Velodyne Acoustics Speaker HGS 10 User Manual

"If you know subwoofers, you know about Velodyne."  
-Corey Greenberg  
Home Theater Technology/February 1995  
Face Off: Comparison of five subwoofers  
HGS 10 & 12  
Owner's Manual  
"...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."  
-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  
compactsize, sturdiness, goodlooks, andlowdistortion, itwarrantsserious  
consideration."  
-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  
HighGainServo-Controlled  
Audio/Video Subwoofer System  
Printed on recycled paper.  
#63-617 Rev. B  
 
INSTALLATION  
WORKSHEET  
IMPORTANT SAFETY INSTRUCTIONS  
CAUTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
Date: _____________  
MODEL# ________________  
Caution: To reduce the risk of electric shock, do not remove cover (or back). No user-serviceable  
parts inside. Refer servicing to qualified service personnel.  
Installed by: _____________________ Phone: _______________  
Volume Setting: ____________ Output Level (dB): _________  
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.  
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.  
Low Pass X-Over: _________ Hz  
Phase Pos.: 0˚ ________  
180˚ ________  
1.  
2.  
3.  
4.  
5.  
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.  
WaterandMoisture--Thesubwoofershouldnotbeusednearwater--forexample,nearabathtub,washbowl,  
kitchen sink, laundry tub, in a wet basement, near a swimming pool or the like.  
6.  
7.  
CartsandStands--Thesubwoofershouldbeusedonlywithacartorstandrecommendedbythemanufacturer.  
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 theventilationopenings;orplacedinabuilt-ininstallationsuchasabookcaseorcabinetthatmayimpede  
the flow of air through the ventilation openings.  
High Pass X-Over: 80 Hz _________  
100 Hz _________  
Sub Sonic: 20 Hz _________  
35 Hz _________  
8.  
9.  
Heat -- The subwoofer should be situated away from heat sources such as radiators, heat registers, stoves,  
or other subwoofers that produce heat.  
Output  
Levels:  
(Speakers)  
10. 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.  
11. 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.  
12. Caution: To prevent electrical shock, match wide blade of plug to wide slot, fully inserted.  
13. Cleaning -- The subwoofer should be cleaned only as recommended by the manufacturer.  
14. Nonuse Periods -- The power cord of the subwoofer should be unplugged from the outlet when left unused for  
a long period of time.  
Left Front: _________ dB  
Left Rear: _________ dB  
Right Front: _________ dB  
Right Rear: _________ dB  
15. Object and Liquid Entry -- Care should be taken so that objects do not fall and liquids are not spilled onto the  
enclosure.  
Center: _________ dB  
16. Damage Requiring Service -- The subwoofer should be serviced by qualified service personnel when:  
a.  
b.  
c.  
d.  
e.  
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.  
FOR YOUR RECORDS. . .  
DATEPURCHASED _______________________________________  
DEALER _________________________________________________  
SERIAL# ________________________________________________  
17. Servicing -- The user should not attempt to service the subwoofer beyond what is described in the operating  
instructions.  
18. Overloading - Do not overload wall outlets, extension cords, or integral convenience receptacles as this can  
result in a risk of fire or electric shock.  
19. 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.  
20. 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.  
*NOTE: Please complete and return your warranty card within ten (10) days.  
13  
 
WICHTIGE SICHERHEITSHINWEISE  
VORSICHT  
GEFÄHRLICHE SPANNUNG  
NICHT ÖFFNEN  
Vorsicht: 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.  
1.  
Anleitungen lesen - Alle Sicherheits- und Bedienungsanleitungen vor Inbetriebnahme des Subwoofers  
aufmerksam durchlesen.  
2.  
Anleitungen aufbewahren - Die Sicherheits- und Bedienungsanleitungen zur späteren Bezugnahme  
aufbewahren.  
3.  
4.  
5.  
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  
benutzen.  
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.  
6.  
7.  
8.  
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 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.  
12. „Vorsicht“: Zur Vermeidung von Gefahr durch elektrischen Schlag sicherstellen, daß der Schutzkontakt  
des Steckers vollständig in die Steckdose eingeführt ist.  
13. Reinigung - Subwoofer nur den Herstellerempfehlungen gemäß reinigen.  
14. Betriebsfreie Zeiträume - Netzkabel des Subwoofers aus der Steckdose ziehen, wenn er über einen längeren  
Zeitraum nicht benutzt wird.  
15. Beschädigungen durch Gegenstände oder Flüssigkeiten - Es ist darauf zu achten, daß keine Gegenstände auf  
das Gehäuse fallen oder Flüssigkeiten darauf verschüttet werden.  
16. Beschädigungen, die eine Reparatur erforderlich machen - Subwoofer sollte von qualifiziertem Fachpersonal  
repariert werden, wenn:  
a.  
b.  
c.  
d.  
e.  
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.  
17. Reparatur und Wartung - Durch den Benutzer auszuführende Wartungsmaßnahmen des Subwoofers sind auf  
die in der Bedienungsanleitung angegebenen Prozeduren beschränkt.  
18. Überlastung - Zur Vermeidung von Brandgefahr und elektrischem Schlag Wandsteckdosen,  
Verlängerungskabel bzw. eingebaute Steckdosen nicht überlasten.  
19. 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.  
20. Sicherheitsprüfung - Nach Beendigung von Wartungs- oder Reparaturmaßnahmen an diesem Produkt  
vom Servicetechniker Sicherheitsprüfungen zum Nachweis des ordnungsgemäßen Betriebszustandes  
vornehmen lassen.  
12  
Alle anderweitigen Servicemaßnahmen von qualifiziertem Wartungspersonal durchführen lassen.  
 
