Hughes & Kettner VX User Manual

VX Power Amps

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Manual 1.2

Important Safety Instructions

Before connecting, read instructions

Important Advice on Safety!

Please read before use and keep for later use!

Wichtige Sicherheitshinweise!

Bitte vor Gebrauch lesen und für späteren Gebrauch
aufbewahren!

• Read all of these instructions!

• Save these instructions for later use!

•Follow all warnings and instructions marked on the product!

• Do not use this product near water, i.e. bathtub, sink, swimming pool, wet
basement, etc.

• Do not place this product on an unstable cart, stand or table. The product may
fall, causing serious damage to the product or to persons!

• Slots and openings in the cabinet and the back or bottom are provided for ven­tilation; to ensure reliable operation of the product and to protect it from
overheating, these openings must not be blocked or covered. This product
should not be placed in a built-in installation unless proper ventilation is provi­ded.

• This product should not be placed near a source of heat such as a stove,
radiator, or another heat producing amplifier.

• Use only the supplied power supply or power cord. If you are not sure of the
type of power available, consult your dealer or local power company.

• Do not allow anything to rest on the power cord. Do not locate this product
where persons will walk on the cord.

• Never break off the ground pin on the power supply cord.

• Power supply cords should always be handled carefully. Periodically check cords
for cuts or sign of stress, especially at the plug and the point where the cord
exits the unit.

• The power supply cord should be unplugged when the unit is to be unused for
long periods of time.

• If this product is to be mounted in an equipment rack, rear support should be
provided.

• This product should be used only with a cart or stand that is recommended by
HK AUDIO®.

• Never push objects of any kind into this product through cabinet slots as they
may touch dangerous voltage points or short out parts that could result in risk
of fire or electric shock. Never spill liquid of any kind on the product.

• Do not attempt to service this product yourself, as opening or removing covers
may expose you to dangerous voltage points or other risks. Refer all servicing
to qualified service personnel.

• Unplug this product from the wall outlet and refer servicing to qualified service
personnel under the following conditions:

• When the power cord or plug is damaged or frayed.

• If liquid has been spilled into the product.

• If the product has been exposed to rain or water.

• If the product does not operate normally when the operating instructions are
followed.

• If the product has been dropped or the cabinet has been damaged.

• If the product exhibits a distinct change in performance, indicating a need of
service!

• Adjust only these controls that are covered by the operating instructions since
improper adjustment of other controls may result in damage and will often
require extensive work by a qualified technician to restore the product to
normal operation.

• Exposure to extremely high noise levels may cause a permanent hearing loss.

• Individuals vary considerably in susceptibility to noise induced hearig loss, but
nearly everyone will lose some hearing if exposed to sufficiently intense noise
for a sufficient time. The U.S. Government´s Occupational Safety and Health
Administration (OSHA) has specified the following permissible noise level
exposures:

Duration Per Day In Hours Sound LeveldBA, Slow Response

890
692
495
397
2 100
11/2 102
1 105
1/2 110
1/4 or less 115

• According to OSHA, any exposure in excess of the above permissible limits
could result in some hearing loss.

• Ear plug protectors in the ear canals or over the ears must be worn when
operating this amplification system in order to prevent a permanent hearing
loss if exposure is in excess of the limits as set forth above. To ensure against
potentially dangerous exposure to high sound pressure levels, it is recommen­ded that all persons exposed to equipment capable of producing high sound
pressure levels such as this amplification system be protected by hearing
protectors while this unit is in operation.

•Fuses: Replace with IEC 127 (5x 20 mms) type and rated fuse for best perfor­mance only.

TO PREVENT THE RISK OF FIRE AND SHOCK HAZARD, DO NOT EXPOSE
THIS APPLIANCE TO MOISTURE OR RAIN. DO NOT OPEN CASE;
NO USER SERVICE-ABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

• The unit has been built by HK AUDIO®in accordance with IEC 60065 and left
the factory in safe working order. To maintain this condition and ensure non-risk
operation, the user must follow the advice and warning comments found in the
operating instructions. The unit conforms to Protection Class 1 (protectively
earthed).

•HK AUDIO®ONLY GUARANTEE THE SAFETY, RELIABILITY AND EFFICIENCY
OF THE UNIT IF:

• Assembly, extension, re-adjustment, modifications or repairs are carried out by
HK AUDIO®or by persons authorized to do so.

• The electrical installation of the relevant area complies with the requirements
of IEC (ANSI) specifications.

• The unit is used in accordance with the operating instructions.

• The unit is regularly checked and tested for electrical safety by a competent
technician.

WARNING:

• If covers are opened or sections of casing are removed, except where this can
be done manually, live parts can become exposed.

• If it is necessary to open the unit this must be isolated from all power sources.
Please take this into account before carrying out adjustments, maintenance,
repairs and before replacing parts.

• Adjustment, maintenance and repairs carried out when the unit has been ope­ned and is still live may only be performed by specialist personnel who are aut­horized by the manufacturer (in accordance with VBG 4) and who are aware of
the associated hazards.

• Loudspeaker outputs which have the IEC 417/5036 symbol (Diagram 1, below)
can carry voltages which are hazardous if they are made contact with. Before
the unit is switched on, the loudspeaker should therefore only be connected
using the lead recommended by the manufacturer.

• Where possible, all plugs on connection cables must be screwed or locked onto
the casing.

• Replace with IEC 127 (5x 20 mms) type and rated fuse for best performance
only.

• It is not permitted to use repaired fuses or to short-circuit the fuse holder.

• Never interrupt the protective conductor connection.

• Surfaces which are equipped with the "HOT" mark (Diagram 2, below), rear
panels or covers with cooling slits, cooling bodies and their covers, as well as
tubes and their covers are purposely designed to dissipate high temperatures
and should therefore not be touched.

• High loudspeaker levels can cause permanent hearing damage. You should
therefore avoid the direct vicinity of loudspeakers operating at high levels.
Wear hearing protection if continuously exposed to high levels.

MAINS CONNECTION:

• The unit is designed for continuous operation.

• The set operating voltage must match the local mains supply voltage.

• The unit is connected to the mains via the supplied power unit or power cable.

