Hughes Kettner cohedra schematic

Manual 2.0

English

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

Important Safety Instructions

Before connecting, read instructions

Important Advice on Safety!

Please read before use and keep for later use!

• L'appareil a été conçu par HK AUDIO

®

selon la norme IEC 60065 et a
quitté l'entreprise 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,
electro-radiadores 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

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!

Cohedra™ Manual 2.0

Preface

This manual is addressed to all technicians who
are responsible for setting up, operating and main­taining the HK AUDIO

®

COHEDRA™ system.
In addition, we would like to explain in detail
the principles and functions of HK AUDIO

®

COHEDRA™ technology to all interested
planning and installation engineers.

Content

A COHEDRA™ Technology

B COHEDRA™ Loudspeakers

C COHEDRA™ Transport Solution

D Rigging and Curving COHEDRA™ System

E COHEDRA™ Setups with CAPS

F COHEDRA™ Controller Concept

GController and Controller Software

H COHEDRA™ Power-Racks

I Power Amp VX 2400

J Patchbay PB5

K Service

L Appendix/ Reference library

Cohedra™ Manual 2.0

Chapter A

COHEDRA™ Technology

MS D-1139 Deck 08/04

Content

1 Line Array Approaches in Recent Years . . . . . 2

2 Development Objectives . . . . . . . . . . . . . . . . 3

2.1 High Frequency Range 3

2.2 Middle Frequency Range 3

2.3 Low Frequency Range 3

3 Emphasized Radiation Technology™ . . . . . . . 3

3.1 The High Frequency Wave Front 4

3.2 Midrange 5

3.3 The Subwoofer- Truest Dynamic Response 5

Index of Figures:

Figure 1: Comparison of a 4 m array’s

near-to-far field transition

in theory and practice 2
Figure 2: Gap due to curving 2
Figure 3: Emphasized radiation in a line array 3
Figure 3.1: Extended line Array near-field 3
Figure 4: Effect without gap (red), with evenly

distributed gap (blue), and with

unevenly distributed gap (pink) 3
Figure 5: Typical J shape 3
Figure 6: The COHEDRA™ acoustic lens’

mode of operation 4
Figure 7: The COHEDRA™ acoustic lens 4
Figure 8: Effect of the synthetic fiber fleece 4
Figure 9: Front view of the COHEDRA™

CDR 208 mid/high enclosure 5
Figure 10: 8" speaker cover serving as a

CD horn and part of the

compression chamber 5
Figure 11: Comparison of moving masses 5
Figure 12: Impulse response: ideal (blue),

10" (red), 18" (purple) 5

Version 2.0 A - 1

1 Line Array Approaches
in Recent Years

Line arrays are a fixture on the contemporary sound
reinforcement scene. The design principle has its
origins in the stacks of cone loudspeakers that were
popular in the ‘70s.
Some 20 years later, the coherent wave front’s ingress
into the high frequency range through waveguides
and acoustical mirrors ushered in a second genera­tion of line arrays.

Here a line source makes use of the near field’s dif­fusion. At a certain distance, the radiated cylindrical
wave front’s near field transitions into a spherical
wave front. This transition from a cylindrical to a
spherical wave is contingent upon the length of the
radiator and the radiated frequency. The following
formula by Christian Heil serves to calculate the
distance at which this transition occurs:

H in meters, f in kHz

Mark Ureda, in turn, proposed a somewhat different
formula for calculating the ratio between the near
and far fields:

l in meters, f in Hz

However, when these formulae are charted in a
graphical comparison, it is evident that their results
are quite similar.

Though in general it would appear that all aspects
of modern line arrays have been described ex-haus­tively, practical applications reveal some deficiencies.

According to the aforementioned formulae, at a fre­quency of 16 kHz the near field of a line array with
the length of 4 m extends out to 380 m!
Anyone who has heard a line array of comparable
size perform is sure to confirm that this great a
range cannot be attained in a real-world scenario.
The fact is that these values must be scaled down
substantially (see Fig. 1). Consequently, the afore­mentioned formulae for a continuous line source
are more theoretical in nature.

Why these differences between theory and practice,
and why does a cylindrical wave transition into a
spherical wave front rather than diffuse infinitely?

The answer is quite simple in view of the molecular
structure of air. Air molecules offer frictional resi­stance, impeding the sound wave’s diffusion.
Some sound molecules drift outwards when the
wave’s impact excites inert molecules at its fringes.
The cylindrical wave front’s keen edges are smoothed
by degrees, gradually transforming the cylindrical
wave into a spherical wave front.
In mathematical terms, this can be described as a
sound vector pointing slightly outward at its fringes.
Because the velocity of propagation remains constant,
the cylindrical wave slowly tran-sition into a spheri­cal wave.

Technical literature describes the molecular frictional
resistance of air as atmospheric absorption of sound,
which increases exponentially as the frequency rises.
Accordingly, frictional resistance is greater at higher
frequencies, meaning that at higher frequencies,
the transition described occurs at a closer distance
(or smaller ratio).

Similar effects have been observed in analog tech­nology where a square signal is smoothed by a
low-pass filter. It can be said that at some point
the signal regains a sine-like form.

Values that are possible in theory are again reduced
in practice because the line source is not in fact
continuous in the high frequency range; instead,
it is composed of individual segments. Even with
the most painstaking effort, it is impossible to prevent
interference with or drop-outs of the continuous line
source in practical applications because housings
and edge diffraction inevitably cause some interfe­rence.

Furthermore, in theory this continuous line source
would always be linear! However, gaps are created
in the air when an array is curved, tearing the line
source apart and further reducing the range.
In order to preclude the phenomenon of gaps created
by curving, a line array would have to con-sist of
very many individual elements (N=>∞), which un-
fortunately is practically infeasible (see Fig. 2a, 2b).

