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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).
1.3 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