• Power unit: Never use a damaged connection lead. Any damage must be
rectified by a competent technician.

•Avoid connection to the mains supply in distributor boxes together with several
other power consumers.

• The plug socket for the power supply must be positioned near the unit and
must be easily accessible.

PLACE OF INSTALLATION:

• The unit should stand only on a clean, horizontal working surface.

• The unit must not be exposed to vibrations during operation.

• Keep away from moisture and dust where possible.

• Do not place the unit near water, baths, wash basins, kitchen sinks, wet areas,
swimming pools or damp rooms. Do not place objects containing liquid on the
unit - vases, glasses, bottles etc.

• Ensure that the unit is well ventilated.

• Any ventilation openings must never be blocked or covered. The unit must be
positioned at least 20 cm away from walls. The unit may only be fitted in a rack
if adequate ventilation is ensured and if the manufacturer's installation
instructions are followed.

• Keep away from direct sunlight and the immediate vicinity of heating elements
and radiant heaters or similar devices.

• If the unit is suddenly moved from a cold to a warm location, condensation can
form inside it. This must be taken into account particularly in the case of tube
units. Before switching on, wait until the unit has reached room temperature.

• Accessories: Do not place the unit on an unsteady trolley, stand, tripod, base or
table. If the unit falls down, it can cause personal injury and itself become
damaged. Use the unit only with the trolley, rack stand, tripod or base recom­mended by the manufacturer or purchased together with the unit. When setting
the unit up, all the manufacturer's instructions must be followed and the setup
accessories recommended by the manufacturer must be used. Any combination
of unit and stand must be moved carefully. A sudden stop, excessive use of force
and uneven floors can cause the combination of unit and stand to tip over.

• Additional equipment: Never use additional equipment which has not been
recommended by the manufacturer as this can cause accidents.

•To protect the unit during bad weather or when left unattended for prolonged
periods, the mains plug should be disconnected. This prevents the unit being
damaged by lightning and power surges in the AC mains supply.

Diagram 1 Diagram 2

•Das Gerät wurde von HK AUDIO®gemäß IEC 60065 gebaut und hat das Werk
in sicherheitstechnisch einwandfreiem Zustand verlassen. Um diesen Zustand
zu erhalten und einen gefahrlosen Betrieb sicherzustellen, muss der Anwender
die Hinweise und die Warnvermerke beachten, die in der Bedienungsanleitung
enthalten sind. Das Gerät entspricht der Schutzklasse I (schutzgeerdet).

• DIE SICHERHEIT, ZUVERLÄSSIGKEIT UND LEISTUNG DES GERÄTES WIRD
VON HK AUDIO®NUR DANN GEWÄHRLEISTET, WENN:

• Montage, Erweiterung, Neueinstellung, Änderungen oder Reparaturen von
HK AUDIO®oder von dazu ermächtigten Personen ausgeführt werden.

• die elektrische Installation des betreffenden Raumes den Anforderungen von
IEC (ANSI)-Festlegungen entspricht.

• das Gerät in Übereinstimmung mit der Gebrauchsanweisung verwendet wird.

WARNUNG:

•Wenn Abdeckungen geöffnet oder Gehäuseteile entfernt werden, außer wenn
dies von Hand möglich ist, können Teile freigelegt werden, die Spannung führen.

•Wenn ein Öffnen des Gerätes erforderlich ist, muss das Gerät von allen Span­nungsquellen getrennt sein. Berücksichtigen Sie dies vor dem Abgleich, vor
einer Wartung, vor einer Instandsetzung und vor einem Austausch von Teilen.

• Ein Abgleich, eine Wartung oder eine Reparatur am geöffneten Gerät unter
Spannung darf nur durch eine vom Hersteller autorisierte Fachkraft (nach VBG

4) geschehen, die mit den verbundenen Gefahren vertraut ist.

• Lautsprecher-Ausgänge, die mit dem IEC 417/5036-Zeichen (Abb.1, s.unten)
versehen sind können berührungsgefährliche Spannungen führen. Deshalb vor
dem Einschalten des Gerätes Verbindung nur mit dem vom Hersteller empfoh­lenen Anschlusskabel zum Lautsprecher herstellen.

• Alle Stecker an Verbindungskabeln müssen mit dem Gehäuse verschraubt oder
verriegelt sein, sofern möglich.

• Es dürfen nur Sicherungen vom angegebenen Typ und der angegebenen Nenn­stromstärke als Ersatz verwendet werden.

• Eine Verwendung von geflickten Sicherungen oder Kurzschließen des Halters
ist unzulässig.

• Niemals die Schutzleiterverbindung unterbrechen.

• Oberflächen, die mit dem "HOT"-Zeichen (Abb.2, s.unten) versehen sind,
Rückwände oder Abdeckungen mit Kühlschlitzen, Kühlkörper und deren Ab­deckungen, sowie Röhren und deren Abdeckungen können im Betrieb erhöhte
Temperaturen annehmen und sollten deshalb nicht berührt werden.

• Hohe Lautstärkepegel können dauernde Gehörschäden verursachen.
Vermeiden Sie deshalb die direkte Nähe von Lautsprechern, die mit hohen
Pegeln betrieben werden. Verwenden Sie einen Gehörschutz bei dauernder
Einwirkung hoher Pegel.

NETZANSCHLUSS:

• Das Gerät ist für Dauerbetrieb ausgelegt.

• Die eingestellte Betriebsspannung muss mit der örtlichen Netzspannung übe­reinstimmen.

• Der Anschluss an das Stromnetz erfolgt mit dem mitgelieferten Netzteil oder
Netzkabel.

• Netzteil: Eine beschädigte Anschlussleitung kann nicht ersetzt werden.
Das Netzteil darf nicht mehr betrieben werden.

•Vermeiden Sie einen Anschluss an das Stromnetz in Verteilerdosen zusammen
mit vielen anderen Stromverbrauchern.

• Die Steckdose für die Stromversorgung muss nahe am Gerät angebracht und
leicht zugänglich sein.

AUFSTELLUNGSORT:

• Das Gerät sollte nur auf einer sauberen, waagerechten Arbeitsfläche stehen.