An effort to take these deficiencies into account led
to a next generation line array, with the following
section examines.

Consequently, all the aforementioned formulae
concerning a continuous line source are purely
theoretical nature and must be qualified consider­ably in practical applications.

Cohedra™ Manual

COHEDRA™ Technology

Figure 1: Comparison of a 4 m array’s near-to-far field

transition in theory and practice

Figure 2a: Continuous line source

Figure 2b: Gap due to curving

A - 3

2 Development Objectives

2.1 High Frequency Range

The tweeter should radiate coherent waves through­out its frequency range. In addition, the phase posi­tion should be fine-tuned and tweaked to harmonize
with the midrange woofer to afford the highest
possible fidelity and natural response. In order to
ensure uniform dispersion of sound, the driver should
channel into a constant directivity horn that is free
of undesirable diffractive effects and does not
adulterate the sonic image.

2.2 Middle Frequency Range

Midrange frequencies should be projected in short,
dry bursts. Homogenous dynamic response appro­priate to the tweeter is also desirable. Like the
tweeter’s time-aligned frequencies, the midrange
woofer should be time-aligned for all frequencies
that it transmits. To fulfill a line array system’s
handling potential, its mid/high unit should satisfy
the requirements of full-range voice applications.

2.3 Low Frequency Range

Low frequency energy should be dispersed into the
air faster and with the greatest possible dynamic
precision. A bass array with a large near field is
desirable. Subwoofers should be designed for versa­tility, affording greatest flexibility in setup options.

3 Emphasized Radiation
Technology™

So how does one go about developing a next
generation line array? Emphasis is a familiar concept
in analog technology. What this means is that those
signal components that will later be dampened are
emphasized first. To apply this concept to wave
fronts, the fringes that are later smoothed must be
emphasized first. In this case, emphasis means
simply that the edge areas are projected earlier in
time, forming a slightly inward curving wave front
whose sound vectors face slightly inwards
(see Figure 3 A).

When applied to a continuous line source, this
creates a waveform as shown Fig. 3 B. Because
large line arrays typically consist of several identical
segments, a dedicated speaker would be required
for each segment. Apart from the fact that such a
continuous line source would be hard to implement,
practical applications also mandate great flexibility,
rendering such a concept in-feasible.

For these reasons, every element is curved slightly.
(Fig. 3C). Due to the gaps between the elements,
which as stated above are inevitable anyway, both
ends of every element’s wave fronts are reshaped in
the same way. A line source forms again at a certain
distance (Fig. 3.1). Emphasized Radiation technolo­gy is thus able to sustain the even wave for a longer
period, thereby significantly extending the line ar­ray’s near field in the high frequency range!

To clarify the influence of the gap, the following exa­mines the directivity of an ideal line array without
gaps and of a line array with evenly and unevenly di­stributed gaps. Basically, it can be said that every
line source is always accompanied by undesirable
side lobes. Like interference, these side lobes are
clearly audible artifacts and therefore extremely un­desirable. Unfortunately, they cannot be avoided al­together, so it is important to minimize their level.

Figure 5 shows that an unevenly distributed gap
(pink) causes more irregular and more pronounced
side lobes. Without a gap (red) present, the array’s
first side lobe occurs at a level of -13.58 dB. When
distributed across four elements of the same size
(blue) with the gap accounting for 18 percent of the
surface area, the level increases to -12.83 dB. If the­se gaps are distributed unevenly, the level of the
first side lobe rises to -11.93 dB. This is nearly 1 dB
higher than the level attained with the unevenly di­stributed gap alone!

It is very important that the gap is distributed as
uniformly as possible across the full breadth of the
radiator. COHEDRA™ achieves this by using two
different housing shapes for the mid/high array,
affording the greatest possible uniformity in gap
size for all typical configurations. This also ensures
minimum variation in gap size for the J array, a
configuration that today is used almost exclusively.

Version 2.0

Figure 3: Emphasized radiation in a line array

Figure 3.1: Extended line Array near-field

Figure 4: Effect without gap (red), with evenly distributed

gap (blue), and with unevenly distributed gap (pink)

Figure 5: Typical J shape

Cohedra™ Manual

COHEDRA™ Technology

3.1 The High Frequency
Wave Front

A specially developed and patented acoustic lens
serves to curve the wave front. It transforms the
spherical wave emitted by the high frequency driver
into an inward curving wave front.

To shape a curved wave front, the sound wave’s
inner components are re-channeled into a bisected,
centrically symmetrical array. In contrast to an axial
symmetrical array, a centrically symmetrical array
has the advantages of lower manufacturing toleran­ces. What’s more the subdivided cavity enables
fewer standing waves, thereby reducing interference.

Typically, these constructions are relatively long to
minimize the differences between S1 and S2. Howe­ver, acoustically speaking this creates something ap­proaching an organ pipe. The only remedy is to con­nect a very large horn, an option that for technical
reasons is often infeasible. A covering with a porous
absorber is another possibility. Designed to reduce
the velocity jump in sound particle acceleration, this
covering must be acoustically very transparent.

To this end, COHEDRA™ employs a special synthetic
fiber fleece with defined aerodynamic resistance.
This absorber reduces the velocity jump in sound
particle acceleration, thereby helping considerably
to homogenize frequency response. Figure 8 illu­strates the fleece’s effect. The red curve shows
amplitude without fleece, the blue curve with fleece.
The two curves are depicted in staggered formation
only for the purpose of illustration.

