CX Series USER MANUAL w w CX4 CX4T w CX6 w CX6T w CX12 Rev. B *TD-000057-00* w CX12T *TD-000057-00* 31 Table of Contents PART 1--CX SERIES USER MANUAL I. Warning Notices ....................................................................................................................................... 2 Speaker Damage ............................................................................................................................................ 3 Speaker Output Shock Hazard ....................................................................................................................... 3 Rack Mounting Precautions ........................................................................................................................... 3 II. Overall Description ................................................................................................................................... 4 III. Inputs ............................................................................................................................................................ 6 Input Sensitivities .......................................................................................................................................... 6 IV. Outputs ......................................................................................................................................................... 6 V. Controls & Displays ................................................................................................................................... 8 AC Power ....................................................................................................................................................... 8 Operation ....................................................................................................................................................... 8 Troubleshooting ............................................................................................................................................. 9 Open Input ArchitectureTM Level I ................................................................................................................. 10 Parallel, Stereo, or Bridged Operation ....................................................................................................... 11 Maximum Long-Term Output Power ........................................................................................................... 13 AC Current Consumption ............................................................................................................................. 13 Heat Emissions ............................................................................................................................................. 14 Protection Circuits ....................................................................................................................................... 15 VII. Specifications .......................................................................................................................................... 16 VI. Operation ..................................................................................................................................................... 8 PART 2--CX APPLICATION GUIDE ..................................................................................19 VIII. Distributed Lines ..................................................................................................................................... 19 IX. Designing the Distributed Sound System .......................................................................................... 20 Loudspeaker Coverage and Placement ....................................................................................................... 20 Determining Power Levels ........................................................................................................................... 22 Selecting the Amplifier ............................................................................................................................... 23 Using Components with Different Voltages ............................................................................................... 24 X. How Many Speakers? ............................................................................................................................. 25 Speaker Transformer Saturation ................................................................................................................ 26 Connecting Both a Distributed Line and a Direct Loudspeaker on One Channel ...................................... 26 Wire Loss ..................................................................................................................................................... 27 AC Current Consumption ............................................................................................................................. 29 Heat Emissions ............................................................................................................................................. 29 XII. Address & Telephone Information ...................................................................................................... 30 XI. Other Design Considerations ................................................................................................................ 