Series One v v v v Model 1100 Model 1200 Model 1400 Model 1700 Owner's Manual ® A U D I O *TD-000027-00* Rev. C 1 Series One Power Amplifier Operation Manual TABLE OF CONTENTS I: INTRODUCTION 1.1 Welcome .................................................... 1.2 Warranty ..................................................... 1.3 Overview of Amplifier ................................. 1.4 Specifications ............................................. 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. 3 3 3 4 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. II: BASIC INSTRUCTIONS 2.1 Unpacking and Inspection .......................... 5 2.2 Important Precautions ................................ 5 2.3 Quick Instructions ....................................... 6 III: OPERATION 3.1 Cooling ....................................................... 8 3.2 AC Requirements ....................................... 9 3.3 Input Connections ...................................... 9 3.4 Octal Module Accessories ........................ 12 3.5 Input Switches and Mono Bridging ........... 12 3.6 Speaker Connections ............................... 13 3.7 25 and 70 Volt Systems ........................... 15 3.8 Protection Features .................................. 15 3.9 Operational Troubleshooting .................... 16 IV: SPEAKER PROTECTION 4.1 Background .............................................. 4.2 DC Protection ........................................... 4.3 Horn Driver Protection .............................. 4.4 Power Capacity ........................................ 4.5 Power Limiting .......................................... 4.6 User Responsibility .................................. V: MAINTENANCE AND SERVICE 5.1 Cleaning ................................................... 5.2 Dust Removal ........................................... 5.3 User Maintenance .................................... 5.4 Obtaining Service ..................................... EXPLICATION DES SYMBOLES GRAPHIQUES Le symbole èclair avec point de flèche à l'intrérieur d'un triangle équilatéral est utilisé pour alerter l'utilisateur de la présence 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. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: To reduce the rish 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. 18 18 18 19 19 19 AVIS RISQUE DE CHOCK ELECTRIQUE NE PAS OUVRIR ATTENTION: Pour enviter les risques de chock electrique, ne pas enlever le courvercle. Aucun entretien de pieces interieures par l'usager. Confier l'entretien au personnel qualifie. AVIS: Pour enviter les risques d'incendie ou d'electrocution, n'exposez pas cet article a la pluie ou a l'humidite. 20 20 20 20 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. 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. INTRODUCTION 1.1 WELCOME Thank you for selecting a QSC Series One power amplifier for your audio system. Our goal is to ensure your complete satisfaction with your amplifier purchase. Please do not hesitate to call your QSC Dealer or QSC Audio Products if you have any service problems or questions not answered in this manual. Your QSC Series One power amplifier can be readily operated by anyone familiar with professional audio systems. The four models covered by this manual, the 1100, 1200, 1400 and 1700, have similar features and connections. Any differences will be covered in the following detailed instruction sections of this manual. Because not all amplifier features and characteristics are standardized, we recommend that both experienced and first-time users review the contents of this manual. Please consult the table of contents for quick reference to sections of interest. We recommend that all users review the "Basic Instructions" section of this manual before installing or operating the amplifier. 1.2 WARRANTY AND DISCLAIMERS QSC Audio Products, Inc. is not liable for any damage to speakers, amplifiers, or any other equipment that is caused by negligence or improper installation and/or use of the Series One Amplifier. Product Warranty QSC Audio Products, Inc. guarantees the Series One Amplifier to be free from defective material and/or workmanship for a period of three years from date of sale, and will replace defective parts and repair malfunctioning products under this warranty when the defect occurs under normal installation and use--provided the unit is returned to our factory via prepaid transportation with proof of purchase (sales receipt). This warranty provides that examination of the returned product must disclose, in our judgement, a manufacturing defect. This warranty does not extend to any product which has been subject to misuse, neglect, accident, improper installation, or where the date code has been removed or defaced. Warranty and Service Repair Instructions 1. Pack the product safely making sure to include a copy of the sales receipt, your name, return address, and phone number. Mark the package: Attention Service Department. 2. Call QSC's Service Department--1-800-772-2834--and obtain a "Return Authorization" (R.A.) number.Ship the product prepaid to QSC Audio Products. We recommend UPS. 3. We will determine if the product is under warranty: a. If it is, we will repair and ship it back to you at no charge. b. If it is not, we will contact you and inform you of the charges. Upon your approval, we will repair the product and ship it back freight and services charges collect (COD). 