegen, daß nicht daraufgetreten wird oder sie durch darauf-oder
dagegengestellte Gegenstände eingeklemmt werden können. Die Anschlußstellen des Netzkabels an
Steckdosen und am Subwoofer dabei besonders beachten.
„Vorsicht“: Zur Vermeidung von Gefahr durch elektrischen Schlag sicherstellen, daß der Schutzkontakt
des Steckers vollständig in die Steckdose eingeführt ist.
Reinigung - Subwoofer nur den Herstellerempfehlungen gemäß reinigen.
Betriebsfreie Zeiträume - Netzkabel des Subwoofers aus der Steckdose ziehen, wenn er über einen längeren
Zeitraum nicht benutzt wird.
Beschädigungen durch Gegenstände oder Flüssigkeiten - Es ist darauf zu achten, daß keine Gegenstände auf
das Gehäuse fallen oder Flüssigkeiten darauf verschüttet werden.
Beschädigungen, die eine Reparatur erforderlich machen - Subwoofer sollte von qualifiziertem Fachpersonal
repariert werden, wenn:
Das Netzkabel oder der Stecker beschädigt sind.
Gegenstände oder Flüssigkeiten in den Subwoofer gelangt sind.
Der Subwoofer dem Regen ausgesetzt wurde.
Der Betrieb des Subwoofers gestört ist oder seine Leistung deutlich nachgelassen hat.
Der Subwoofer fallengelassen oder beschädigt wurde.
Reparatur und Wartung - Durch den Benutzer auszuführende Wartungsmaßnahmen des Subwoofers sind auf
die in der Bedienungsanleitung angegebenen Prozeduren beschränkt.
Überlastung - Zur Vermeidung von Brandgefahr und elektrischem Schlag Wandsteckdosen,
Verlängerungskabel bzw. eingebaute Steckdosen nicht überlasten.
Ersatzteile - Wenn Ersatzteile benötigt werden, sicherstellen, daß der Servicetechniker entweder die
vom Hersteller angegebenen Ersatzteile benutzt oder Teile, die den Originalteilen entsprechende
Kennwerte besitzen. Die Verwendung von Ersatzteilen, die nicht zugelassen sind, kann Brände,
elektrischen Schlag oder andere Gefahren verursachen.
Sicherheitsprüfung - Nach Beendigung von Wartungs- oder Reparaturmaßnahmen an diesem Produkt
vom Servicetechniker Sicherheitsprüfungen zum Nachweis des ordnungsgemäßen Betriebszustandes
vornehmen lassen.
Alle anderweitigen Servicemaßnahmen von qualifiziertem Wartungspersonal durchführen lassen.
51 lbs.
40Hz - 120Hz
40Hz - 120Hz
(12 dB/octave initial, 48 dB/octave ultimate)
0° / 180°
0° / 180°
1000 watts RMS/2400 peak 1250 watts RMS/3000 peak
10", high-excursion 2" max. 12", high-excursion 2" max.
310oz.(19.3 lbs.)
310oz. (19.3 lbs.)
Tandem 3" push-pull
Tandem 3" push-pull
Line-level, 80Hz up
Line-level, 80Hz up
Low Pass Crossover
45 lbs.
14" x 14.5" x 14"
20Hz - 120Hz +/- 3 dB
<1% (typical)
20Hz or 35Hz
80Hz (6 dB/octave) 80Hz (6dB/octave)
Zur Vermeidung von Gefahr durch elektrischen Schlag, Deckel (oder Rückwand) nicht
abnehmen. Produkt enthält keine Anwenderteile. Reparatur und Wartung nur von qualifiziertem
Fachpersonal vornehmen lassen.
Das Blitzsymbol dient als Hinweis auf unisolierte „gefährliche Spannungen“ innerhalb des Gehäuses,
deren Werte eine Berührungsgefahr für den Menschen darstellen können.
Das Symbol mit dem Ausrufungszeichen dient als Hinweis auf wichtige, in den Unterlagen des
Subwoofers enthaltene Bedienungs- und Wartungsvorschriften.
