Velodyne Acoustics Speaker HGS 15X THX User Manual

HGS-15XTHXUltra2  
Owner'sManual  
HighGainServo-Controlled  
Audio/Video Subwoofer System  
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IMPORTANTES CONSIGNES DE SECURITE  
ATTENTION  
Risque d’électrocution  
Ne pas ouvrir  
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.  
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…  
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.  
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.  
16. Dommages nécessitant réparation - Lenceinte 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.  
Lenceinte a été exposée à la pluie.  
Lenceinte ne semble pas fonctionner normalement ou indique un changement de performance.  
Lenceinte est tombée par terre ou a été endommagée.  
17. Entretien - Lutilisateur 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.  
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WICHTIGESICHERHEITSHINWEISE  
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.  
Alle anderweitigen Servicemaßnahmen von qualifiziertem Wartungspersonal durchführen lassen.  
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Congratulations!  
CongratulationsonyourpurchaseofaVelodynesubwoofersystem.This  
systemrepresentstheabsolutestateoftheartinaccuratelowfrequency  
reproduction.Webelievethistobethefinestsubwooferavailableanywhere!  
In this new subwoofer, we have combined our radical new driver and  
amplifierdesignstoobtainourtraditionallyaccuratesoundwhileincreasing  
efficiencyandoutputtonewstandards.Thisexceptionalsubwooferwill  
provideyouwithyearsofunparalleledlisteningpleasure.Enjoy!  
Caution!  
Pleaseobservethefollowinginstructionstoinsuresafeandpropersystem  
operation.  
Note: Do not move unit while turned on or plugged in!!! Do not  
leaveunitindirectsunlightoruseinhighhumidityenvironments!!!  
Warning!  
Topreventfireorshockhazard,donotexposethisequipmenttorainor  
moisture.Toavoidelectricalshock,donotopenspeakerenclosureoramp  
chassiscover.Pleaseobserveallwarningsontheequipmentitself.There  
arenouserserviceablepartsinside.Pleasereferallservicequestionsto  
yourauthorizedVelodynedealer.  
Priortoinstallation  
Pleaseunpackthesystemcarefully!Thisunitisextremelyheavy. Use  
cautionwhenliftingofmovingtoavoidinjury.Removeallstaplesusedto  
sealthecartonastheycanscratchthecabinet.Pleasesavethecartonand  
allpackagingmaterialsforfutureuse.Packingthisunitinanyothercarton  
may result in severe damage when shipping. Please take a moment to  
record the serial number and date/location of purchase in the space  
providedonthewarrantycardforfuturereference.  
continued. . .  
1
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Product Features and Controls  
• 15"(12.7"pistondiameter)subwooferwithtandem3"voicecoilsand  
220oz.magnet  
• Built-in1250watt(RMS)highefficiencyclassDamplifier  
• Accelerometerbasedservocontrolsystemforextremeaccuracy  
• Adjustable(40to120Hz)low-passcrossover(defeatable)  
• Selectable(80or100Hz)high-passcrossoveroutputs  
• Balanced(XLR)inputs  
• Line-level(RCA)inputs&outputs  
• Speaker-levelinputsandoutputswith5waybindingpostconnections  
• Signalsensingautoturnon/off(defeatable)  
• Variablevolumecontrol  
• Selectablephasecontrol(0 or180°)  
°
• Selectablesubsonicfilter(15Hzor35Hz)  
• Frequencyresponseof18-120Hz  
• Detachablepowercord  
• Magneticallyshieldedforvideouse  
• Multiplestaggeredlow-passcrossovers;12dB/octaveinitial,  
48dB/octaveultimate  
• Gaincompressioncircuitpreventsoverexcursionandampclipping  
• Externalremoteconnectorforcustominstallation  
• Poweron  
• Multi-layerresinlaminatecone  
• High-excursionrubbersurround  
2
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Installation  
YournewVelodyneservosubwooferprovidesforanumberofinstallation  
options.Readalltheinstallationinformationbelowinordertodetermine  
whichinstallationoptionisbestforyoursystem.Remembertoperform  
all installation procedures with system power turned off!!!  