Figure 7: The COHEDRA™ acoustic lens

Figure 8: Effect of the synthetic fiber fleece

Figure 6: The COHEDRA™ acoustic lens’ mode

of operation

A - 5

3.2 Midrange

A frequently occurring and often cited drawback of
line arrays is their sensitivity to wind. A look at the
construction of conventional line arrays reveals that
many do without a CD horn. Therefore, the HF pat­tern of throw is increasingly constricted. It is not
uncommon for a radiation angle of an HF unit
nominally rated for 120° to come to just 50° at 16 kHz.
A light wind from the side audibly carries away the
HF signal. In the case of conventional speaker
clusters this is not so significant because several
HF units are arrayed horizontally and these pick
up the slack to provide HF sound reinforcement.
In a line array, however, it is always just one HF unit
that is arrayed horizontally to target a predetermined
audience area!

A special speaker cover is located in front of the two
8" midrange speakers. Designed to shape the horn
contour with CD characteristic in front of the acoustic
lens, it is free of undesirable diffractive effects and
does not adulterate the sonic image. It does not
constrict the HF range and ensures greater stability
in the face of gusts of wind.
The sound of the 8" speakers emanates through
slots on the top and bottom of this cover. This en­hances the dynamic balance in the range of 130 to
900 Hz.
r
In addition, the cover creates a compression chamber
that behaves like an acoustical filter, suppressing
frequencies that lie above the rendered frequency
range. Rather than being dissipated, the energy is
displaced to a lower frequency range, thereby sub­stantially increasing efficiency in the rendered fre­quency range! Because the speaker now acts against
a limited volume of air, distortion decreases so that
very high levels can be achieved with little distortion,
much like in a horn.

3.3 The Subwoofer­Truest Dynamic Response

A great drawback of conventional woofers is the
considerable moving mass of the speaker (generally,
18”). As a result, low frequency reproduction is
marred by dynamic distortion.
There is only way to satisfy the desire for the driest,
cleanest possible low end response; that is to achieve
the best possible impulse behavior. By definition,
this requires a smaller speaker membrane with less
moving mass. The answer is a special 10" woofer.
Compared below is a typical 18"+12"+2" combination
and the COHEDRA™ solution. Notably, the speaker
membrane’s moving mass in the low and middle
frequency ranges is clearly reduced.

Superior impulse behavior is also evident in the 10"
speaker’s transient response. In comparison with an
18" woofer, the membrane of the 10" woofer is able
to move much faster because its transients are
shorter.

The blue curve shows the in theory ideal response
and the red curve indicates the 10" speaker’s transient
response. The purple curve shows the transient re­sponse of the 18" woofer. Measurements were taken
using a second order, 130Hz low-pass filter.
New filtering approaches were necessary to make
the most of the 10" woofer’s capabilities, which is
why the housing also sports some special design
features. In combination with the bass reflex channel,
the baffle boards form a horn, resulting in a higher
level in the low frequency range. The long, lean
chassis supports the formation of bass arrays as
well as ground coupling. In addition, extremely
compact clusters can be configured by setting en­closures on end. Because the loudspeaker chassis is
tropic-proof, the enclosure can do without a level­dampening front covering.

Version 2.0

Figure 9: Front view of the COHEDRA™

CDR 208 mid/high enclosure

Figure 10: 8" speaker cover serving as a CD horn and

part of the compression chambe

Figure 12: Impulse response: ideal (blue), 10" (red),

18" (purple)

Figure 11: Comparison of moving masses

Cohedra™ Manual

Chapter B

The COHEDRA™ Loudspeakers

MS D-1139 A 08/04

Content

1 COHEDRA™ Loudspeakers . . . . . . . . . . . . . . 2

1.1 CDR 208 S and CDR 208 T Mid/High

Enclosures 2

1.2 CDR 210 Sub Subwoofer 3

1.3 CDR 210 F Sub Subwoofer 4

Index of Figures:

Figure 1: Cohedra CDR 208 T 2
Figure 2: Cohedra CDR 208 S 2
Figure 3: Cohedra CDR 210 Sub 3
Figure 4: Cohedra CDR 210 F Sub 4

Version 2.0 B - 1

Cohedra™ Manual

The Cohedra™ Loudspeakers

1 COHEDRA™
Loudspeakers

1.1 CDR 208 S and CDR 208 T
Mid/High Enclosures

Design and Construction of the Mid/High Enclosures

Two types of housings are available, the purpose of
the different design being to optimize the typical ”J”
form of mid/high arrays. The CDR 208 S is housed
in a straight rather than slanted cabinet. The CDR
208 T (T is short of trapezoidal) enclosure’s top
and bottom are slanted at 4.5° angles, a design that
enables the configuration of sharply curving down-fills.
CDR 208 S and CDR 208 T enclosures are made of
19 mm, 13-ply birch plywood and coated with water­repellent, black acrylic enamel. The baffle board
cover consists of a metal grille that also serves as
a compression chamber and a horn channel for
the 1.4" driver.

The CDR 208 S and CDR 208 T weigh 30 kg.
They are 65 cm wide, 25.5 and 24 cm high, respectively,
and 60 cm deep (including rigging attachments).
Two slot grips have been routed into the side panels
for easy transport and set-up.

Serving to fly the enclosures are fully integrated
rigging attachments comprising four quick-release
pins and three rigging connectors, two mounted on
the sides and one in the rear.

Electrical and Acoustical Data

CDR 208 S (T) enclosures feature two horn-loaded
8" cone chassis speakers and a 1.4" B&C high fre­quency driver with a front-mounted acoustic lens in
a CD horn configuration. Aligned in a tri-axial array,
the drivers are addressed via an internal passive
crossover with a separating frequency of 800 hertz.