• Das Gerät darf während des Betriebs keinen Erschütterungen ausgesetzt sein.

•Feuchtigkeit und Staub sind nach Möglichkeit fernzuhalten.

• Das Gerät darf nicht in der Nähe von Wasser, Badewanne, Waschbecken,
Küchenspüle, Nassraum, Swimmingpool oder feuchten Räumen betrieben
werden. Keine mit Flüssigkeit gefüllten Gegenstände -Vase, Gläser, Flaschen
etc. auf das Gerät stellen.

• Sorgen Sie für ausreichende Belüftung der Geräte.

•Eventuelle Ventilationsöffnungen dürfen niemals blockiert oder abgedeckt
werden. Das Gerät muß mindestens 20 cm von Wänden entfernt aufgestellt
werden. Das Gerät darf nur dann in ein Rack eingebaut werden, wenn für
ausreichende Ventilation gesorgt ist und die Einbauanweisungen des Her­stellers eingehalten werden.

•Vermeiden Sie direkte Sonneneinstrahlung sowie die unmittelbare Nähe von
Heizkörpern und Heizstrahlern oder ähnlicher Geräte.

•Wenn das Gerät plötzlich von einem kalten an einen warmen Ort gebracht wird,
kann sich im Geräteinnern Kondensfeuchtigkeit bilden. Dies ist insbesondere
bei Röhrengeräten zu beachten. Vor dem Einschalten solange warten bis das
Gerät Raumtemperatur angenommen hat.

• Zubehör: Das Gerät nicht auf einen instabilen Wagen, Ständer, Dreifuß, Unter­satz oder Tisch stellen. Wenn das Gerät herunterfällt, kann es Personenschäden
verursachen und selbst beschädigt werden. Verwenden Sie das Gerät nur mit
einem vom Hersteller empfohlenen oder zusammen mit dem Gerät verkauften
Wagen, Rack, Ständer, Dreifuß oder Untersatz. Bei der Aufstellung des Gerätes
müssen die Anweisungen des Herstellers befolgt und muss das vom Hersteller
empfohlene Aufstellzubehör verwendet werden. Eine Kombination aus Gerät
und Gestell muss vorsichtigt bewegt werden. Plötzliches Anhalten, übermäßige
Kraftanwendung und ungleichmäßige Böden können das Umkippen der Kombi­nation aus Gerät und Gestell bewirken.

• Zusatzvorrichtungen: Verwenden Sie niemals Zusatzvorrichtungen, die nicht
vom Hersteller empfohlen wurden, weil dadurch Unfälle verursacht werden
können

• Zum Schutz des Gerätes bei Gewitter oder wenn es längere Zeit nicht beauf­sichtigt oder benutzt wird, sollte der Netzstecker gezogen werden.
Dies verhindert Schäden am Gerät aufgrund von Blitzschlag und Spannungs­stößen im Wechselstromnetz.

Abb.1 Abb.2

•

Conseils de Securite Importants!

Priere de lire avant l'emploi et a conserver pour uti­lisation ulterieure!

Importanti avvertimenti di sicurezza!

Leggere attentamente prima dell'uso e conservare per
un utilizzo successivo:

¡Indicaciones de seguridad importantes!

¡Léanse antes de utilizar el aparato y guardense para
so uso posterior!

L'appareil a été conçu par HK AUDIO®selon la norme IEC 60065 et a quitté l'ent-

reprise dans un état irréprochable. Afin de conserver cet état et d'assurer un
fonctionnement sans danger de l'appareil nous conseillons à l'utilisateur la lec­ture des indications de sécurité contenues dans le mode d'emploi. L'appareil
est conforme à la classification I (mise à terre de protection).

• SURETE, FIABILITE ET EFFICACITE DE L'APPAREIL NE SONT GARANTIS PAR
HK AUDIO®QUE SI:

• Montage, extension, nouveau réglage, modification ou réparation sont
effectués par HK AUDIO®ou par toute personne autorisée par HK AUDIO®.

• L'installation électrique de la pièce concernée correspond aux normes
IEC (ANSI).

• L'utilisation de l'appareil suit le mode d'emploi.

AVERTISSEMENT:

•A moins que cela ne soit manuellement possible, tout enlèvement ou ouverture
du boîtier peut entrainer la mise au jour de pieces sous tension.

• Si l'ouverture de l'appareil est nécessaire, celui-ci doit être coupé de chaque
source de courant. Ceci est à prendre en considération avant tout ajustement,
entretien, réparation ou changement de pieces.

• Ajustement, entretien ou réparation sur l'appareil ouvert et sous tension ne
peuvent être éffectués que par un spécialiste autorisé par le fabricant (selon
VBG4). Le spécialiste étant conscient des dangers liés à ce genre de réparation.

• Les sorties de baffles qui portent le signe IEC 417/5036 (fig. 1, voir en bas)
peuvent être sous tension dangereuse. Avant de brancher l'appareil utiliser
uniquement le câble de raccordement conseillé par le fabricant pour raccorder
les baffles.

•Toutes les prises des câbles de raccordement doivent être, si possible, vissées
ou verrouillées sur le boîtier.

• Utilisez subsidiairement uniquement des fusibles de type et de puissance de
courant nominale donnés.

• L'utilisation de fusibles rafistolés ou court-circuites est inadmissible.

• Ne jamais interrompre la connexion du circuit protecteur.

• Il est conseillé de ne pas toucher aux surfaces pourvues du signe "HOT" (fig. 2,
voir en bas), aux parois arrières ou caches munis de fentes d'aération,
éléments d'aération et leurs caches ansi qu'aux tubes et leurs caches.
Ces éléments pouvant atteindre des températures élévées pendant l'utilisation
de l'appareil.

• Les Niveaux de puissance élévés peuvent entrainer des lésions auditives
durables. Evitez donc la proximité de haut-parleurs utilisés à haute puissance.
Lors de haute puissance continue utilisez une protection auditive.

BRANCHEMENT SUR LE SECTEUR:

• L'appareil est conçu pour une utilisation continue.

• La tension de fonctionnement doit concorder avec la tension secteur locale.