Inputs  
Yournewsubwooferisequippedwithspeaker-level,line-levelandbalanced(XLR)  
inputs.UsetheLINELEVELjackswhenconnectingyoursubwoofertoapre-amp,  
signalprocessor,line-levelcrossover,orreceiverwithpre-ampleveloutputs.The  
SPEAKERLEVELjacksconnectdirectlytothespeakeroutputsofanyamplifier,  
integratedamplifierorreceiver.Youramplifiersectionwillnoticenoadditional  
loadingeffectswhenyouusetheseinputsduetotheirveryhighimpedance.  
Important!!!  
DonotusebothLINELEVELandSPEAKERLEVELconnectionssimultaneously!  
Volumecontrol  
This control allows you to balance the output from the subwoofer to the main  
speakers/amplifierinyoursystem.Thiscontrolshouldbesettoachievesimilar  
outputlevelfromboththemainspeakersandsubwooferwhenlisteningtomusic.  
Theremotemaythenbeusedforminute/temporaryadjustments,suchasincreasing  
thevolumeforhometheaterusage.  
Low-passcrossover-40to120Hz  
Allinputssumtheleftandrightchannelstogether,withtheresultingsignalpassing  
throughanadjustablelow-passcrossoverbeforebeingamplified.Thecrossover  
controlallowsyoutoadjusttheupperlimitofthesubwoofer'sfrequencyresponse  
from 40 to 120Hz. The subwoofer's response will begin rolling off above the  
frequencyyousetthiscontrolto.Youshouldsetthecrossoverfrequencytoobtain  
asmoothandseamlesstransitionfromthesubwoofertothemainspeakersinyour  
system.Ifyourmainspeakersaresmallerunitswithlimitedlowfrequencyoutput,  
youmaywishtochooseahigherfrequency(suchas100-120Hz)thanyouwould  
withlargerspeakerswhichhavegreaterlowfrequencyoutput.Withlargerspeakers,  
youmightstartwiththiscontrolsetlower,suchas80Hz.  
continued. . .  
3
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Abypassswitchisalsoprovidedifyouwishtouseanexternalcrossover.  
If you are not using an external crossover, we recommend that you  
use the one provided within the unit for optimum performance!  
Phaseadjustment-0°/180°  
Thiscontrolallowsyouthe"reverse"thephaseofthesubwoofer'soutputsignal  
180°tocorrectforanypossiblemismatchandresultingcancellationbetweenthe  
subwooferandyourmainspeakers/amplifier.Toadjust,simplylistentothesystem  
withmusicplaying.Thenmovetheswitchfromonepositiontotheotherandlisten  
forachangeinlowfrequencyoutput.Thecorrectpositionwillhaveagreateramount  
ofapparentlowfrequencyoutput.  
Subsonic-15Hz(THX)/35Hz  
Thisadjustmentaltersthelowfrequencylimitofthesubwoofer.Formostsystems  
we recommend the 15Hz setting which will allow the subwoofer to deliver the  
maximumlowbassoutputitwasdesignedfor.Incertainmovietheaterinstallations  
whichsuggestthattheextremelowbassbelimited,movetheswitchpositionto35Hz  
andtheresponsewillbeattenuatedbelowthisfrequency.  
Crossoverswitch-In/Out(THX)  
Thisswitchallowstheelectroniccrossovercircuitrytoberemovedfromthe  
signalpath.Thisisrequiredincertaininstallationswhichroutethesignal  
throughexternalprocessorswithacrossovercircuitoftheirown,suchas  
thenewdigitalunits.SimplymovetheswitchtoOUTtodisengagethebuilt  
in crossover. For all other installations which do not have a separate  
electroniccrossoverwerecommendyouleavetheinternalcrossoverIN  
toprovideoptimumperformance.  
Autoturnonfunction  
Withthisfunctioninthe"auto"position,yoursubwoofer canbesafelyleft  
withthemainpowerswitchoncontinuously.Thesubwooferwillturnitself  
onautomaticallywhenanaudiosignalispresent.Ifnosignalispresentfor  
approximately15minutes,theunitwillswitchtostandbymode.Whilein  
standymode,yoursubwooferwilldrawveryminimalpower.Thisfunction  
canbedisabledbyleavingtheswitchinthe"on"position.  