IMPORTANTES CONSIGNES DE SECURITE  
Troubleshooting & Service  
ATTENTION  
Risque d’électrocution  
Ne pas ouvrir  
––––––––––––––––––––––––––––––––––––––––––––––——————––––––  
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.  
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  
1. Verify unit is plugged in and power outlet used is active.  
2. Is auto turn on/off set properly?  
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.  
3. Is unit receiving an input signal from your source?  
4. Have all controls on subwoofer (volume, crossover, phase, etc.) been properly set?  
5. If unit has been running at high levels for an extended period of time, one of the  
protection circuits may be engaged.  
1.  
2.  
3.  
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.  
4.  
5.  
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  
piscine…  
•Has the built-in amplifier overheated?  
•Is your power line voltage sagging under heavy use?  
6.  
7.  
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.  
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 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  
l’enceinte.  
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  
momentarily.  
9.  
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  
l’enceinte.  
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.  
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  
performance.  
3. The unit has been exposed to water.  
4. Some part of the cabinet or circuitry is physically damaged.  
16. Dommages nécessitant réparation - L’enceinte ne doit être réparée que par du personnel qualifié lorsque :  
a.  
b.  
c.  
d.  
e.  
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.  
Velodyne Service Department: (408) 436-7270 Ext. 3019  
17. Entretien - L’utilisateur ne doit pas tenter de réparer l’enceinte au-delà de ce qui est décrit dans le mode  
d’emploi.  
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.  
Thank you for purchasing a Velodyne!  
continued. . .  
11  
 
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.  
Congratulations!  
–––––––––––––––––––––––––––––––––––––––––––––––—————–  
Congratulations on your purchase of a Velodyne subwoofer system. This system  
representstheabsolutestateoftheartinaccuratelowfrequencyreproduction.We  
believe this to be one of the finest subwoofers available anywhere! In this new  
subwoofer, wehavecombinedourradicalnewdriver&amplifierdesignstoobtain  
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!  
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.  
Caution!  
––––––––––––––––––––––––––––––––––––––––––––––––—————  
Please observe the following instructions to insure safe and proper system  
operation.  
Care of your subwoofer  
Warning!  
––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––  
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.  
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.  
Important Note: Do not move unit while plugged in!  
continued. . .  
continued. . .  
1
10  
 
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.  
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˚)  
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,  
isthatthe"missing"basswasnevertheretobeginwith!Distortionproductsofconventional  
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. . .  
• 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  
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.  
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  
foryoursystem. Remembertoperformallinstallationprocedureswithsubwoofer  
unplugged!!!  
Inputs  
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  
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. . .  
9
2
 
Volume control  
Protection circuitry  
––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––  
Your new subwoofer is equipped with special protection circuitry to provide maximum  
performance with greatest reliability.  
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.  
The unit is protected against:  
Low-pass crossover- 40 to 120Hz  
1)Overdriving the speaker or amplifier.  
2)Overheating the amplifier.  
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.  
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.  
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!  
Distortion in loudspeakers  
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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.  
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.  
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  
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8
 
Crossover switch- In/Out  
Placement  
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.  
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Truesubwoofersoperateatextremelylowfrequencieswhichareprimarilyomni-directional.  
While it is recommended that the subwoofer be placed on the same plane as the satellite  
speakers,roomandsystemconditionsoftendictateotherwise.Keepinmindthatfrequency  
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.  
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 automati-  
cally 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.  
Caution!  
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.  
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.  
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.  
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.  
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.  
continued. . .  
7
4
 
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.  
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.  
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.  
Line-level connection  
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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  
LOW-PASS  
CROSSOVER  
80 Hz  
SUBWOOFER  
VOLUME  
REMOTE  
PHASE  
SUBSONIC X-OVER  
POWER  
MIN  
MAX  
120 Hz  
40 Hz  
20z  
-
35Hz  
OUT  
-
IN  
AUTO ON SENSOR  
-
0
°
-
180  
°
80Hz  
117 V  
60 Hz  
~
10 A  
HIGH-PASS  
OUTPUT  
INPUT  
L
Note. . .  
R
CAUTION:  
UNPLUG UNIT BEFORE MOVING  
If not using an external crossover, you should use the built-in crossover for  
optimal performance.  
CAUTION!  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR  
VELODYNE ACOUSTICS, INC.  
TANDEM 3" PUSH-PULL MOTORS  
310 oz. MOTOR STRUCTURE  
PATENTED HIGH GAIN SERVO  
Interconnect cables  
Serial # Label  
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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.  
WARNING: TO REDUCE THE RISK OF  
FIRE OR ELECTRIC SHOCK DO NOT EXPOSE  
THIS APPLIANCE TO RAIN OR MOISTURE  
U.S. Patent  
#
4,727,584  
&
4,573,189  
AMPLIFIER  
PRE-AMP  
MAIN INPUTS  
MAIN OUTPUTS  
MAIN OUTPUTS  
RIGHT  
LEFT  
LEFT RIGHT  
LEFT RIGHT  
When routing cables, try to keep them away from equipment which generates significant  
noise such as industrial or digital equipment.  
TO SATELLITE SPEAKERS  
continued. . .  
5
6
 

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