• Le raccordement au réseau éléctrique s'effectue avec l'adaptateur ou le cordon
d´alimentation livré avec l'appareil.

• Adaptateur: Un câble de raccordement abimé ne peut être remplacé. L'adapta­teur est inutilisable.

•Evitez un raccordement au réseau par des boîtes de distribution surchargées.

• La prise de courant doit être placée à proximité de l'appareil et facile à atteindre.

LIEU D'INSTALLATION:

• L'appareil doit être placé sur une surface de travail propre et horizontale.

• L'appareil en marche ne doit en aucun cas subir des vibrations.

•Evitez dans la mesure du possible poussière et humidité.

• L'appareil ne doit pas être placé à proximité d'eau, de baignoire, lavabo, évier,
pièce d'eau, piscine ou dans une pièce humide. Ne placez aucun vase, verre,
bouteille ou tout objet rempli de liquide sur l'appareil.

• L'appareil doit être suffisamment aéré.

• Ne jamais recouvrir les ouvertures d'aération. L'appareil doit être placé à 20 cm
du mur au minimum. L'appareil peut être monté dans un Rack si une
ventilation suffisante est possible et si les conseils de montage du fabricant
sont suivis.

•Evitez les rayons de soleil et la proximité de radiateurs, chauffages etc.

• Une condensation d'eau peut se former dans l'appareil si celui-ci est transporté
brusquement d'un endroit froid à un endroit chaud. Ceci est particulièrement
important pour des appareils à tubes. Avant de brancher l'appareil attendre
qu'il ait la température ambiante.

• Accessoires: L'appareil ne doit être placé sur un chariot, support, trépied, bâti
ou table instable. Une chute de l'appareil peut entrainer aussi bien des domma­ges corporels que techniques. Utilisez l'appareil uniquement avec un chariot,
Rack, support, trépied ou bâti conseillé par le fabricant ou vendu en combinai­son avec l'appareil. Les indications du fabricant pour l'installation de l'appareil
sont à suivre, et les accessoires d'installation conseillés par le fabricant sont à
utiliser. Un ensemble support et appareil doit être déplacé avec précaution.
Des mouvements brusques et des revêtements de sol irreguliers peuvent
entrainer la chute de l´ensemble.

• Equipements supplémentaires: Ne jamais utiliser un équipement supplémen­taire n'ayant pas été conseillé par le fabricant, ceci pouvant entrainer des
accidents.

• Afin de protéger l'appareil pendant un orage ou s'il ne doit pas être utilisé
pendant un certain temps, il est conseillé d'enlever la prise au secteur.
Ceci évite des dommages dûs à la foudre ou à des coups de tension dans le
réseau à courant alternatif.

Fig. 1 Fig. 2

• L'apparecchio è stato costruito dalla HK AUDIO®secondo la normativa euro­pea IEC 60065 ed ha lasciato il nostro stabilimento in stato ineccepibile. Per
garantire il mantenimento di tale stato e un utilizzo assolutamente privo di ri­schi l'utente è tenuto ad osservare le indicazioni e gli avvertimenti di sicurezza
contenuti nelle istruzioni per l'uso. L'apparecchio rispecchia il livello di
sicurezza I (collegato a terra).

• Sicurezza, affidabilità e prestazioni dell'apparecchio vengono garantiti dalla
HK AUDIO®solo ed esclusivamente se:

• Montaggio, ampliamento, rimessa a punto, modifiche e riparazioni vengono
eseguite dalla HK AUDIO®stessa o da personale da essa autorizzato.

• Gli impianti elettrici nei locali prescelti per l'uso dell'apparecchio rispondono
alle normative stabilite dall'ANSI.

• L'apparecchio viene utilizzato come indicato nel libretto delle istruzioni per l'uso.

Avvertimenti:

• In caso di apertura di parti di rivestimento o rimozione di parti dell'involucro,
a meno che non si tratti di pezzi rimovibili semplicemente a mano, possono
venire alla luce parti dell'apparecchio conduttrici di tensione.

• Se l'apertura dell'apparecchio dovesse risultare necessaria è indispensabile
staccare precedentemente quest'ultimo da tutte le fonti di tensione. Rispettare
tale misura di prevenzione anche prima di un allineamento, di operazioni di
manutenzione, della messa in esercizio o della sostituzione di componenti
all'interno dell'apparecchio.

• Allineamento, operazioni di manutenzione o eventuali riparazioni dell'appa­recchio in presenza di tensione vanno eseguite esclusivamente da personale
specializzato ed autorizzato, in grado di eseguire tali operazioni evitandone
i rischi connessi.

• Le uscite degli altoparlanti contrassegnate dai caratteri IEC 417/5036 (vedi
illustrazione 1 a fondo pag.) possono essere conduttrici di tensione pericolosa
con cui evitare il contatto. Per questo motivo, prima di accendere l'appa­recchio, collegare quest'ultimo agli altoparlanti servendosi esclusivamente del
cavetto d'allacciamento indicato dal produttore.

•Tutte le spine e i cavi di collegamento devono essere avvitati o fissati all'invo­lucro dell'apparecchio per quanto possibile.

•Tutti i fusibili di sicurezza vanno sostituiti esclusivamente con fusibili del tipo
prescritto e valore della corrente nominale indicato.

• L'utilizzo di fusibili di sicurezza non integri e la messa in corto circuito del
sostegno di metallo sono proibite.

• Non interrompere mai il collegamento con il circuito di protezione.

• Superfici contrassegnate dalla parola "HOT" (vedi illustrazione 2 a fondo pag.),
cosi come griglie di aerazione, dispositivi di raffreddamento e i loro rivestimen­ti di protezione, oppure valvole e i relativi rivestimenti protettivi possono surri­scaldarsi notevolmente durante l'uso e per questo motivo non vanno toccate.

• L'ascolto di suoni ad alto volume può provocare danni permanenti all'udito.
Evitate perciò la diretta vicinanza con altoparlanti ad alta emissione di suono
e utilizzate cuffie protettive in caso ciò non sia possibile.

Alimentazione:

• L'apparecchio è concepito per il funzionamento continuo.