4
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Externalremotejack  
Thisconnectionallowsanauxiliaryinfraredremotereceiver"eye"tobeinstalledand  
placed where most convenient. This option is usually only required when the  
subwooferistobepartofacustominstallationinwhichthebuiltin"eye"(located  
adjacenttothespeakeronthefrontbaffle)willbehiddeninalocationwhereitcan  
notadequatelyreceivesignalsfromtheremote.  
Highpasscrossover switch-80Hz (THX)/100Hz  
This switch selects the frequency for the high pass crossover outputs. This  
crossoverisfunctionalonbothlineandspeaker-leveloutputs.Smallerspeakerswith  
limitedlowfrequencyabilitymaypreferthehigher100Hzsettingwhichwillreduce  
thelowfrequenciessenttothem.Largerspeakerswithgreaterlowfrequencyoutput  
maybeabletohandlethe80Hzsettingwithoutstrain.  
Powerswitch  
Themasterpowerswitchislocatedontherighthalfoftheunit.Thisrockerstyle  
switchisthemainon/offfortheunit.Thisswitchshouldbesettoposition 1(up)  
foron,and0(down)foroff.Iftheunitistobeleftunusedforanextendedperiodof  
time,themasterpowerswitchshouldbeturnedoff.  
Detachablepowercord  
Allowsforeasyreplacementshouldtheoriginalbedamaged.  
Line-Level Connection  
Figure1showsconnectiontoapre-amplifier'smainoutputsandreturning  
themtoyouramplifierinputs.  
Wheninstalledinthisfashion,yoursatellitespeakerswillbecrossedoverat80/  
100Hzwhichremovesthelowerbassfromyouramplifierandspeakers,enablingthem  
todoabetterjobreproducinghighfrequencies.Byutilizingthismethod,youwill  
haveabi-amplifiedsystem,gainingimprovedpowerandheadroomforyoursystem.  
THXUltra2Operation:  
OnthebackpanelofthesubwooferselecttheTHXSubwoofervolume  
levelandtheSubsonic,X-Over,andHigh-PassCrossoverTHXsettings.  
continued. . .  
5
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Figure 1: Installation Using Line-Level Inputs  
AMPLIFIER  
PRE-AMP  
MAIN INPUTS  
MAIN OUTPUTS  
MAIN OUTPUTS  
RIGHT LEFT  
LEFT RIGHT  
RIGHT  
LEFT  
TOSATELLITESPEAKERS  
Subwooferoutputs  
TheVelodynesubwooferisdesignedtooperateusingthefullrangeaudiosignal  
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  
conventionalamplifierandspeaker.Insomerarecases,combiningbothanexternal  
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  
crossoverineithertheprocessororVelodynesubwoofer.Insomeinstallations,  
simplysettingonecrossovertoahigherfrequency(suchas120Hz)willrestore  
maximumperformance.Tobypassthesubwoofer'sinternalcrossoverwhentheunit  
is being fed a low pass signal from another crossover, simply locate the switch  
markedX-over,OUT-INontherearpanelofthesubwooferandsettotheOUT  
position.Thiswilleliminatetheinternalcrossoverfromthesignalpath. Note:Ifnot  
usinganexternalperformance.  
6
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Speaker-Level Connection  
Figure2showsaneasywaytoconnectyourVelodynesubwooferdirectlytoyour  
receiverorintegratedamplifier. Whenconnectedinthisfashion,yoursatellite  
speakerswillbecrossedoverat80/100Hz,whichremovesthelowerbassfromyour  
speakers,enablingthemtodoabetterjobreproducinghighfrequencies.Youmay  
alsoconnectyoursatellitesdirectlytoyourreceiveroramplifieralongwiththe  
subwooferifyouwishtobypasstheinternalhigh-passcrossover.  
Caution!!! Toavoiddamagetoyourmainamplifier,besuretomaintaincorrect  
polaritywhenmakingallconnections.Red(positive)tored,andblack(negative)  
toblack.Besurethatallconnectionsaretight,andthattherearenoloosestrands  
orfrayedwires.  