Two years
11" x 11.5" x 11"
20Hz - 120Hz +/- 3 dB
<1% (typical)
20Hz or 35Hz
Cabinet (W/H/D w/o grille)
Frequency Response
Harmonic Distortion
Subsonic Filter
High Pass Crossover
Amplifier (Class D)
Woofer (forward firing)
Magnet Structure
Voice Coil
Warranty (parts & labor)
Weight (approx.)
Two years
Troubleshooting & Service
If you should experience a problem with the operation of your subwoofer, please check all
of the following before seeking service. Following is a simple troubleshooting guide to
assist you.
Risque d’électrocution
Ne pas ouvrir
Verify unit is plugged in and power outlet used is active.
Is auto turn on/off set properly?
Is unit receiving an input signal from your source?
Have all controls on subwoofer (volume, crossover, phase, etc.) been properly set?
If unit has been running at high levels for an extended period of time, one of the
protection circuits may be engaged.
•Has the built-in amplifier overheated?
•Is your power line voltage sagging under heavy use?
If the protection circuitry is active, the unit may cycle on and off until operating parameters
return to normal. Under more serious conditions, the unit may shut off completely.
Normal operation will return upon cooling, but you may be required to unplug the unit
The following conditions require service by a qualified technician:
1. The power cord has become damaged.
2. The unit does not appear to operate normally or exhibits a marked change in
3. The unit has been exposed to water.
4. Some part of the cabinet or circuitry is physically damaged.
Velodyne Service Department: (408) 436-7270 Ext. 3019
Thank you for purchasing a Velodyne!
continued. . .
Attention: Afin d’éviter tout risque d’électrocution, ne pas enlever le boitier (ou partie arrière de l’enceinte).
Aucune pièce ne doit être manipulée par l’utilisateur. Pour tout entretien, vous référer à un
personnel de service qualifié.
Le symbol de l’éclair avec la flèche sert à avertir l’utilisateur de la présence d’un “voltage dangereux” non isolé
dans l’enceinte du produit d’une magnitude pouvant constituer un risque
d’électrocution de personnes.
Le symbol du point d’exclamation sert à avertir l’utilisateur que d’importants conseils de fonctionnement et de
maintenance (entretien) sont fournis avec l’enceinte d’extrêmes graves.
Lire le mode d’emploi - Tous les conseils de sécurité et de fonctionnement doivent être lus avant de
mettre en marche l’enceinte.
Garder le mode d’emploi - Il est conseillé de conserver les conseils de sécurité et de fonctionnement
pour un éventuel usage futur.
Avertissements - Il est important de se conformer à tous les conseils de fonctionnement concernant
l’enceinte et à toutes les instructions inscrites sur l’enceinte.
Suivre les conseils - Tous les conseils d’utilisation et de fonctionnement doivent être suivis à la règle.
Eau et humidité - Ne pas utiliser l’enceinte près d’une source d’eau - par exemple, près de la baignoire,
d’une bassine de lavage, d’un évier de cuisine, d’un bac à lavage, dans un sous-seul mouillé, près d’une
Pieds et Supports - N’utiliser que des pieds et supports recommandés par le fabricant.
Assemblage mural ou au plafond - Se conformer uniquement aux instructions du fabricant pour fixer
l’enceinte sur un mur ou sur un plafond.
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 ouvertures de ventilation ; ne pas poser l’enceinte dans une meuble encastré ou fermé telle
qu’une bibliothèque ou un meuble qui empêche l’air de circuler par les ouvertures de ventilation de
Chaleur - Placer l’enceinte loin de toute source de chaleur tels que radiateurs, compteurs thermiques, fours
ou autres enceintes dégageant de la chaleur.
10. Sources d’électricité - Ne brancher l’enceinte que dans une prise du type décrit dans le mode d’emploi ou
comme indiqué par le fabricant.