• La tensione di esercizio deve corrispondere alla tensione di rete a cui ci si allaccia.

• L'allacciamento alla rete elettrica avviene tramite alimentatore o cavetto d'ali­mentazione consegnato insieme all'apparecchio.

• Alimentatore: un cavo di connessione danneggiato non può essere sostituito.
L'alimentatore non può più essere utilizzato.

•Evitate un allacciamento alla rete di corrente utilizzando cassette di distribu­zione sovraccariche.

• La spina di corrente deve essere situata nelle vicinanze dell'apparecchio e
facilmente raggiungibile in qualsiasi momento.

Locali di collocamento:

• Opportuno collocare l'apparecchio su una superficie pulita e orizzontale.

• Non sottoporre l'apparecchio in funzione a scosse e vibrazioni.

• Proteggere l'apparecchio per quanto possibile da umidità e polvere.

• Non collocare l'apparecchio vicino ad acqua, vasche da bagno, lavandini, lavelli
da cucina, locali umidi o piscine. Non appoggiare recipienti contenenti liquidi ­vasi, bicchieri, bottiglie, ecc. - sull'apparecchio.

• Provvedere ad una buone aerazione dell'apparecchio.

•Eventuali aperture previste per la ventilazione dell'apparecchio non vanno ne
bloccate, ne mai coperte. L'apparecchio va collocato ad almeno 20 cm di di­stanza dalle pareti circostanti e può essere inserito tra altre componenti di un
impianto solo in caso di sufficiente ventilazione e qualora le direttive di
montaggio del produttore vengano rispettate.

•Evitare di esporre l'apparecchio ai raggi del sole e di collocarlo direttamente
nelle vicinanze di fonti di calore come caloriferi, stufette, ecc.

• Se l'apparecchio viene trasportato rapidamente da un locale freddo ad uno
riscaldato può succedere che al suo interno si crei della condensa. Ciò va
tenuto in considerazione soprattutto in caso di apparecchi a valvole. Attendere
che l'apparecchio abbia assunto la temperatura ambiente prima di accenderlo.

• Accessori: non collocare l'apparecchio su carrelli, supporti, treppiedi, superfici
o tavoli instabili. Se l'apparecchio dovesse cadere a terra potrebbe causare
danni a terzi o danneggiarsi irreparabilmente. Utilizzate per il collocamento
dell'apparecchio supporti, treppiedi e superfici che siano consigliate dal
produttore o direttamente comprese nell'offerta di vendita. Per il collocamento
dell'apparecchio attenetevi strettamente alle istruzioni del produttore, utili­zzando esclusivamente accessori da esso consigliati. L'apparecchio in combina­zione ad un supporto va spostato con molta attenzione. Movimenti bruschi o il
collocamento su pavimenti non piani possono provocare la caduta dell'appa­recchio e del suo supporto.

• Accessori supplementari: non utilizzate mai accessori supplementari che non
siano consigliati dal produttore, potendo essere ciò causa di incidenti.

• Per proteggere l'apparecchio in caso di temporali o nel caso questo non venisse
utilizzato per diverso tempo si consiglia di staccarne la spina di corrente.
In questo modo si evitano danni all'apparecchio dovuti a colpi di fulmine o ad
improvvisi aumenti di tensione nel circuito di corrente alternata.

Illustrazione 1 Illustrazione 2

• El aparato ha sido producido por HK AUDIO®según el IEC 60065 y salió de la
fábrica en un estado técnicamente perfecto. Para conservar este estado y
asegurar un funcionamiento sin peligros el usuario debe tener en cuenta las
indicaciones y advertencias contenidas en las instrucciones de manejo.
l aparato corresponde a la clase de protección l (toma de tierra protegida).

• LA SEGURIDAD, LA FIABILIDAD Y EL RENDIMIENTO DEL APARATO SOLO
ESTAN GARANTIZADOS POR HK AUDIO®CUANDO:

• el montaje, la ampliación, el reajuste, los cambios o las reparaciones se
realicen por HK AUDIO®o por personas autorizadas para ello;

• la instalación eléctrica del recinto en cuestión corresponda a los requisitos
de la determinación del IEC (ANSI);

• el aparato se use de acuerdo con las indicaciones de uso.

ADVERTENCIA:

• Si se destapan protecciones o se retiran piezas de la carcasa, exceptuando si se
puede hacer manualmente, se pueden dejar piezas al descubierto que sean
conductoras de tensión.

• Si es necesario abrir el aparato, éste tiene que estar aislado de todas las
fuentes de alimentación. Esto se debe tener en cuenta antes del ajuste, de un
entretenimiento, de una reparación y de una sustitución de las piezas.

• Un ajuste, un entretenimiento o una reparación en el aparato abierto y bajo
tensión sólo puede ser llevado a cabo por un especialista autorizado por el
productor (según VBG 4) que conozca a fondo los peligros que ello conlleva.

• Las salidas de altavoces que estén provistas de la característica IEC 417/5036
(figura 1, véase abajo) pueden conducir tensiones peligrosas al contacto. Por
ello es indispensable que antes de poner en marcha el aparato; la conexión se
haya realizado únicamente con el cable de empalmes recomendado por el
productor.

• Las clavijas de contacto al final de los cables conectores tienen que estar
atornilladas o enclavadas a la carcasa, en tanto que sea posible.

• Los fusibles de repuesto que se utilicen sólo pueden ser del tipo indicado y
tener la intensidad nominal indicada.

• El uso de fusibles reparados o la puesta en cortocircuito del soporte es
inadmisible.

• El empalme del conductor de protección no se puede interrumpir en ningún
caso.

• Las superficies provistas de la característica "HOT" (figura 2, véase abajo),
los paneles de fondo trasero o las protecciones con ranuras de ventilación, los
cuerpos de ventilación y sus protecciones, así como las válvulas electrónicas y
sus protecciones pueden alcanzar temperaturas muy altas durante el funcio­namiento y por ello no se deberían tocar.

• Niveles elevados de la intensidad de sonido pueden causar continuos daños
auditivos; por ello debe evitar acercarse demasiado a altavoces que funcionen
a altos niveles. En tales casos utilice protecciones auditivas.