CDR 208 S (T) enclosures’ nominal electrical
power-handling capacity is 500 watts RMS at 8 ohms
impedance. They produce a sound pressure level of
108 dB (1W@1m), measured under half-space con­ditions. Maximum SPL measured under the same
conditions at a distance of one meter is 138 dB
at 10% THD.

The CDR 208 S (T) enclosures’ horizontal dispersion
pattern is 80°. Frequency response ranges from
88 Hz to 16 kHz (±3 dB). The CDR 208 S (T) enclo­sures are thus able to provide sound reinforcement
public address applications calling speech only
without requiring a subwoofer.

Connections

The connector panel on the rear of CDR 208 S (T)
enclosures is recessed to protect the ports from
harm. On these enclosures, you’ll find two Speakon
NL 4 connectors. Both ports’ four pins are wired in
parallel. Pin assignments are:
pin 1+ = mid/high +, 1- = mid/high -,
2+ = sub +, 2- = sub 2-.

CDR 208 S and CDR 208 T Enclosures’
Technical Data

Power handling (RMS): 500 watts
Power handling (program): 1,000 watts
Impedance: 8 ohms
Chassis: 2x 8" / 1.4" B&C

Frequency range (±3 dB): 88 Hz to 16 kHz
Frequency range (-10 dB): 75 Hz to 19 kHz

SPL (1W / 1m, half-space): 108 dB
SPL (maximum, half-space) *): 138 dB @ 10 % THD
SPL (peak, half-space) *): 146 dB

Crossover frequency: 800 Hz
Horizontal dispersion: 80°, constant directivity
Vertical dispersion: Depends on the no. of stacked
enclosures and curving configuration

Connections

Ports: 2 Speakon NL 4 ports, wired in parallel
Pin assignments: 1+ = mid/high +, 1- = mid/high,
2+ = sub +, 2- = sub 2-

Housing

Material: 19-mm, 13-ply birch plywood
Coating: Black acrylic enamel
Handles: Two slot grips on the sides
Rigging hardware: Integrated side and rear rigging
attachments with quick-release pins.

Weight:

CDR 208 T 30 kg 66 lbs.
CDR 208 S 30 kg 66 lbs.

Dimensions (W x H x D):

CDR 208 T: 65 x 25.5 x 60 [cm]

25 10/16" x 10 1/16" x 23 10/16" [inch]

CDR 208 S: 65 x 24 x 60 [cm]

25 10/16" x 9 8/16" x 23 10/16" [inch]

*) Specifications refer to a cluster of four Cohedra
components.

Figure 1: Cohedra CDR 208 T

Figure 2: Cohedra CDR 208 S

B - 3

1.2 CDR 210 Sub Subwoofer

Design and Construction of the Subwoofer

The CDR 210 Sub enclosure is made of 19 mm,
13-ply birch plywood and coated with water-repel­lent, black acrylic enamel. The baffle board cover
consists of a metal grille.
The CDR 210 Sub weighs 33 kg.
It is 110 cm wide, 32 high and 40 cm deep.
Two slot grips have been routed into the side panels
for easy transport and set-up.

Electrical and Acoustical Data

The CDR 210 Sub enclosure features two 10" woofers.
The loudspeakers are treated with a special coating
protecting them against dirt and moisture.

The CDR 210 Sub enclosure’s nominal electrical
power-handling capacity is 600 watts RMS at 8 ohms
impedance. It produces a sound pressure level of
104 dB (1W@1m), measured under half-space con­ditions. Maximum SPL measured under the same
conditions at a distance of one meter is 139 dB
at 10% THD. The frequency response of the
CDR 210 Sub ranges from 47Hz to fx (+/-3 dB).

Connections

The connector panel on the rear of the CDR 210 Sub
enclosure is recessed to protect the ports from
harm. On this enclosure, you’ll find two Speakon
NL 4 connectors. Both ports’ four pins are wired
in parallel. Pin assignments are:
pin 1+ = mid/high +, 1- = mid/high -,
2+ = sub +, 2- = sub 2-.

The Cohedra CDR 210 Sub Subwoofer’s
Technical Data

Power handling (RMS): 600 Watt
Power handling (program): 1200 Watt
Impedance: 8 ohms
Chassis: 2x 10”

Frequency range (±3 dB): 47 Hz to f

x

Frequency range (-10 dB): 39 Hz to f

x

SPL (1W / 1m, half-space): 104 dB
SPL (maximum, half-space) *): 139 dB @ 10% THD
SPL (peak, half-space) *): 142 dB

Connections

Ports: 2 Speakon NL 4 ports, wired in parallel
Pin assignments: 1+ = mid/high +, 1- = mid/high -,
2+ = sub +, 2- = sub 2-

Housing

Material: 19-mm, 13-ply birch plywood
Coating: Black acrylic enamel
Handles: Two slot grips on the sides

Weight:

33 kg

Dimensions (W x H x D):

110 cm x 32 cm x 40 cm
43 2/16" x 12 4/16" x 15 5/16"

*) Specifications refer to a cluster of four
COHEDRA™ components.

Version 2.0

Figure 3: Cohedra CDR 210 Sub

Cohedra™ Manual

The Cohedra™ Loudspeakers

1.3 The CDR 210 F Sub Subwoofer

Design and Construction of the Subwoofer

The CDR 210 F Sub’s enclosure is made of 19 mm,
13-ply birch plywood and coated with water-repellent,
black acrylic enamel. The baffle board cover consists
of a metal grille.
The CDR 210 F Sub weighs 40 kg. It is 65.5 cm wide,
48 cm high and 60 cm deep. Two slot grips have
been routed into the side panels for easy transport
and set-up.