Figure 2: Installation Using Speaker-Level (from amplifier) Inputs  
MAINOUTPUTS  
(speaker-level)  
SATELLITESPEAKERS  
INTEGRATEDAMP/RECEIVER  
7
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Interconnect Cables  
WheninstallingyournewVelodynesubwooferusingthelinelevelconnections,  
you should always use shielded phono cables. There are many decent cables  
availabletoday,mostanyofwhichwillworkperfectlywell.Wedorecommendthat  
you keep the length of cable as short as possible to avoid any potential noise  
problems.  
When using speaker level connections, use a decent quality speaker cable that  
mateswellwiththeconnectors.Beverycarefultoavoidanyloosestrandsorfrayed  
wireswhichmayresultinashort,whichmaydamageyourequipment.Cablesof  
extremelylargesizearetypicallynotrequired.Extremelylargegaugewiremaynot  
properlyfitinthebindingposts,resultinginapoorconnectionandpossibleshort  
circuits.  
Placement  
Truesubwoofersoperateatextremelylowfrequencieswhichareprimarilynon-  
directional.Whileitisrecommendedthatthesubwooferbeplacedonthesameplane  
asthesatellitespeakers,roomandsystemconditionsoftendictateotherwise.Keep  
inmindthatfrequencyresponseandoutputlevelcanbedrasticallyinfluencedby  
placement,dependingontheacousticpropertiesofthelisteningroom.Typically,  
theoptimumlocationforasubwooferistuckedawayinacornerofyourlistening  
room.Thislocationwillusuallyofferthegreatestoutputlevelsandoptimumlow  
frequencyextension.Theworstlocationforasubwooferittypicallyfarawayfrom  
anywalls,andclosetothecenterofyourroom.Avoidtheselocationswhenpossible.  
WhenusingapairofVelodynesubwoofersinstereo,itispreferabletoplaceeach  
subwooferbythesatelliteofthesamechannel.  
Caution! Thissubwooferhaselectronicsbuiltintothecabinet.Donotplacethe  
cabinetnexttosourcesofheatsuchasfurnaceregisters,radiators,etc.Donot  
placetheunitnearsourcesofexcessivemoisture,suchasevaporativecoolers,  
humidifiers,etc.Thepowercordshouldberoutedinsuchawaythatitwillnot  
bewalkedon,pinched,orcompressedinanywaythatcouldresultindamaging  
theinsulationorwire.  
8
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RegardlessofwhereyouinstallyourVelodynesubwoofer,itmustremain  
inanuprightposition(wooferfacingforward).Using,shipping,orotherwise  
storingthesubwooferinanyotherpositionforanextendedperiodoftime  
mayresultindamagetotheunitnotcoveredbywarranty.  
The subwooferismagneticallyshieldedtoreducetheamountofstray  
magneticenergyemittedfromthespeaker'smotorstructure.Thisgreatly  
increasesflexibilitywhenplacingtheunitclosetovideomonitorsasthere  
isverylittlestraymagnetism.However,thisshieldingmaynotbeadequate  
incertainextremelysensitiveinstallations.Certaintypesoftelevisions  
areparticularlysensitivetostraymagneticfields.Ifyourtelevisionproduces  
distortedcolorsafterinstallingyoursubwoofer,simplyincreasethedistance  
betweenyourtelevisionandthesubwoofer,untilnormalcolorandoperation  
isreturned.  
Protection Circuitry  
Your new subwoofer is equipped with special protection circuitry to  
providemaximumperformancewithgreatestreliability.  
Theunitisprotectedagainst:  
1) Overdrivingthespeakeroramplifier.  
2) Overheatingtheamplifier.  
3) Excessivedropinpowerlinevoltage.  
Thefirsttypeofprotectioncircuitrywhichpreventsoverdrivingofthe  
speakeroramplifieroperatesconstantlywithoutbeingaudibleundermost  
situations.Insomeextremesituations(sustainedhighoutputlevelssuchas  
prosoundusage),theunitmayshutdownmomentarily.Thebluepowerled  
mayalsoblinkrapidly.Thisindicatesoperationofthethermalorundervoltage  
protectioncircuitry.Ifthisshouldhappen,youshouldreducethevolume  
settingorshuttheunitoffuntilnormaloperatingconditionsreturn.Youmay  
alsowanttoplugtheunitintoadifferentwalloutlet,asdroppingpowerline  
voltagewillbemostnoticeableunderstrenuousconditions.  
continued. . .  