ACOMETIDA A LA RED:

• El aparato está proyectado para un funcionamiento continuo.

• La tensión de funcionamiento ajustada tiene que coincidir con la tensión de la
red del lugar.

• La conexión a la red eléctrica se efectuará con la fuente de alimentación o con
el cable de red que se entreguen con el aparato.

•Fuente de alimentación: una linea de conexión dañada no se puede sustituir.
La fuente de alimentación no puede volver a ponerse en funcionamiento.

•Evite una conexión de la red eléctrica a distribuidores con muchas tomas de
corriente.

• El enchufe para el suministro de corriente tiene que estar cerca del aparato
y ser de fácil acceso.

SITUACION:

• El aparato debería estar situado en una superficie limpia y totalmente horizontal.

• El aparato no puede estar expuesto a ningún tipo de sacudidas durante su
funcionamiento.

• Se deben evitar la humedad y el polvo.

• El aparato no puede ponerse en funcionamiento cerca del agua, la bañera, el
lavamanos, la pila de la cocina, un recinto con tuberías de agua, la piscina o en
habitaciones húmedas. Tampoco se pueden poner objetos llenos de líquido ­jarrones, vasos, botellas, etc. - encima de él.

• Procure que el aparato tenga suficiente ventilación.

• Las aberturas de ventilación existentes no se deben bloquear ni tapar nunca.
El aparato debe estar situado como mínimo a 20 cm de la pared. El aparato
sólo se puede montar en un rack, si se ha procurado la suficiente ventilación y
se han cumplido las indicaciones de montaje del productor.

•Evite los rayos del sol directos así como la proximidad a radiadores, electro­radiadores o aparatos similares.

• Si el aparato pasa repentinamente de un lugar frío a otro caliente, se puede
condensar humedad en su interior. Esto se debe tener en cuenta sobretodo en
los aparatos con válvulas electrónicas. Antes de poner en marcha el aparato se
debe esperar hasta que éste haya adquirido la temperatura ambiental.

• Accesorios: el aparato no se puede colocar encima de carros, estantes, trípodes,
soportes o mesas inestables. Si el aparato se cae puede causar daños perso­nales y se puede estropear. Coloque el aparato sólo en un carro, rack, estante,
trípode o soporte recomendado por el productor o que se le haya vendido junto
con el aparato. En la instalación se deben seguir las indicaciones del productor
así como utilizar los accesorios recomendados por el mismo para colocarlo
encima. El conjunto del aparato con el pedestal se debe mover con mucho
cuidado. Un paro brusco, la aplicación de una fuerza desmesurada o un suelo
irregular puede ocasionar la caida de todo el conjunto.

• Piezas adicionales: no utilice nunca piezas adicionales que no estén recomen­dadas por el productor, ya que se podrían provocar accidentes.

• Para protejer el aparato de una tormenta o si no se supervisa ni utiliza durante
algún tiempo, se debería desconectar la clavija de la red. Así se evitan daños en
el aparato a causa de un rayo y golpes de tensión en la red de corriente alterna.

Figura 1 Figura 2

VX Manual 1.2

page 22

1Content

1 Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2 VX Series Power Amps . . . . . . . . . . . . . . . . . . . . .4

2.1 Welcome into the HK Audio family! . . . . . . . . . .4

2.2 Protective Functions . . . . . . . . . . . . . . . . . . . . .4

2.2.1 Short Circuit . . . . . . . . . . . . . . . . . . . . . . . . . .4

2.2.2 Overheating . . . . . . . . . . . . . . . . . . . . . . . . . .4

2.2.3 Direct Current . . . . . . . . . . . . . . . . . . . . . . . . .5

2.3 Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . .5

3 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

3.1 Master Switch . . . . . . . . . . . . . . . . . . . . . . . . . . .5

3.2 Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

3.3 Input Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

3.4 Protect LED . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

3.5 Clip LED's . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

3.6 Active LED's . . . . . . . . . . . . . . . . . . . . . . . . . . .6

4 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

4.1 Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

4.2 Ground-lift Switch . . . . . . . . . . . . . . . . . . . . . . .6

4.3 Mode Switch . . . . . . . . . . . . . . . . . . . . . . . . . . .6

4.4 Limiter Button . . . . . . . . . . . . . . . . . . . . . . . . . .7

4.5 Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

4.6 Mains Socket . . . . . . . . . . . . . . . . . . . . . . . . . . .7

4.7 Impedance Switch (models VX 800 and

VX 1200 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

5 Technical Specifications . . . . . . . . . . . . . . . . . . . .8

2 VX Series Power Amps

2.1 Welcome into the HK Audio family!

The new HK AUDIO VX Series of professional power
amplifiers combine modern design features with
utmost durability and reliability to guarantee depen­dable, totally trouble-free service for many years to
come. Its low weight, compact dual-rack space
design and a solid chassis designed to withstand the
rigors of gigs and touring contribute to both
handling ease and a long life on the road.
While we were developing the VX power amps, we
were particularly intent in not only providing you

with plenty of output power, but also made sure your
amp has greater headroom reserves for as distorti­on-free signal as possible. These features enable the
kind of transparent, accurate response required in
the age of digital signal sources.
To assure maximum reliability, all VX power amps
undergo extensive quality control checks by both
man and machine. Our engineers inspect every amp
when it comes off the assembly line and run
computer tests on it. Finally, the power amps are
subjected to a thorough endurance test under the
harshest of conditions. This is our way of ensuring
that we catch even the most minor divergence from
our exacting quality control specifications and rectify
it before an amp leaves our facility. You get a tried
and true product that—like all HK Audio products—
meets the most exacting standards so that you can
focus on your performance instead of worrying about
your equipment.

2.2 Protective Functions

2.2.1 Short Circuit

The input and output jacks of the VX-Series power
amps are protected against all conceivable faults,
including defective cords and speaker systems (e.g.
with damaged circuit boards in the crossover). These
amps could even be operated with short-circuited
outputs without being damaged. Since, however, this
protective function places a heavy load on the output
stages, you should ensure you unplug defective
speakers or cords immediately. Under no
circumstance should you short-circuit the outputs
intentionally or for testing purposes.

