DBX AFS Owner's Manual [fr]
Mode d’emploi
Suppresseur de Larsen avancé à deux canaux
AFS
™
224
WARNING FOR YOUR PROTECTION
READ THESE INSTRUCTIONS:
KEEP THESE INSTRUCTIONS
HEED ALL WARNINGS
FOLLOW ALL INSTRUCTIONS
DO NOT USE THIS APPARATUS NEAR WATER
CLEAN ONLY WITH A DRY CLOTH.
DO NOT BLOCK ANY OF THE VENTILATION OPENINGS. INSTALL IN ACCORDANCE WITH
THE MANUFACTURER’S INSTRUCTIONS.
DO NOT INSTALL NEAR ANY HEAT SOURCES SUCH AS RADIATORS, HEAT REGISTERS,
STOVES, OR OTHER APPARATUS (INCLUDING AMPLIFIERS) THAT PRODUCE HEA
T.
ONLY USE ATTACHMENTS/ACCESSORIES SPECIFIED BY THE MANUFACTURER.
UNPLUG THIS APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG
PERIODS OF TIME.
Do not defeat the safety purpose of the polarized or grounding-type plug. A
polarized plug has two blades with one wider than the other. A grounding type plug
has two blades and a third grounding prong. The wide blade or third prong are
provided for your safety. If the provided plug does not fit your outlet, consult an
electrician for replacement of the obsolete outlet.
Protect the power cord from being walked on or pinched particularly at plugs,
convenience receptacles, and the point where they exit from the apparatus.
Use only with the cart stand, tripod bracket, or table specified by the manufacture,
or sold with the apparatus. When a cart is used, use caution when moving the
cart/apparatus combination to avoid injury from tip-over.
Refer all servicing to to qualified service personnel. Servicing is required when
the apparatus has been damaged in any way, such as power-supply cord or plug is
damaged, liquid has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has
been dropped.
POWER ON/OFF SWITCH: For products provided with a power switch, the power
switch DOES NOT break the connection from the mains.
MAINS DISCONNECT: The plug shall remain readily operable. For rack-mount or
installation where plug is not accessible, an all-pole mains switch with a contact
separation of at least 3 mm in each pole shall be incorporated into the electrical
installation of the rack or building.
FOR UNITS EQUIPPED WITH EXTERNALLY ACCESSIBLE FUSE RECEPTACLE: Replace fuse
with same type and rating only.
MULTIPLE-INPUT VOLTAGE: This equipment may require the use of a different line
cord, attachment plug, or both, depending on the available power source at
installation. Connect this equipment only to the power source indicated on the
equipment rear panel. To reduce the risk of fire or electric shock, refer servicing
to qualified service personnel or equivalent.
This Equipment is intended for rack mount use only.
SAFETY INSTRUCTIONS
NOTICE FOR CUSTOMERS IF YOUR UNIT IS EQUIPPED
WITH A POWER CORD.
WARNING: THIS APPLIANCE MUST BE EARTHED.
The cores in the mains lead are coloured in accordance with
the following code:
GREEN and YELLOW - Earth BLUE - Neutral BROWN - Live
As colours of the cores in the mains lead of this appliance may
not correspond with the coloured markings identifying the
terminals in your plug, proceed as follows:
• The core which is coloured green and yellow must
be connected to the terminal in the plug marked
with the letter E, or with the earth symbol, or
coloured green, or green and yellow.
• The core which is coloured blue must be connected
to the terminal marked N or coloured black.
• The core which is coloured brown must be
connected to the terminal marked L or coloured
red.
This equipment may require the use of a different line cord,
attachment plug, or both, depending on the available power
source at installation. If the attachment plug needs to be
changed, refer servicing to qualified service personnel who
should refer to the table below. The green/yellow wire shall be
connected directly to the units chassis.
WARNING:If the ground is defeated, certain fault conditions in
the unit or in the system to which it is connected can result in
full line voltage between chassis and earth ground. Severe injury
or death can then result if the chassis and earth ground are
touched simultaneously.
The symbols shown above are internationally accepted
symbols that warn of potential hazards with electrical
products. The lightning flash with arrowpoint in an
equilateral triangle means that there are dangerous
voltages present within the unit. The exclamation point in
an equilateral triangle indicates that it is necessary for the
user to refer to the owner’s manual.
These symbols warn that there are no user serviceable
parts inside the unit. Do not open the unit. Do not
attempt to service the unit yourself. Refer all servicing to
qualified personnel. Opening the chassis for any reason
will void the manufacturer’s warranty. Do not get the unit
wet. If liquid is spilled on the unit, shut it off immediately
and take it to a dealer for service. Disconnect the unit
during storms to prevent damage.
IMPORTANT SAFETY INSTRUCTIONS
U.K. MAINS PLUG WARNING
A molded mains plug that has been cut off from the cord is unsafe.
Discard the mains plug at a suitable disposal facility. NEVER UNDER
ANY CIRCUMSTANCES SHOULD YOU INSERT A DAMAGED OR CUT
MAINS PLUG INTO A 13 AMP POWER SOCKET. Do not use the
mains plug without the fuse cover in place. Replacement fuse covers
can be obtained from your local retailer. Replacement fuses are 13
amps and MUST be ASTA approved
to BS1362.