9
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Distortion in Loudspeakers  
Nonlineardistortionisaproblemwhichplaguesallspeakers.Thisparticulartype  
ofdistortionisacommonprobleminsubwoofers,whichmustmovelargeamounts  
ofairtoproduceadequatelevelsofdeepbass.Nonlineardistortionisdefinedasany  
form of distortion that moves energy from one portion of the audio frequency  
spectrumtoanother.Whenasingletoneisappliedtoanonlinearsystem,theresult  
isharmonicdistortion.Inwhichsomeoftheenergyleavesthesystematmultiples  
oftheoriginalfrequency.Whenmultipletonesareapplied,intermodulationtones  
areproduced,usuallyassimplecombinationsoftheinputfrequencies.Generally,  
3%distortionisconsideredareasonableamountforspeakers.Thismeansthat3%  
ofthetotalenergyleavingthespeakerisatfrequenciesotherthantheintendedinput  
signal.  
Most subwoofers on the market today however, produce much more than 3%  
distortionatcommonlisteninglevels.Manymodelswehavetestedproducegreater  
than20%distortion@20Hzwhendrivento100dB.Thisisatypicaloutputlevel  
obtainedinmanysystems,particularlyhometheatersystems.Evenat1watt,many  
conventionalunitsproduceseveralpercentdistortion.Secondly,theoddorder,  
higherharmonicsaremuchmoreoffensivetothehumanearthanthecloser2nd  
harmonic.  
Aninterestingresultofthisreduceddistortionisthatsomeofthebass,whenplayed  
overanextremelyaccuratesubwoofersystem,seemstoactuallybemissing.The  
truth,however,isthatthe"missing"basswasnevertheretobeginwith!Distortion  
products of conventional woofers actually add to the bass spectrum making it  
appearlouderthanrecorded.Thisisduetotheadditionalandunwantedharmonics  
(distortion)ofthefundamentalsignal.Whileconventionalsubwoofersofferlittle  
tocombatdistortionproducts,weatVelodynehavedevelopedanotherway...  
The Velodyne Servo-Control Solution  
YourVelodyneHGSXsubwooferproducessoundinthesamemannerasconventional  
loudspeakers:acone-shapedpistonisforcedtomovebymeansofalinearmotor.  
However,thisisabouttheonlyconventionalpartofthesubwoofer.  
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Wedeterminedthatconventionalmotorsareunacceptablewhencalled  
upontoproducetheamountoflinearmotionwedesired.Thisinadequacy  
ledustodesignanimprovedmotorstructurebyincorporatingtwocoils,  
operatingoutofphaseinapush-pullconfigurationwithintwomagneticgaps  
andsuspendedbydualspidersforevengreaterlinearity.Wedesignedthis  
motortoproduceoverone inch(1-1/8"tobeexact)oflinearmotion,with  
amaximummechanicallimitof2".Also,withthisuniqueconfiguration,the  
distortionproductsarereducedbyafactoroftwooverconventionalsingle  
coilstructureswithdramaticallyimprovedconecontrol.Thisdriveralone  
wouldresultinlessdistortionthananyothernonservodesign.Wealso  
designedthismotortobemagneticallyshieldedfromthestart,allowfor  
convenientplacementnearthetelevisionmonitorsofhometheatersystems.  
Theuniquepush-pulltwinvoicecoilinthesesubwoofersisdesignedandbuiltin-  
houseonacustombuiltNCcoilwindingmachine.Thisuniquemachinewindsthis  
coilinawaylikenoneother.Therearetwocoils,eachwithtwolayers,wouldonthe  
sameformer.Twolayersarefirstwoundinsidetheformerandthentwolayerson  
theoutside.Thisresultsinincreasedheatdissipationovernormaldesignswhich  
simplypileaddedlayersontopofeachother,buryingseverallayersbeneaththe  
surface.WethenutilizedmaterialssuchasPolyimideresinimpregnatedfiberglass,  
for the former. This material is capable of withstan- ding the extremely high  
temperatures(320degreesC)thatcanoccurwhendrivenbyourpowerfulamplifiers.  