Electrical and Acoustical Data

The CDR 210 F Sub enclosure features two
10" woofers. The enclosures are provided with
a special coating that protects them against dirt
and water.

The CDR 210 F Sub enclosure’s nominal electrical
power-handling capacity is 600 watts RMS at 8 ohms
impedance. It produces a sound pressure level of
104 dB (1W@1m), measured under half-space
conditions. Maximum SPL measured under the same
conditions at a distance of one meter is 139 dB at
10% THD. Frequency response ranges from 47 Hz
to fx(+/-3 dB).

Connections

The connector panel on the rear of the CDR 210 F Sub
is recessed to protect the ports from harm. On these
enclosures, you’ll find two Speakon NL 4 connectors.
Both ports’ four pins are wired in parallel.
Pin assignments are pin 1+ = mid/high +,
1- = mid/high -, 2+ = sub +, 2- = sub 2-.

The CDR 210 F Sub Enclosure’s Technical Data

Power handling (RMS): 600 watts
Power handling (program): 1200 watts
Frequency range (±3 dB): 47 Hz to f

x

Frequency range (-10 dB): 39 Hz to f

x

SPL (1W / 1m, half-space): 104 dB
SPL (maximum, half-space) *): 139 dB @ 10% THD
SPL (peak, half-space) *): 142 dB
Impedance: 8 ohms
Chassis: 2 x 10"

Connections

Ports: 2 Speakon NL 4 ports, wired in parallel
Pin assignments: + = mid/high +, 1- = mid/high -,
2+ = sub +, 2- = sub 2- 2-

Housing

Material: 19-mm, 13-ply birch plywood
Coating: Black acrylic enamel
Handles: Two slot grips on the sides
Weight: 40 kg/ 88 lbs.
Dimensions (W x H x D): 65.5 cm x 48.2 cm x 60 cm

25 3/4" x 20" x 23 5/8"

*) Measured using four 4 CDR 210 F Sub enclosures.

Figure 4: Cohedra CDR 210 F Sub

B - 5Version 2.0

Cohedra™ Manual

Chapter C

The COHEDRA™ Transport Solution

MS D-1139 B 08/04

Content

The COHEDRA™ Transport Solution . . . . . . . . . . . 2

1.1 Mid/High Enclosures 2

1.2 Subwoofers 2

1.3 Dimensions and Weights of the Cases

and Bass Bin Dollies 2

Technical Data of the Subwoofer Dolly . . . . . . . . . 2

1.4 COHEDRA™ Truck Space 2

Index of Figures:

Figure 1: COHEDRA™ Mid/ High- Case 2
Figure 2: COHEDRA™ Subwoofer- Dolly 2
Figure 3: 16 Mid/ High- Cabinets

and 16 Subwoofers 3

Figure 4: 24 Mid/ High- Cabinets

and 24 Subwoofers 3

Figure 5: 32 Mid/ High- Cabinets

and 32 Subwoofers 4

Figure 6: 48 Mid/ High- Cabinets

and 48 Subwoofers 4

Version 2.0 C - 1

Cohedra™ Manual

Transport Solution

The COHEDRA™
Transport Solution

1.1 Mid/High Enclosures

A specially designed case serves to transport the
COHEDRA™ CDR 208 S, CDR 208 T mid/high and
the CDR 210 F Sub enclosures.
The floor of the mid/high enclosure case is adjustable
to 0° and 4.5°. This enables you to configure the S
and T model housing as desired without having to
disassemble clusters consisting of up to four
mid/high enclosures for transport.

1.2 Subwoofers

Serving to transport subwoofers is a dolly designed
to carry four stacked subwoofers. Subwoofers are
secured to the dolly using a cargo strap.

1.3 Dimensions and Weights of
the Cases and Bass Bin Dollies:

Case for four CDR 208s or two CDR 210 F Sub:

Width: 80 cm (31 1/2")
Depth: 74 cm (29 1/8")
Height: 131 cm (51 5/8")
Weight: approx. 150 kg (330 lbs.)

Four CDR 210 Subs with dolly and strap:

Height: 148 cm (58 1/4"), casters included
Width: 40 cm (15 3/4")
Depth: 110 cm (43 1/4")
Weight: 138 kg (304 lbs.)

PR 16 (lying):

Width: 60 cm (23 5/8")
Height: 65.5 cm (25 3/4") (depth, when standing
on casters)
Depth: 95 cm (37 3/8") (height, when standing
on casters)
Weight: approx. 125 kg (275 lbs.)

PR 8 (lying):

Width: 60 cm (23 5/8")
Height: 38.5 cm (15 3/16") (depth, when standing
on casters)
Depth: 95 cm (37 3/8") (height, when standing
on casters)
Weight: approx. 65 kg (143 lbs.)

Flying Hardware Case (on casters):

Width: 120 cm (47 1/4")
Depth: 80 cm (31 1/2")
Height: 58 cm (22 3/4")
Weight: approx. 90 kg (198 lbs.)

1.4 COHEDRA™ Truck Space

The dimensions of COHEDRA™ cases, racks and
dollies were selected specifically to make the most
of available truck space. The diagrams below offer
suggestions on how to load different COHEDRA™
systems into a truck with a width of 240 cm.