2.2.2 Overheating

If a VX power amp overheats, the output signal
cancels out at irregular intervals and the Protect LED
lights up. But since the VX power amps were develo­ped for problem-free performance under the worst
conditions and have undergone testing in extreme
environments, it is unlikely that this will occur under
normal circumstances. If your amp does overheat, be
sure to check if the power amp is getting proper
ventilation and whether the internal ventilation

5

system of the power amp is still functioning correctly
(see 2.2).

2.2.3 Direct Current

If an internal defect causes direct current to be
routed to the output of the VX power amp, it is
diverted from the outputs via a thyristor circuit. This
prevents a dangerous DC signal from reaching t

2.3 Rack Mounting

When mounting VX power amps to 19" transport
racks, be sure to not only fasten the power amps to
the case via the front brackets, but also attach the
rear supporting brackets. Fastening the front
brackets alone may hold the amp in place tempora­rily, but not permanently. The front rack brackets
cannot bear the weight and stresses alone; you need
the additional stabilization at the back. If you don't,
knocks or vibrations sustained during transport may
lead to power amp chassis damage.

3 Front Panel

3.1 Master Switch

This switch features an integrated automatic circuit
breaker that shuts the power amp off should it be
overloaded. After normal operating conditions are
restored, you don't have to replace any secondary
fuses in the device, simply reactivate the main power
switch. When the amp is powered up, its operational
status is indicated by the green ON LED.

3.2 Ventilation

The internal fan sucks fresh air from the front and
expels the heated air through the vents at the rear of
the amp. If the air intake and/or outlet vents of the
power amp are for some reason obstructed, we
highly recommend that you provide additional venti­lation. If the flow of air remains unobstructed,
external cooling of the power amp is not necessary.
The intake ventilation duct of the VX power amp is
equipped with a filter that collects dust. We recom­mend that you clean this filter regularly since a
constant operating temperature significantly increa­ses the service life of the power amp's electronic
components. To this end, remove the two screws on
the front grille of the VX power amp and then the
grille itself. Next remove the dust filter and rinse it
with warm water. Replacement dust filters are availa­ble from HK Audio. If you intend to use your power
amp under relatively extreme conditions, it can be an
advantage to remove the filter to maximize the
cooling effect for the power amp. However, if you
remove the filter, the ventilation ducts in the interior
of the power amp must be cleaned regularly by a
qualified service technician.

3.3 Input Level

These control features are used to determine the
amp's input sensitivity. Turning a knob clockwise
increases input sensitivity; i.e. the output signal of
the power amp becomes louder. The dB increments
on the knob indicate by how many decibels the
maximum output of the power amp is reduced.

English

Note: When you are setting up a sound system, the
power amps should be the last devices that you
power up. In other words, don't switch them on until
all other devices are on. When you shut a system
down, always switch off the power amps first and
then all the other devices in the signal chain.

3.4 Protect LED

This LED can indicate different defects in the
operation of the power amp, depending on how it
illuminates. If the Protect LED goes on and stays on,
the power amp is overheated. Check the connections
and ventilation or provide external ventilation. Once
the power amp has cooled back down to normal
operating temperature, the power amp will
automatically switch itself back on.
If, after cooling back down, the power amp does not
switch back on to normal operating status, this
indicates that there is some type of internal defect.
In this case, a qualified service engineer should

VX Manual 1.2

check the power amp. If the Protect LED flashes at
three-second intervals, there is some kind of fault in
the connected load, i.e. either the impedance of the
connected loudspeaker system is too low for the
power amp or an output is short-circuited. Also
check the connected speaker system and the speaker
cords for faults. Here too, you don't have to power
the amp up again. After you've eliminated the source
of the problem, it will resume operation
automatically.

3.5 Clip LED's

These LED's illuminate to indicate that the amp has
run out of headroom and has exceeded its perfor­mance threshold. Occasionally, this LED may flash
briefly. This is not a problem because the design of
the power amp makes it possible for peak pulses
such as a snare drum or similar signals to briefly ex­ceed the normal threshold. If however this LED
lights up with just a few interruptions or if it illumi­nates continuously, you should definitely lower the
level of the input signal. If you run the power amp
when it is clipping heavily, the distorted output sig­nals can destroy the connected speakers even if the­se are equipped with protection circuits.

Caution: HK Audio is not liable for damage to spea­ker systems due to overload caused by improper
operation of the power amp.

3.6 Active LEDs

This green LED indicates whether this amp channel
is active, that is, whether an input signal is present.
(It is possible, however, for a very soft signal to make
it through the entire amp without even triggering the
LED to glow.)

4 Rear Panel

4.1 Inputs

The power amp is equipped with two input sockets
for each power amp channel: one XLR female (pin 1
= ground; Pin 2 = +; Pin 3 = --) and one 1/4" stereo
jack (tip = +; ring = --; sleeve = ground). Both jacks
are balanced and connected internally in parallel,
therefore making it possible to use these inputs to
patch the incoming signal out to more power amps.

We recommend that you use only balanced cabling
for the input signals in order to avoid noise induced
by electro-magnetic fields and radio frequency inter­ference. If the signal source which you are connec­ting to the VX power amp input is itself unbalanced,
we still recommend that you use a standard balanced
cable to connect between the two, but with one of
the ends modified. Modify the plug which is connec­ted to the output of the unbalanced signal source as
follows: if the unbalanced source has an XLR output
jack, bridge pin 1 and pin 3 of the XLR plug; if the
unbalanced source has a 1/4” output jack, bridge the
ring and the sleeve of the 1/4" plug. This "quasi"
balanced arrangement will help eliminate possible
interference via the common mode rejection circuit
of the input.

4.2 Ground-lift Switch

This button separates the signal ground from the
chassis ground in order to eliminate hum caused by
ground loops. The chassis remains grounded so that
power amp safety is not compromised. The ground
circuit is severed when the button is pressed in.

Note: Hum is often a sign of a faulty power supply,
especially when your equipment is fed by multiphase
power supply circuits. In this case, do not attempt to
solve the noise problem by lifting the ground with
this switch; instead, check the cables and ground
circuits of your mains power supply.