11. Protection du cordon électrique - Les cordons électriques doivent être fixés pour éviter que toute personne
ne marche dessus et que rien ne puisse être placé sur ou contre eux - faire tout particulièrement attention
aux cordons branchés dans des prises électriques, à des réceptacles et à leurs points de sorties de
12. ”Attention : Afin d’éviter tout choc électrique, introduire la lame la plus large de la fiche dans la borne
correspondante de la prise et pousser jusqu’au fond”.
13. Nettoyage - Pour le nettoyage de l’enceinte, suivre scrupuleusement les instructions du fabricant.
14. Périodes de non-utilisation - Le cordon électrique de l’enceinte doit rester débranché si l’enceinte reste
inutilisée pendant une longue période de temps.
15. Infiltration d’objet ou de liquide - Faire attention à ce qu’aucun objet ne tombe et à ce qu’aucun liquide ne
soit versé sur l’enceinte.
16. Dommages nécessitant réparation - L’enceinte ne doit être réparée que par du personnel qualifié lorsque :
le cordon électrique ou la prise ont été endommagés.
Des objets sont tombés ou du liquide a été versé sur l’enceinte.
L’enceinte a été exposée à la pluie.
L’enceinte ne semble pas fonctionner normalement ou indique un changement de performance.
L’enceinte est tombée par terre ou a été endommagée.
17. Entretien - L’utilisateur ne doit pas tenter de réparer l’enceinte au-delà de ce qui est décrit dans le mode
18. Surcharge - Ne pas surcharger les prises murales, les rallonges, ou les prises femelles encastrées de
commodité. On risquerait un incendie ou un choc électrique.
19. Pièces de rechange - Lorsque le remplacement d’une pièce s’avère nécessaire, s’assurer que le technicien
utilise la pièce spécifiée par le fabriquant, ou une pièce possédant les mêmes caractéristiques que la pièce
d’origine. Les substitutions non autorisées peuvent provoquer des incendies ou des chocs électriques, ou
présenter d’autres dangers.
20. Contrôle de sécurité - Après toute intervention technique sur ce produit (neuf ou réparé), demander au
technicien de procéder à un contrôle de sécurité pour vérifier qu’il est en bon état de marche.
Toute autre réparation doit être référée à du personnel qualifié.
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 one of the finest subwoofers 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!
Please observe the following instructions to insure safe and proper system
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 heavy. Use caution when lifting or
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.
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. This new amplifier features our patent pending energy
recovery circuit design which drastically reduces wasted energy (heat) as compared to
traditional switching designs. One that is capable of running cool to the touch and
providing 1000 or 1250 watts (RMS - depending on the model) of power! At typical listening
levels, the HGS produces less than 1% harmonic distortion with input signals extending to
20Hz. At higher levels 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
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
unplug the unit.
Important Note: Do not move unit while plugged in!
continued. . .
continued. . .
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. . .
The Velodyne servo-control solution
The Velodyne HGS subwoofers produce 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 (1-1/4" to be exact) of linear
motion, with a maximum mechanical limit of 2" peak to peak. 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. After optimizing every remaining
part of the loudspeaker, we then turned to the electronics.
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 a feedback signal for the servo control circuitry. This high-gain
system is designed to improve linearity and reduce distortion approximately 30 times over
Product Features & Controls
• 10" or 12" subwoofer with tandem 3" voice coils & 310 oz. motor
• Built-in 1000/1250 watt (RMS) high efficiency class D amplifier
• Accelerometer based servo control system for extreme accuracy
• Adjustable (40 to 120Hz) low-pass crossover (defeatable)
• Multiple staggered low-pass crossovers; 12dB/octave initial,
48dB/octave ultimate
• Line-level (RCA) inputs & outputs
• 80 Hz high-pass crossover output
• Signal sensing auto turn on/off (defeatable)
• Variable volume control
• Selectable phase control (0˚ or 180˚)
• Selectable subsonic filter (20Hz or 35Hz)
• Frequency response of 20Hz - 120Hz +/- 3dB
• Detachable power cord
• Anti-clipping circuit prevents over excursion & amp clipping
• Optional remote control with power, volume and mute functions
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 subwoofer
Your new subwoofer is equipped with line-level 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. If your receiver/electronics does not have RCA type line level
outputs, you must use a high to low level adapter. Consult the dealer where you purchased
the unit for further details.
continued. . .