IMPORTANT SAFETY INSTRUCTIONS
ELECTROMAGNETIC
COMPATIBILITY
This unit conforms to the Product
Specifications noted on the Declaration
of Conformity. Operation is subject to
the following two conditions:
• this device may not cause harmful
interference, and
• this device must accept any
interference received, including
interference that may cause
undesired operation.
Operation of this unit within significant
electromagnetic fields should be avoided.
• use only shielded interconnecting
cables.
DECLARATION OF
CONFORMITY
Manufacturer’s Name: dbx Professional Products
Manufacturer’s Address: 8760 S. Sandy Parkway
Sandy, Utah 84070, USA
declares that the product:
Product name: dbx AFS 224
Note: Product name may be suffixed by the
letters-EU.
Product option: None
conforms to the following Product Specifications:
Safety: IEC 60065 (1998)
EMC: EN 55013 (1990)
EN 55020 (1991)
Supplementary Information:
The product herewith complies with the requirements of the Low
Voltage Directive 72/23/EEC and the EMC Directive 89/336/EEC as
amended by Directive 93/68/EEC.
Vice-President of Engineering
8760 S. Sandy Parkway
Sandy, Utah 84070, USA
Date: June 9, 2003
European Contact: Your local dbx Sales and Service Office or
Harman Music Group
8760 South Sandy Parkway
Sandy, Utah
84070 USA
Ph: (801) 566-8800
Fax: (801) 568-7583
Ta b le des matières
AFS 224
Ta b le des matières
Présentation de l’AFS 224 .......................................i
Informations SAV ....................................................ii
Garantie...................................................................ii
Consignes d’installation..........................................1
Connexions simples ...............................................1
Face arrière - Description ......................................2
Face avant - Description ........................................2
Configuration utilisateur.........................................3
Applications ............................................................7
Synoptique ............................................................10
Caractéristiques techniques..................................11
AFS 224 - Mode d’emploi
Table des matières
AFS 224 - Utilisation
AFS 224
Introduction
AFS 224 - Mode d’emploi
i
AFS 224
Merci d’avoir fait confiance au processeur dbx Professional Products AFS 224. Le suppresseur
de Larsen avancé AFS 224 intègre les toutes dernières technologies de suppression de Larsen
sur une interface utilisateur claire et intuitive. Grâce à son module DSP puissant et à sa grande
ergonomie, l’AFS 224 vous offre tous les outils de traitement et toutes les possibilités de contrôle
nécessaires que ce soit en installation fixe ou sur scène. L’AFS 224 est un outil indispensable
pour toute application Live.
Les suppresseurs de Larsen à dix ou douze filtres sont aujourd’hui devenus légion, mais les
ingénieurs dbx n’aiment pas rester sur un statu quo. Ils ont donc décidé de relever le défi en
proposant un suppresseur de Larsen à 24 filtres par canal d’une largeur de bande pouvant
atteindre 1/80 d’octave. Pour obtenir de tels résultats, dbx a exploité sa technologie AFS
exclusive dont bénéficiaient jusqu’alors uniquement les appareils de très haut de gamme de la
marque. Outre la multitude de filtres anti-Larsen, l’AFS 224 propose également le choix du
mode d’action, la désactivation automatisée des filtres ainsi que le choix du type de filtrage,
toutes ces opérations étant réalisables directement en face avant. Le présent mode d’emploi
vous décrit en détails toutes les fonctionnalités et la puissance du processeur AFS 224.
Le dbx AFS 224 propose les fonctions suivantes :
• Technologie de suppression de Larsen exclusive
Advanced Feedback Suppression (AFS™)
• 24 filtres programmables par canal
• Traitement en mode stéréo ou en double canal
• Filtrage à action fixe ou automatique
• Désactivation automatisée des filtres
• Filtres spécifiques aux applications :Speech, Music Low/Med/High
• Afficheur de niveaux d’entrée
• Afficheur de filtres à 24 segments sur chaque canal
• Entrées et sorties symétriques sur XLR et jacks stéréo
Atouts de l’AFS 224
L’AFS 224 peut travailler en mode fixe ou automatique et peut même désactiver certains filtres,
ce qui en fait un appareil hors du commun. En mode automatique, l’appareil ajuste en
permanence le placement des filtres afin d’assurer une suppression de Larsen optimale au cours
d’une performance. La fonction Filter Lift découple automatiquement les filtres qui ne sont plus
utiles, ce qui permet de préserver toute l’intégrité du signal audio.
L’AFS 224 permet d’optimiser la suppression du Larsen. Autrefois, la suppression du Larsen était
dévolue aux égaliseurs graphiques. Cette méthode donnait des résultats acceptables, mais après
une analyse précise, les résultats montraient clairement qu’un simple curseur d’égalisation
1/3 d’octave pouvait réduire de moitié la puissance du signal. L’AFS élimine automatiquement
le Larsen et les filtres de précision exclusifs dbx ne suppriment qu’une fraction du spectre de
fréquences. Le schéma en page suivante compare l’AFS à d’autres suppresseurs de Larsen et aux
égaliseurs graphiques traditionnels :
Présentation de l’AFS 224
INTRODUCTION
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