Thisresultsinexcellentlong-termpowerhandlingcapabilities.  
ThesespeakersalsofeatureournewMulti-LayerResinLaminatecone  
system.Thisnewconestartswithtwo-layersofreinforcedpulpfiber,which  
arethenheatpressedwithabindingresintoformanextremelyrigidcone  
structure. This helps to reduce distortion by decreasing cone flex and  
breakup.Attachedtotheedgeoftheconeisournewlydesignedrubber  
surround,tailoredforlonglifeunderthehighexcursionstheseunitsare  
capableof.  
As in our other servo products, we then incorporated closed-loop  
accelerometerbasedservo-controloftheloudspeaker.Attheheartofthis  
controlsystemisalowmassaccelerometerrigidlyattachedtothevoice  
coil.Theaccelerometercontinuouslymonitorsconemotions,providingus  
continued. . .  
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withafeedbacksignalfortheservocontrolcircuitry. Thishigh-gainsystemis  
designedtoimprovelinearityandreducedistortionapproximately30timesover  
conventionalnon-servosystems.Whiletheinputsignalisbeingsenttotheamplifier  
whichpowersthedriver,acontinuoussignalrepresentingconemotionisbeingsent  
toacomparatorcircuit.Thiscircuitconstantlyadjustsforanydeviationbetween  
theinputsignalandthesubwoofer'soutput.Thisselfregulationresultsinextreme  
controloverconemovement,andveryaccuratelowdistortionsound.  
Toprovidethepowerfordrivingthismassiveloudspeaker,weincorporated  
anextremelyefficientClassDswitchingamplifier.Onethatiscapableof  
runningcooltothetouchandproviding1250watts(RMS)and3000watts  
peak power! At typical listening levels, the HGS-15X THX Ultra 2  
produceslessthan0.5%harmonicdistortionwithinputsignalsextending  
to20Hzandbelow. Evenattheirmaximumoutputlevel,thedistortion  
barelyexceeds1%,far betterthananyconventionaldesigncurrentlyonthe  
market.Thiscombinationprovidesyouwiththebestcombinationofclean,  
deep,accuratebass,withoutmakinganysacrificetodistortion.  
Care of Your Subwoofer  
Do not use any harsh detergents or chemicals to clean the cabinet.  
Abrasives,detergents,orcleaningsolutionsmaydamagethefinishonthe  
cabinet.Werecommendusingadampclothtocleanthecabinet.During  
normal conditions, your new subwoofer may be left on continuously  
withoutanyproblems.Theunitisequippedwithasignal-sensingturnon/  
offthatwillautomaticallyturnontheunitwhenasignalispresentattheinputs  
andturnoff theunitafterseveralminuteswhenthereisnolongeranysignal  
attheinputs.Ifyouplantoleavethesubwooferunusedforanextended  
periodoftime,werecommendthatyouturnoffthemasterpowerswitch  
ontherearpanel.  
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Troubleshooting and Service  
Ifyoushouldexperienceaproblemwiththeoperationofyoursubwoofer,  
pleasecheckallofthefollowingbeforeseekingservice.Followingisa  
simpletroubleshootingguidetoassistyou.  
1. Verifyunitispluggedinandpoweroutletusedisactive.  
2. Ispowerswitchon?  
3. Isautoturnon/offsetproperly?  
4. Isunitreceivinganinputsignalfromyoursource?  
5. Haveallcontrolsonsubwoofer(volume,crossover,phase,etc.)beenproperly  
set?  
6. Isthemuteontheremotecontrolengaged?  
7. Arebothvolumecontrolsproperlyset?  
8. Ifunithasbeenrunningathighlevelsforanextendedperiodoftime,oneofthe  
protectioncircuitsmaybeengaged.  
• Hasthebuilt-inamplifieroverheated?  
• Isyourpowerlinevoltagesaggingunderheavyuse?  