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. A good starting point for
the volume control is 4 or 5 dots from minimum.
Low-pass crossover- 40 to 120Hz
The line-level 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 output will be reduced 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.
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 & 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- 20Hz/35Hz
This adjustment alters the low frequency limit of the subwoofer. 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.
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.
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. 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
True subwoofers operate at extremely low frequencies which are primarily omni-directional.
While it is recommended that the subwoofer be placed on the same plane as the satellite
speakers, room and system conditions often dictate otherwise. Keep in mind that frequency
response and output level can be drastically influenced by placement, depending on the
acoustic properties of the listening room. Typically, the optimum location for a subwoofer
is tucked away in a corner of your listening room. This location will usually provide the
greatest output levels with optimum low frequency extension. The worst location for a
subwoofer it 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.
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.
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
Crossover switch- In/Out
This switch allows the electronic crossover circuitry to be removed from the signal path.
This is preferable 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 standby mode, your
subwoofer will draw very minimal power. This function can be disabled by leaving
the switch in the "on" position.
Remote sensor
This connection allows for hook-up of the optional remote control receiver. With this
optional receiver plugged in you will be able to utilize the functions of the remote to control
power, volume and mute functions. Place the infrared receiver within direct line of sight
from your usual listening position.
Detachable power cord
Allows for easy replacement should the original be damaged.
Optional Infrared remote control
The optional remote control unit allows for convenient adjustment of select subwoofer
functions. The power button turns the unit on/off. The volume +/- buttons on the remote
allows you to increase or decrease the output volume of the unit relative to the setting of
the main volume control on the rear panel. The middle reset button returns the remote
volume control to neutral, output level will then be determined by the manual volume
control setting. Initial setup of the unit should be performed with the remote volume at
neutral, while you adjust the manual volume knob to match playback levels. The mute
button silences the unit. If you choose to utilize the remote to turn the unit on/off, we
suggest setting the auto turn on switch to the on position. This deactivates the sensing
circuitry allowing the remote to have total control of unit power.
continued. . .
NOTE: Two AAA batteries are required & included for operation. If the remote
control operating range deteriorates, please check batteries for deterioration.
Do not leave remote placed on heat generating items, such as amplifiers.
Line-level connection
Figure 1 shows connection to a pre-amplifier's main outputs and returning them to your
amplifier inputs.
Figure 1: Installation using line-level inputs
80 Hz
120 Hz
40 Hz
0 ° - 180 ° 20z - 35Hz
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.
Subwoofer outputs
The Velodyne subwoofer is designed to operate using the full range audio signal for input
when using the built-in crossover. Some processors/receivers, have a "subwoofer out" jack
that is internally filtered and designed to be used with a conventional amplifier and speaker.
In some rare cases, combining both an external crossover and the one internal to the
subwoofer may result in low output and increased noise. In these installations you may
need to bypass the internal crossover in either the processor or Velodyne subwoofer. In
some installations, simply setting one crossover to a higher frequency (such as 120 Hz) will
restore maximum performance. 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
X-over, OUT - IN on the rear panel of the subwoofer and set to the OUT position. This
will eliminate the internal crossover from the signal path.
117 V ~
60 Hz
10 A
Note. . .
If not using an external crossover, you should use the built-in crossover for
optimal performance.
Interconnect cables
Serial # Label
When installing your new Velodyne subwoofer using the line level connections, you should
always use shielded phono cables. There are many decent cables available today, most any
of which will work perfectly well. We do recommend that you keep the length of cable as
short as possible to avoid any potential noise problems.
U.S. Patent # 4,727,584 & 4,573,189
When routing cables, try to keep them away from equipment which generates significant
noise such as industrial or digital equipment.
continued. . .
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