Figure 1: COHEDRA™ Mid/ High Case

Figure 2: COHEDRA™ Subwoofer Dolly

C - 3Version 2.0

Figure 3: 16 mid/high enclosures and 16 subwoofers Figure 4: 24 mid/high enclosures and 24 subwoofers

Cohedra™ Manual

Transport Solution

Figure 5: 32 mid/high enclosures and 32 subwoofers Figure 6: 48 mid/high enclosures and 48 subwoofers

C - 5Version 2.0

Cohedra™ Manual

Chapter D

Rigging and Curving COHEDRA™ System

MS D-1139 C 08/04

Content

Rigging and Curving COHEDRA™

Mid/high Cabinets . . . . . . . . . . . . . . . . . . . . . . . . 2

1 Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.1 Intended Use 2

1.2 Unintended Use 2

2Warranty and Liability . . . . . . . . . . . . . . . . . . 2

3 Important Notes on Safety . . . . . . . . . . . . . . 2

3.1 Responsibilities of the Operator 2

3.2 Storage, Maintenance, Inspection and

Repair of COHEDRA™ Rigging Hardware 3

3.3 Technical Specifications of

the COHEDRA™ Rigging Hardware 3

3.4 Maximum Permissible Number

of Flown COHEDRA™ Mid/High Units 3

3.5 Maximum Number of Flown

COHEDRA™ CDR 210 F Subwoofers 4

3.6 Ground-stacked Mid/High Enclosures 4

3.7 Pick Points for Flying

COHEDRA™ Mid/high Enclosures 4

3.8 Structural Modifications of

COHEDRA™ Rigging Hardware 4

3.9 Original HK AUDIO

®

Accessories: 4

3.10 Initiation and Operation 4

4Components of the

COHEDRA™ Rigging Hardware . . . . . . . . . . 5

5 Determining the Curving Angle between

Two COHEDRA™ Mid/High Enclosures . . . . 6

6 Preparations . . . . . . . . . . . . . . . . . . . . . . . . . 6

7 Mounting the Top Rigging Frame . . . . . . . . . 7

8 Mounting Additional

COHEDRA™ Mid/High Enclosures . . . . . . . 9

9 Attaching the Bottom Rigging Frame

and Raising the Mid/high Array . . . . . . . . . 10

10 Ground Stacking . . . . . . . . . . . . . . . . . . . . . 11

11 Setting up Subwoofers . . . . . . . . . . . . . . . . 12

11.1 Sub Array 12

11.2 Bass Cluster/ Stacking 13

11.3 Bass Clusters in Blocks 13

12 Flying CDR 210 F Subs . . . . . . . . . . . . . . . . 14

13 The SL 218 as a Bass Supplement . . . . . . . . 14

14 Operating the System . . . . . . . . . . . . . . . . . 14

15 Disassembling and Removing the System . . 15

Index of Figures:

Figure 1: 12 COHEDRA™ mid/high enclosures 5
Figure 2: Mid/high enclosure with

integrated flight attachments 5
Figure 3: Top rigging frame 5
Figure 4: Shackles for attaching motors, straps 5
Figure 5: Bottom rigging frame 5
Figure 6: Lashing strap for curving the array 5
Figure 7: Quick-release pin 5
Figure 8: The curvature between two

COHEDRA™ mid/high enclosures 6
Figure 9: Setting the curving angle on a

flown array 6
Figure 10: Connector component attached

on the top rigging frame for

a 0 ° curving angle 6
Figure 11: Open case with four mid/high

range enclosures 7
Figure 12: Turning the connector component 7
Figure 13: Mounting the top rigging frame 7
Figure 14: Mounting the main motor to

the top rigging frame 8
Figure 15: Setting the curving angle between

COHEDRA™ mid/high enclosures 8
Figure 16: Hoisting the top four

COHEDRA™ mid/high enclosures 9
Figure 17
a, b, c, d: Mounting additional

mid/high enclosures 9
Figure 18: Mounting the bottom rigging frame 10
Figure 19
a, b: Attaching the lashing strap /

second motor between the top

and bottom rigging frames 10
Figure 20
a, b: Hoisting the fully assembled

COHEDRA™ mid/high array 10
Figure 21: Groundstack with CDR 210 F Sub

and CDR 208 S/T 11
Figure 22: CDR 210 sub array 12
Figure 23: CDR 210 sub cluster 13
Figure 24: CDR 210 sub cluster in blocks 13
Figure 25: Flown CDR 210 F bass array

next to mid/high array 14
Figure 26: The CDR 210 F Sub’s curving angle 14
Figure 27: Pin assignment of channels 1-4 14

Index of Tables:

Table 1: Weight of mid/high enclosures 3
Table 2: Weight of CDR 210 F Sub 4

Version 2.0 D - 1

Cohedra™ Manual

Rigging and Curving COHEDRA™ System

Rigging and Curving
COHEDRA™ Mid/high
Cabinets

Please read these instructions carefully before you
begin setting up the system!

1 Use

1.1 Intended Use

Specifications for intended use include the following:

• When mounting mid/high range enclosures, make
sure that the load is centreed directly under the
suspension point on the rigging frame.

• The rigging frame may not be tilted more than
10% (that is, at angles greater than 6°). Note that
the specifications for intended use require you to
read and heed all of the operating instructions and
comply with inspection and maintenance require­ments.

Any use other than specified is unintended.
The manufacturer shall not be liable for damages
resulting from unintended use.

1.2 Unintended Use

Improper use of rigging frames and incorrect
handling of this load-carrying equipment can pose
a serious danger.
Never

• use rigging frames to exert diagonal force or ten­sion on loads,

• use a crane to dislodge stuck or immovable loads,

• lift people,

• strike, knock or dent rigging frames,

• heat-treat or weld rigging frames,

• exceed the truss’s maximum load-carrying capacity

Note that in addition to the above specifications,
the operational safety regulations of VBG 9 (the
German employers’ liability insurance association
accident prevention regulations) apply.