26 1 EXPLANATION OF GRAPHICAL SYMBOLS The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to humans. The exclamation point within an equilateral triangle is intended to alert the users to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: To reduce the risk of electric shock, do not remove the cover. No user-serviceable parts inside. Refer servicing to qualified service personnel. WARNING: To prevent fire or electric shock, do not expose this equipment to rain or moisture. AVIS RISQUE DE CHOC ÉLECTRIQUE NE PAS OUVRIR EXPLICATION DES SYMBOLES GRAPHIQUES Le symbole éclair avec point de flèche à l'intrérieur d'un triangle équilatéral est utilisé pour alerter l'utilisateur de la presence à l'intérieur du coffret de "voltage dangereux" non isolé d'ampleur suffisante pour constituer un risque d'elétrocution. Le point d'exclamation à l'intérieur d'un triangle équilatéral est employé pour alerter les utilisateurs de la présence d'instructions importantes pour le fonctionnement et l'entretien (service) dans le livret d'instruction accompagnant l'appareil. ATTENTION: Pour eviter les risques de choc électrique, ne pas enlever le courvercle. Aucun entretien de pièces intérieures par l'usager. Confier l'entretien au personnel qualifié. AVIS: Pour eviter les risques d'incendie ou d'électrocution, n'exposez pas cet article à la pluie ou a l'humidité. VORSICHT GEFAHR EINES ELEKTRISCHEN SCHLAGES. NICHT ÖFFNEN! ERKLÄRUNG DER GRAPHISCHEN SYMBOLE Der Blitz nach unten zeigendem Pfeil in einem gleichseitigen Dreieck weist den Benutzer auf das Vorhandensein einer unisolierten, gefährlichen " Spannung" im Gehäuse hin, die stark sein kann, einer Person einen elektrischen Schlag zu versetzen. Das Ausrufzeichen in einem gleichseitigen Dreieck weist den Benutzer auf wichtige Betriebs- und Wartungs- vorschriften in den beiliegenden Unterlagen des Gerätes hin. VORSICHT: Um das Risiko eines elektrischen Schlages zu vermindern, Abdeckung nicht entfernen! Keine Benutzer Wartungsteile im Innern. Wartung nur durch qualifiertes Wartungspersonal. WARNUNG: Zur vermeidung von Feuer oder elektrischen Schlägen, das Gerät nicht mit Regen oder Feuchtigkeit in Berührung bringen! SAFEGUARDS Electrical energy can perform many useful functions. This unit has been engineered and manufactured to assure your personal safety. Improper use can result in potential electrical shock or fire hazards. In order not to defeat the safeguards, observe the following instructions for its installation, use and servicing. DECLARATION OF CONFORMITY for all CX and CXT models We declare as our sole responsibility that this product is in compliance with the EMC Directive 89/336/EEC and conforms to the requirements of the Harmonized Product Standards EN 55013 (Product Emissions), and EN 55020 (Product Immunity). PRECAUTIONS L'énergie électrique peut remplir de nombreuses fonctions utiles. Cet appariel a été conçu et réalisé pour assurer une sécurité personnelle entiére. Une utilisation impropre peut entraîner des risques d'électrocution ou d'incendie. Dans le but de ne pas rendre inutiles les mesures de sécurité, bien observer les instructions suivantes pour l'installation, l'utilisation et l'entretien de l'appareil. 2 I. Warning Notices SPEAKER DAMAGE The CX Series amplifiers are among the most powerful professional amplifiers available and are capable of producing much more power than many loudspeakers can handle. It is the user's responsibility to use suitable speakers with the amplifier and to use them in a sensible way that will not cause damage. QSC will not be responsible for blown speakers. Consult the speaker manufacturer for power-handling recommendations. Even if you reduce the gain using the amplifier's rear panel attenuator controls, it is still possible to reach full output power if the input signal level is high enough. A single high-power crescendo can blow high-frequency speaker drivers almost instantaneously, while lowfrequency drivers can usually withstand very high, continuous power levels for a few seconds before they too die. Reduce power immediately if you hear any speaker "bottoming out"-harsh pops or cracking distortion that indicate that the speaker voice coil or diaphragm is striking the magnet assembly. QSC recommends that you use amplifiers of this power range for more headroom (cleaner sound) rather than for increased volume. SPEAKER OUTPUT SHOCK HAZARD A CX amplifier is capable of producing hazardous output voltages. To avoid electrical shock, make sure the cover is in place over the output terminals, and do not touch any exposed speaker wiring while the amplifier is operating. RACK MOUNTING PRECAUTIONS To minimize twisting stress on the front mounting ears, the amplifier's internally mounted output transformers are located close to the front panel. Nevertheless, when rack mounting any CX amplifier, make sure it is well supported at all four corners to avoid damage to either the amplifier mounting ears or the mounting rails. Contact the QSC Technical Services Department to order rear support brackets. LIFTING PRECAUTIONS In order to safely move or install the amplifier, it is recommended that two persons share the weight when lifting and positioning the unit. SICHERHEITSVORSCHRIFTEN BEIM HOCHHEBEN Um den Verstärker sicher zu verschieben oder einzubauen, wird empfohlen, das Gewicht des Verstärkers beim Hochheben und Verschieben gleichmäßig auf zwei Personen zu verteilen. Optional rear rack mounting ears. 3 II. Overall Description The CX Series from QSC comprises six high-efficiency professional power amplifier models, each with two independent channels. The table below lists the range's audio power ratings. MODEL CX4 CX4T CX6 CX6T CX12 CX12T 1: 2: 3: 4: 81 150 watts 150 watts 200 watts 200 watts 425 watts 425 watts 41 225 watts 225 watts 300 watts 300 watts 600 watts 600 watts 22 350 watts 350 watts 450 watts 450 watts 900 watts 900 watts 25 volts3 70 volts1 100 volts1 150 watts4 175 watts4 175 watts4 200 watts3 250 watts3 250 watts3 400 watts3 500 watts3 500 watts3 FTC watts per channel, 20 Hz­20 kHz, 0.1% THD EIA watts per channel, 1 kHz, 1% THD Watts per channel, 45 Hz-15 kHz, 0.25% THD Watts per channel, 50 Hz-15 kHz, 0.25% THD Each channel has its own power transformer secondary. The CX4, CX4T, CX6 and CX6T utilize complementary Class AB linear output circuitry. For improved efficiency, the CX12 and CX12T utilize Class H step linear complementary output circuitry and have bipolar multi-rail power supplies. The power transformers, as are the output transformers, are mounted in the front of the amplifier chassis, as close to the front mounting rails as possible; this keeps the unit's center of gravity forward to minimize the twisting force on the front mounting ears. Still, the amplifier should be supported at all four corners, especially if it is in a MODEL portable rack. CX4 The CX4 and CX4T are two rack spaces high; the CX6, CX6T, CX12, and CX12T are three rack spaces CX4T high. The adjacent table lists the amplifiers' weights by model. The amplifiers require a rack depth of 18 ...