If the protection circuitry is active, the unit may cycle on and off until  
operating parameters return to normal. Protection circuit operation is  
usuallyindicatedbyablinkingpowerLED.Undermoreseriousconditions,  
theunitmayshutoffcompletely.Normaloperationwillreturnuponcooling,  
butyoumayberequiredtoturnthepoweroffandthenonagaintoreset  
theunit.  
Thefollowingconditionsrequireservicebyaqualifiedtechnician:  
1. Thepowercordhasbecomedamaged.  
2. Theunitdoesnotappeartooperatenormallyorexhibitsamarkedchangein  
performance.  
3. Theunithasbeenexposedtowater.  
4. Somepartofthecabinetorcircuitryisphysicallydamaged.  
Thank you for purchasing a Velodyne!  
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SPECIFICATIONS  
Cabinet(H/W/D)  
HGS-15XTHXUltra2  
19.75"x18"x17-7/8"  
(49x45x45cm)  
FrequencyResponse  
HarmonicDistortion  
SubsonicFilter  
18Hz-120Hz+/-3dB  
lessthan.5%  
15Hzor35Hz  
HighPassCrossover  
LowPassCrossover  
80Hzor100Hz(6dB/octave)  
40Hz-120Hz  
(12dB/octaveinitial,48dB/octaveultimate)  
0°/180°  
Phase  
Amplifier  
Woofer-forwardfiring  
Magnet  
ClassD,1250wattsRMS,3000wattspeak  
15" (12.7"pistondiameter)  
220oz. (13.7lbs.)  
MagnetStructure  
VoiceCoil  
Inputs  
Outputs  
Warranty  
380oz. (24lbs.)  
Tandem3"push-pull  
Line-level,Balancedandspeaker-level  
Line-levelandspeaker-level  
Twoyears(partsandlabor)  
95lbs.(approx.) (43Kg)  
Weight  
Specifications are subject to change without notice.  
FOR YOUR RECORDS. . .  
DATEPURCHASED _______________________________________  
DEALER _________________________________________________  
SERIAL# ________________________________________________  
*NOTE: Please complete and return your warranty card within ten (10) days or  
Register. . . ON LINE . . .It's faster . . . and easier  
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Installation Worksheet  
Date: _____________  
Model/Serial # ________________  
Installed by: ____________________ Phone: _______________  
Volume Setting: ____________ Output Level (dB): _________  
Low Pass X-Over: _________ Hz Phase Pos.: 0°________  
180°________  
HighPassX-Over: 80Hz_________  
100Hz_________  
SubSonic: 15Hz_________  
35Hz_________  
OutputLevels:(Speakers)  
LeftFront:_________dB  
LeftRear: _________dB  
RightFront:_________dB  
RightRear: _________dB  
Center:_________dB  
Other Velodyne Subwoofer Products:  
CHTSeries  
SPLSeriesII  
CHT-8  
CHT-10  
CHT-12  
SPL-800SeriesII  
SPL-1000SeriesII  
SPL-1200SeriesII  
SPL-523Satellites  
CHT-15  
CHT Front Row System  
DigitalDriveSeries  
DD-10  
VX-10  
DD-12  
DD-15THXUltra2  
DD-18THXUltra2  
DLSSeries  
DLS-3500  
DLS-3750  
DLS-4000  
Signature1812  
DecoSystem  
Deco System  
Deco Satellites  
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“Not only was the little Velodyne the best small sub I’ve ever used, it was  
one of the very best subs I’ve used.”  
-John Potis  
SoundStage!, April 2002  
“The SPL-1200 was able to hit an impressively deep 16 Hz”.  
-Tom Noussaine  
Sound & Vision, June 2001  
“How do they get this kind of bass out of such a tiny box? Deep, tight, tuneful  
and loud enough to rattle pictures on the wall—this is serious subwoofing.”  
-Robert Deutsch  
Stereophile Guide to HomeTheater, September 1998  
Velodyne Acoustics, Inc.  
345 Digital Drive  
Morgan Hill, CA 95037  
408.465.2800 voice  
408.779.9227 fax  
Service E-mail: [email protected]  
Product E-mail: [email protected]  
Technical E-mail: [email protected]  
Printed on recycled paper.  
10-03, #63-HGS15X RevA  
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