2 Warranty and Liability

HK AUDIO®cannot be held responsible for damages
due to improper use or non-compliance with the
safety specifications for setup and operation.
All warranty and liability claims for personal injury
and property damages are excluded if attributable
to one or several of the following:

• non-compliance with operating manual instruc­tions, voiding product liability and warranty claims

• unintended use of rigging frames

• non-compliance with operating manual instructions
regarding transportation, storage, initial setup,
operation, maintenance and repair of rigging frames

• unauthorized structural modifications performed
on rigging frames

• unauthorized modification of the parameters indi­cated in the operating manual

• inadequate or improper repairs

3 Important Notes
on Safety

Original COHEDRA™ rigging accessories have been
certified as a complete and cohesive system by the
safety standards authority TÜV. The directions for
use of the COHEDRA ™ rigging system require that
it be installed in accordance with the following spe­cifications. Before you begin installation, ensure
that the mounting points (for example, a chain hoist)
on the stage roof or the venue’s ceiling comply with
BGV-C1 accident prevention regulations and that
the safety standards authority TÜV has certified
them for the full load (see table 1). Prior to every
installation, inspect all components to ensure they
are in good operating condition, taking particular
care to confirm that all quick-release pins and hard­ware connectors are undamaged.

The principle requirement for safe handling
and trouble-free operation of rigging frames is
a thorough understanding of the basic notes on
safety and the safety regulations.
This operating manual contains key rules on safe
handling.

3.1 Responsibilities of

the Operator

As the operator, you are legally bound to allow only
those persons to work with rigging frames who are

• 16 years of age or older,

• physically and mentally able, familiar with the basic
rules of industrial safety and accident prevention,
and trained in the handling of rigging frames.

Be sure to regularly review and confirm personnel’s
safety awareness.
In addition, task personnel with specific responsibi­lities for setting up, putting into service, operating,
maintaining, and repairing equipment. Ensure that
personnel are trained to work with the rigging frame
only under the supervision of a proficient and expe­rienced technician. Ensure also that defects, flaws
and other damage that could impede safety are
repaired immediately.

D - 3Version 2.0

3.2 Storage, Maintenance,
Inspection and Repair of
COHEDRA™ Rigging Hardware

Storage, temporary and long-term

When not in use store the truss indoors in a safe
place where it cannot be tipped over and is protect
from exposure to the elements.

Inspections

§ 39, VBG 9 A of the German employers’ liability in­surance association accident prevention regulations
requires that load-carrying equipment be inspected
by a qualified expert and possible defects be elimi­nated prior to initial commissioning by the recipient.

§ 40, VBG 9 A requires that load-carrying equipment
be inspected at least annually for cracks.
When used in dynamic applications, equipment
must be inspected for cracks every six months.

Maintenance

You are authorized to replace easily serviceable
wearing or standard parts in accordance with the
manufacturer’s instructions. Use original parts for
this purpose.
If necessary, tighten screws and screwed connections.

Repair

In the event that parts of the load-carrying equipment
have been deformed, it is up to the manufacturer to
determine if they are repairable.
Solely the manufacturer is authorized to perform
welding and repair jobs on load-carrying equipment.

3.3 Technical Specifications
of the COHEDRA™ Rigging
Hardware

Load-carrying capacity of standard rigging frames:
800 kg
Test load: 3,200 kg
Ambient temperature when in operation:
min. –10° C, max. + 60° C

3.4 Maximum Permissible
Number of Flown COHEDRA™
Mid/High Units

• You may fly up to 32 mid/high range enclosures in
a stacked array.

• You may fly up to 24 mid/high enclosures in a
stacked array when using the standard rigging fra­me.

• If you want to fly up to 32 mid/high enclosures,
you must use the high-load rigging frame! It is
available on demand.

Warning: Flying more than 24 enclosures in a stacked
array from the standard rigging frame voids the
safety standards authority TÜV’s certification!

Refer to table 1 to determine flown loads. The sum
of the weights of COHEDRA™ mid/high enclosures
plus the weight of the rigging frames equals the
total load.

Note: Ensure that you add the weights of chain
hoists, motors, cables and further stops to determine
total weight!

Quantity Weight [kg] Weight [lbs.]

130 66
260 132
3 90 198
4 120 264
5 150 330
6 180 396
7 210 462
8 240 528
9 270 594
10 300 660
11 330 726
12 360 792
13 390 858
14 420 924
15 450 990
16 480 1056
17 510 1122
18 540 1188
19 570 1254
20 600 1320
21 630 1386
22 660 1452
23 690 1518
24 720 1584
25 750 1650
26 780 1716
27 810 1782
28 840 1848
29 870 1914
30 900 1980
31 930 2046
32 960 2112

Top and bottom rigging frame with shackle:
30 kg/ 66 lbs.

Table 1: Weight of mid/high enclosures

Cohedra™ Manual

Rigging and Curving COHEDRA™ System

3.5 Maximum Number
of Flown COHEDRA™
CDR 210 F Subwoofers

The standard rigging frame can fly up to 20 vertically
arrayed CDR 210 F Subs.
If you are using a combination of CDR 208 S/T
cabinets and CDR 210 F Sub bins on one rigging
frame, calculate the total load using both tables.
Ensure the rigging frame’s maximum permissible
load is never exceeded.

Number Weight [kg] Weight [lbs.]

140 88
280 176
3 120 264
4 160 352
5 200 440
6 240 528
7 270 616
8 310 704
9 350 792
10 390 880
11 430 968
12 470 1056
13 510 1144
14 550 1232
15 590 1320
16 630 1408
17 670 1496
18 710 1584
19 750 1672
20 790 1760

Table 1: Weight of the CDR 210 F Sub

3.6 Ground-stacked Mid/High
Enclosures

Ensure that the (inverted) top rigging frame is placed
securely on the ground or stage. Secure the mid/high
stack to prevent slippage!