4.3 Mode Switch

This sliding switch configures the power amp for
three different operating modes:

• Stereo: This is the standard operating mode.
Two independent signals are patched to the amp,
amplified by the two power amp channels and sent
to two independent speaker systems.

• Mono: The two inputs are connected in parallel, i.e.
a single input signal is routed to both power amp
channels, and the output signals of both channels
are identical.

• Bridge: The two inputs are connected in parallel,
however, antiphase signals are routed to the power
amp channels and therefore the outputs. If you

7

connect a speaker system to the positive terminals
of the two outputs (see 4.5), the total power output
of the amp can be tapped for driving this speaker
system. For example, with the VX 2400, the total
output power is 2400 watts).

4.4 Limiter Button

The internal limiters of the VX power amp can be
switched off via this button. Pressing this button in
deactivates the limiters of both channels. The
internal limiters make the most of the available
power. They adapt the VX power amp to the current­ly available dynamic headroom as precisely as
possible without exceeding the clipping threshold so
that the amp is not operated in a permanent state of
overload. However, the limiters do allow peak
impulses to briefly exceed the clip threshold. Both
the power amp and the connected speaker systems
can handle spikes well above the official power
output rating for continuous signals. Only when
these signal peaks exceed the threshold for a longer
period of time do the internal limiters dampen the
signals in order to prevent distortion in the output
signal of the power amp. This intelligent limiting
circuitry significantly expands the dynamic range of
the power amps. The only thing you have to do is
turn up the input level to a point where the Clipping
LEDs illuminate occasioally; the limiters themselves
automatically make the best possible use of availa­ble headroom. What's more, you won't have to
worry about your speaker system because the
limiters ensure they won't be overloaded.

4.5 Outputs

Both binding posts and two four-pin Speakon
sockets are available for connecting speaker systems
(Pin 1+ = +; Pin 1– = –).

The Speakon socket A is designed for bridge mode
and biamping. For biamping purposes (e.g. with
active systems), the output signals of both power
amp channels are routed to the Speakon socket A
(Pin 1+ = Channel A+; Pin 1– = Channel A–;
Pin 2+ = Channel B+; Pin 2-- = Channel B --). In this
mode, the power amp is operated in two-channel
mode as always. The high frequency and low

frequency signals are routed separately to one power
amp channel each, but you only have to connect one
four-pin Speakon-cable to the speaker system.
In bridge mode, the speaker system is connected to
the positive terminals of both power amp outputs,
i.e. Channel A+ is connected to the positive terminal
of the speaker system and Channel B+ of the power
amp is connected the negative terminalof the
loudspeaker system.
Caution: If you want to connect a speaker system to
the power amp's Speakon
in bridge mode, then you must make a special

®

Speakon
two Speakon
follows: 1+ of the power amp to 1+ of the speaker
system and 2+ of the power amp to 1– of the
speaker system. The other pins remain unassigned.

cable for this purpose. The pins for the

®

plugs have to be connected as

®

socket while the amp is

4.6 Mains Socket

Connect the VX power amp via a standard (non­heating equipment) power cable to the AC power
supply. However, before you plug the power amp
into a wall outlet, ensure that your local mains
voltage is the same as that specified on the back of
the unit near the AC socket. If you attempt to run
your VX power amp on the wrong mains voltage, you
can cause serious damage to the power amp!

4.7 Impedance Switch

(models VX 800 and VX 1200 only)

While the largest model in the VX series of power
amps is permanently set to a minimum load
(4 Ω in the case of the VX 2400, and 2 Ω with the
VX 2402), you can select the minimum impedance
of the smaller models with a switch. If the switch is
set to 4 Ohms, ensure that your connected load
does not fall below this value.

Caution: Do not under any circumstances change
this switch while the amp is in operation. Make any
and all changes only after turning the amp off.

English

VX Manual 1.2

5 Technical Specifications

Classification: Switched-mode power supply power amp with limiters
All level indications refer to 0 dBV (1 V RMS).

Inputs

A, B Input
Sockets: XLR (1 = ground; 2 = +; 3 = --) and stereo 1/4" (tip = +; ring = --; sleeve = ground)
Ty pe: Parallel electronically balanced 1/4" and XLR jacks
Input impedance: 20 kOhms balanced, 10 kOhms unbalanced (VX 800: 22 kOhms balanced, 12 kOhms unba­lanced)

Outputs

Channel A, B

®

Speakon
Pin assignments: binding posts red = +; black = -- / Speakon®: 1+ = +; 1-- = -- ; 2+ and 2-- unconnected

NL4 jacks and binding posts

Biamp/Bridge

®

Both power amp outputs routed to one Speakon

NL4 socket

Pin assignments: 1+ = Channel A+; 1-- = Channel A--; / 2+ = Channel B+; 2-- = Channel B-

A special Speakon

®

cable must be used in bridge mode! Pin assignments for the bridge cable: 1+ amp = 1+

speaker; 2+ amp= 1-speaker, the other two contacts must remain open or unconnected!

General

Controls: Master Power Switch, Input Sensitivity Knob, Operating Mode Switch, Internal Limiters, Ground-Lift.
Displays: On, Protect, Signal And Clipping LEDs.
Protective Circuits: Full DC fault, thermal and short-circuit protection
Cooling: Aluminum cooling element in ventilation channel, servo-controlled ventilator (air flow from front to
back)

Electrical Specifications

Frequency response: 20 Hz to 20000 Hz (±1 dB)
Crosstalk

-75 dB at peak level and 1 kHz (except VX 800: -80 dB)

-60 dB at peak level and 20–20000 Hz (except VX 800: -75 dB)
Signal to noise ratio: -103 dB at peak level (except VX800: -101 dB)
Damping factor: >600, 20–400 Hz with an 8-Ohm load
Rise time: 25 V/ms, 50 V/ms in Bridge Mode (except VX800: 20 V/ms / 40 V/ms)
CMRR @60 Hz: minimum of 48 dB, typically 56 dB (except VX 800: 54 dB/ 66 dB)

Power consumption
VX 800/1200: 1440 watts (IEC 60 065)
VX 2400/2402: 1800 watts (IEC 60 065)