QSC Audio 1200, 1100, 1400 Introduction, Welcome, Warranty and Disclaimers, Overview of Amplifier

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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).

1.3OVERVIEW 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

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Contents Owner’s Manual Avis SafeguardsPrecautions B L E O F C O N T E N T SOverview of Amplifier Warranty and DisclaimersIntroduction WelcomeFrequency Response SpecificationsInput Impedance Crosstalk Controls Indicators Cooling 1100 1200 1400 1700Important Precautions II Basic InstructionsUnpacking and Inspection Quick Instructions Back View Front ViewCooling III OperationAC Requirements Input ConnectionsSee illustrations in .3 for location 34a 1/4-inch RTS Balanced Output Connection 36 1/4-inch Quasi-balanced Output Connection Input Switches and Mono Bridging Octal Module AccessoriesSpeaker Connections Mono Bridge PrecautionsCable Power Loss Damping Length Gauge Resistance 69 Speaker Wire TableFactor Output Protection Features73 70 Volt Output Power 25 and 70 Volt SystemsNo Sound Operational TroubleshootingUnwanted Noises Horn Driver Protection IV Speaker ProtectionBackground DC ProtectionUser Responsibility Power CapacityPower Limiting RMS Power Ohm 16-ohm LoadObtaining Service Maintenance and ServiceCleaning User MaintenancePage D I O

1200, 1700, 1400, 1100 specifications

QSC Audio has long been a revered name in professional audio, and its series of amplifiers—including the QSC 1100, 1200, 1400, and 1700—continues to showcase the brand's commitment to quality, performance, and innovation. Each model is designed to meet the diverse needs of audio professionals, whether for live sound, installations, or studio use.

The QSC 1100 amplifier is renowned for its lightweight and compact design while delivering a solid 1100 watts of power. It features QSC's advanced Class D technology, which not only provides high efficiency but also significantly reduces heat generation. The 1100 includes comprehensive protection circuitry, ensuring safe operation in all situations. With a Frequency Response of 20 Hz to 20 kHz, the amplifier offers a balanced and clear sound profile, making it suitable for various applications.

Moving up the line, the QSC 1200 offers increased power output at 1200 watts and comes equipped with advanced DSP (Digital Signal Processing). The DSP allows users to tailor the audio output precisely, delivering optimized performance for any setting. In addition to its robust power, the 1200 features a versatile input section, supporting both XLR and 1/4" TRS connectors, providing flexibility for any audio source.

The QSC 1400 amplifier is a workhorse in the series, capable of producing up to 1400 watts, making it ideal for larger venues and events. This model is designed with enhanced thermal management, ensuring reliability even during extended use. The 1400’s high-frequency response capabilities further improve its adaptability, handling complex audio signals with ease.

Lastly, the QSC 1700 stands as the powerhouse of this lineup, delivering a remarkable 1700 watts of clean, distortion-free audio. It boasts an advanced cooling system, making it perfect for high-demand environments. The 1700 is also equipped with customizable limiter settings, allowing users to protect their speakers while maintaining sound integrity.

QSC’s commitment to durability is evident in all four amplifiers, featuring rugged chassis designs and high-quality components to withstand the rigors of professional use. Collectively, the QSC 1100, 1200, 1400, and 1700 amplifiers offer a compelling range of features that cater to various audio needs, all while ensuring superior sound quality and reliability, making them excellent choices for any sound engineer or venue manager.
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