3.7 Pick Points for Flying
COHEDRA™ Mid/high
Enclosures

Use only the top rigging frame’s shackles to attach
motors, chain hoists and straps. Insert them into
the eyelets in the centre rail designed to accept
shackles!
Never use the round pole on the top rigging frame
to attach shackles or mount motors! This pole is
used only for guiding and securing cables.
Use only the bottom rigging frame to curve the array.
Clear the area immediately below arrays of people
before raising or lowering loads.
Lift and lower flown mid/high enclosures smoothly,
avoiding abrupt stops or jerky motions.
Secure the flown mid/high array in place with straps
so that it remains immovable, for example, despite
gusts of wind. Use the eyelets in the bottom rigging
frame to affix straps.

3.8 Structural Modifications
of COHEDRA™ Rigging
Hardware

No structural modifications may be made without
the manufacturer’s permission. This also applies
to welding work performed on supporting parts.
Structural alterations require the manufacturer’s
written approval. Use original replacement and
wearing parts only.

3.9 Original HK AUDIO

®

Accessories:

Use original HK AUDIO®parts only (see section 4)!
The safety standards authority TÜV has not certified
any other parts for use! Always install parts in ac­cordance with these installation instructions! Com­pile and store all documents pertaining to the sy­stem in a safe place!

3.10 Initiation and Operation

§ 39, VBG 9 A of the German employers’ liability in­surance association accident prevention regulations
requires that load-carrying equipment be inspected
by a qualified expert and possible defects be elimi­nated prior to initial commissioning by the reci­pient.

§ 41 VBG 9a requires that load-carrying equipment
be subjected to a non-routine inspection following
damage, repair work and other incidents that can
affect load-carrying capacity.

D - 5Version 2.0

4 Components of the
COHEDRA™ Rigging
Hardware

COHEDRA™ rigging hardware consists of the
following parts:

• a top rigging frame with three shackles for attaching
motors, lashing straps or chain hoists.
The top rigging frame also serves as the base for
ground stacks.

• a bottom rigging frame for attaching a lashing
strap, chain hoist or motor for curving the array

• a two-part lashing strap for curving arrays of up to
eight COHEDRA™ mid/high enclosures

• integrated attachments on the side and back for
flying COHEDRA™ mid/high enclosures

• four quick-release pins per mid/high enclosure for
connecting enclosures to the rigging frames

Figure 1: 12 COHEDRA™ mid/high enclosures

Figure 2: Mid/high enclosure with integrated flight

attachments

Figure 3: Top rigging frame

Figure 4: Shackles for attaching motors, straps

Figure 5: Bottom rigging frame

Figure 7: Quick-release pin

Figure 6: Lashing strap for curving the array

Cohedra™ Manual

Rigging and Curving COHEDRA™ System

5 Determining the
Curving Angle between
Two COHEDRA™
Mid/High Enclosures

The curving angle between two enclosures is set by
simply adjusting one pin. One person can easily
carry out the entire process of curving cabinets.

The maximum adjustable angle depends on how
the mid/high range enclosures are configured in a
flown stacked array. Two different housing designs
are available for optimizing the gap between two
mid/high range enclosures, the straight variant
CDR 208 S (S stands for straight) and the slanted
variant CDR 208 T ( T is short for trapezoidal).
Both COHEDRA™ mid/high enclosures (the
CDR 208 T and the CDR 208 S) are labeled uniform­ly to provide information on the adjustable angle:
The left side of the connector panel designates the
angle if the top enclosure is a CDR 208 S. On the
right is designated the angle if the top enclosure is
a CDR 208 T (see Figure 8 a, b).
If two CDR 208 S enclosures are configured in a
flown stacked array, your only option is 0°.
If one CDR 208 S and one CDR 208 T enclosure
each are configured in a flown stacked array, you
can opt for 0 °, 1.5°, 3 °, or 4.5 °.
If two CDR 208 T enclosures are configured in a
flown stacked array, you can opt for 4.5°, 6°, 7.5° or
9 °. This variant is an excellent choice when you
want to configure sharply curving down-fills.

The rigging equipment is designed so that the cur­ving angle can still be adjusted when COHEDRA™
mid/high arrays are flown (see Figure 9).

How is this done?

The pin that determines the curving angle (the top
pin on mid/high range enclosures) is merely a pre­defined stop for the flexible connector component
when the entire COHEDRA ™ mid/high array is pul­led together accordion-style and thereby adjusted
using a lashing strap, chain hoist or motor attached
at the back. If no force is exerted, the entire
mid/high array is suspended at 0°, meaning that
the pin is easily repositioned!

Important note: If you first mount a CDR 208 S en­closure to the top rigging frame - that is, configure
two CDR 208 S mid/high enclosures in a flown stacked
array - you must insert the back pin into both the
eyelet labeled 0° and through the connector com­ponent’s slot (see Figure 10)! Otherwise, the angle
will be set incorrectly and you will not be able to
curve the array as desired!
For every other configuration, do not insert the pin
into the slot!

6 Preparations

The following section describes how to set up a basic
mid/high array. Use the COHEDRA™ CAPS software
to select on the top rigging frame pick points for
determining the angles between the mid/high
enclosures.

Move the open case with the four mid/high
enclosures in position.

Figure 9: Setting the curving angle on a flown array

Figure 10: Connector component attached o the top

rigging frame for a 0 ° curving angle

Figure 8: The curvature between two COHEDRA™

mid/high enclosures

Figure 8: The curvature between two COHEDRA™

mid/high enclosures