1.3 OVERVIEW OF AMPLIFIER The basic Series One circuit design is the result of years of QSC product development, combined with a host of new features, a number of circuit improvements, and the use of premium components. The result is superb audio performance, exceptional reliability, and a flexible interface system. To begin with, each channel has a balanced bipolar power supply which assures proper dynamic response during program peaks. We then combine a superior series of complementary power transistors with a modern high-performance integrated circuit at the input, in order to deliver the required power with the minimum number of amplifying stages. This ensures minimum signal degradation with maximum reliability and consistency. The circuit accepts balanced or unbalanced input signals and provides the high internal gain needed for low overall distortion and wide frequency response. Due to the circuit simplicity and the fact that we can use direct-mounted output transistors, Series One power amplifiers offer higher power, smaller size and lower weight than older designs. In order to ensure that users get the full benefit of high performance amplification despite real-world hazards, our circuit includes many operational and protective features. Complete protection is provided for open-circuit, short-circuit, and mismatched loads; the amplifier will shut down temporarily if it over-heats, and AC circuit breakers protect against excessive power levels. Our protection circuits are designed to ensure a minimum of false triggering and unwanted interruptions and except for the AC breaker, which replaces the usual AC fuse, all protection systems will reset 3 automatically as soon as safe operation is assured. An equally important muting circuit protects the loudspeakers from unexpected damage, by muting the amp during turn-on and turn-off and by blocking DC faults, whether caused by the amplifier or preceding components. The front panel presents essential user information and is recessed to prevent damage. The green power indicator serves as a pilot light and individual red clip indicators monitor overall performance of each channel. The AC switch and circuit breaker are front mounted for convenience and quick resetting. Except for the Model 1100, the Gain controls and input programming switches have been placed on the back of the amplifier to protect them from damage, inadvertent adjustment, or tampering. The Gain controls, as well as a pair of headphone jacks, have been placed on the front panel of the Model 1100 to allow easy access in monitoring applications. The amplifiers use a separate bipolar power supply for each channel, for minimum crosstalk, cross-distortion, and greater reliability. A single dual-secondary transformer feeds isolated, separately fused rectifiers and filter capacitors for each channel. Thus the remaining channel can keep running in case of breakdown. In order to interface properly with a variety of pro-audio systems, we have included all of the popular input and speaker connectors. Balanced or unbalanced inputs can be made using XLR plugs, screw lugs to the barrier strip, or 1/4-inch phone plugs (ring-tip-sleeve for balanced inputs). Speaker connections are made with 5-way binding posts. The steel chassis, of the 1200, 1400 and 1700, is a 14 gauge, single piece design with integral rack mounting ears. The 1100 chassis features single piece aluminum extrusions that form the sides of the chassis and feature integral rack mounting ears and heatsinks. The extra strength chassis and rugged mounting of internal parts contributes greatly to QSC's reputation for reliability by protecting the circuitry from years of road abuse. All of these points are more fully explained in the following Sections. 1.4 SPECIFICATIONS 1100 OUTPUT POWER (per channel) Both Channels Driven 8 ohms, 20-20 kHz, 0.1% THD 4 ohms, 20-20 kHz, 0.1% THD Bridged-Mono Operation 8 ohms, 20-20 kHz, 0.1% THD DYNAMIC HEADROOM dB 8 ohms 4 ohms DISTORTION, THD @ 8 ohms 20-20 kHz, at rated power SMPTE-IM at rated power FREQUENCY RESPONSE DAMPING FACTOR @ 8 ohms NOISE (A-weighted) VOLTAGE GAIN, dB SENSITIVITY, V RMS (for rated power, 8-ohms) INPUT IMPEDANCE 1200 1400 1700 50w 70w 140w 100w 150w 300w 200w 300w 600w 325w 500w 1000w 2.0 2.3 2.0 2.5 2.0 2.5 1.9 2.9 Less than 0.1%, 0.01% typical Less than 0.025% 20-20 kHz, +0, -1.0 dB at 1 watt Greater than 200 100 dB below rated power 26 1.0 29 1.0 32 1.0 34 1.0 10K unbalanced inverting 20K balanced or unbalanced non inverting -70dB, 20-20 kHz AC Switch, Circuit Breaker, Gain Knobs, Input Programming DIP Switches, and Bridging Switch Power: Green LED Convection Clip: Red LED 2 speed fan 2 speed fan CROSSTALK CONTROLS INDICATORS COOLING 4 Convection AMPLIFIER PROTECTION Full Short Circuit, Open Circuit, Over-Temp, Ultrasonic and RF Protection. Stable into reactive or mismatched loads. DC Load Fault Protection 3 Second Turn-on, Instant-off Muting 4 8 16 32 SPEAKER PROTECTION COMPLEMENTARY OUTPUT DEVICES POWER SUPPLY Single Transformer with Independent Isolated Secondary Windings, Fault Fuses, Rectifiers, and Filter Capacitors DIMENSIONS Faceplate Width Faceplate Height Chassis Depth WEIGHT Shipping, Lbs Net, Lbs Standard 19" Rack Mounting 1.75" 5.25" 8.7" 9.5" 5.25" 9.5" 7.0" 11.75" 15 12 28 24 37 34 57 55 II: BASIC INSTRUCTIONS 2.1 UNPACKING AND INSPECTION All QSC Series One amplifiers are fully tested and inspected before they leave the factory. Despite the protective carton and rugged amplifier design, it is possible for shipping abuse to damage the amplifier. Check for obvious carton damage while unpacking the unit. After removing the amp from the box, rotate it in all directions to check for loose parts inside. Please save the carton for return shipment, if required. QSC does not warranty against damage caused by sending amplifiers back in the wrong carton. If shipping damage is ...