QSC 1100 Owner's Manual
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QSC 1100 Owner's Manual

Series one
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Series One
Model 1100
Model 1200
Model 1400
Model 1700
®
*TD-000027-00*
A
U
D
I
O
Rev. C
1

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Summary of Contents for QSC 1100

  • Page 1 Series One Model 1100 Model 1200 Model 1400 Model 1700 ® *TD-000027-00* Rev. C...

  • Page 2: Table Of Contents

    Series One Power Amplifier Operation Manual T A B L E O F C O N T E N T S INTRODUCTION 1.1 Welcome ... 3 1.2 Warranty ... 3 1.3 Overview of Amplifier ... 3 1.4 Specifications ... 4 II: BASIC INSTRUCTIONS 2.1 Unpacking and Inspection ...

  • Page 3: 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.

  • Page 4: Specifications

    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.

  • Page 5: Ii: Basic Instructions

    AMPLIFIER PROTECTION SPEAKER PROTECTION COMPLEMENTARY OUTPUT DEVICES POWER SUPPLY DIMENSIONS Faceplate Width Faceplate Height Chassis Depth WEIGHT Shipping, Lbs Net, Lbs 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.

  • Page 6: Quick Instructions

    Be sure to observe correct polarity (red/black terminals) for each speaker to insure that all speakers move in the same direction. The 1100 features a pair of standard 1/4" headphone jacks on the front panel. They are connected to the speaker outputs of the amplifier through a resistive pad that prevents excessive power levels from damaging the headphones.
  • Page 7 The muting circuit blocks the sound for three seconds after turn-on and immediately after turn-off. This prevents turn-on and turn-off thumps and transients from reaching the speakers. Please refer to Section 3 for more detailed instructions. 1100 FRONT VIEW AC SWITCH AC BREAKER...

  • Page 8: Iii: Operation

    3.1 COOLING 3.11 The Model 1100 uses side-mounted, convection-cooled heat sinks for power transistor cooling. When rack mounted, temperature rise should not be excessive for eight-ohm loads at normal listening levels, but operation into lower impedances at high powers may cause heat build-up unless good access to cool air is provided at the sides of the rack.

  • Page 9: Ac Requirements

    3.12 The Model 1200 uses an internal heat radiator, top ventilation slots, and the faceplate for cooling. The faceplate will get quite warm in severe usage, but this heatsink system will serve adequately when the amp is used in the open air.
  • Page 10 mismatches will result in slight loss of common-mode rejection, but will still have much greater noise rejection than unbalanced inputs. 3.34 Balanced Inputs For proper balanced-line operation, the cable shield should be connected at the power amplifier end only and kept separate from both signal conductors. The cable shield should be connected to the barrel of a 1/4-inch plug, to pin 1 of an XLR plug, or to the “GND”...
  • Page 11 3.36 Unbalanced Inputs and Polarity Unbalanced operation raises an interesting question regarding the trade-offs between maintaining standard system polarity and optimal stability. Normally, an amplifier is expected to reproduce input signals in the same polarity, which is called the non-inverting mode, so that a drum beat, for instance, pushes the speaker out instead of in.

  • Page 12: Octal Module Accessories

    This is a way to fully use both channels when only a single speaker is driven. To engage the bridged-mono mode of the Model 1100, a slide switch must be set through a hole in the bottom of the amplifier.

  • Page 13: Speaker Connections

    Series One amplifiers. The 1100 features a pair of standard 1/4" headphone jacks on the front panel. They are connected to the speaker outputs of the amplifier through a resistive pad that prevents excessive power levels from damaging the headphones.
  • Page 14 loss of 10% is barely audible, the resultant low damping factor will prevent the amplifier from fully controlling the peaks and dips in frequency response caused by speaker impedance variations. This will result in greater coloration and muddiness. Cable Wire Cable Length Gauge...

  • Page 15: And 70 Volt Systems

    70-volt lines. The Model 1100 amplifier will deliver up to 120 watts directly to 25 volt lines by using the mono-bridge mode. Please note that, as with any system using the mono-bridge mode, neither side of the speaker line should be grounded.

  • Page 16: Operational Troubleshooting

    Protective muting for the Model 1100 is handled by a small relay at the input. The signal does not pass through the relay contacts, but is shunted to ground during the muting interval. Thus any degradation of the relay contacts will only affect the muting, and not the audio quality.
  • Page 17 then the fault is somewhere in the bad channel. Check the input program switches, octal accessory (if any) or jacks. See Section 3.5 for correct switch settings. Inspect the binding posts for damage, and try a different input jack or the parallel channel switches before giving up on the channel. 3.93 Weak But Clear Sound This usually indicates lack of input signal or incorrect Gain adjustment at some point.

  • Page 18: Iv: Speaker Protection

    4.2 DC PROTECTION The design of the 1100, 1200 and 1400 amplifier circuit eliminates the DC fault problem at its source, so no special protection is required. The QSC grounded collector output circuit is AC coupled and cannot pass DC to the load.

  • Page 19: Power Capacity

    You may have some problems finding the larger value capacitors in the preferred film-type construction. If necessary, several can be paralleled; simply add the individual capacitances together to get the total rating. You will probably have to locate non-polar electrolytics for values greater than 10-20uf. POWER CAPACITY All speakers have a maximum long-term power limit which is determined by the temperature rise of the voice coil.

  • Page 20: V: Maintenance And Service

    V: MAINTENANCE AND SERVICE 5.1 CLEANING The faceplate and chassis can be cleaned with a soft cloth and mild non-abrasive cleaning solution, such as Windex. Avoid cleaning powders or scrubbing pads, as these will scratch and dull the paint. Be sure to unplug the unit prior to cleaning. Do not apply liquid directly to the surface.
  • Page 22 ® “QSC” is a registered trademark of QSC Audio Products, Inc. 1675 MacArthur Blvd. Costa Mesa, CA 92626 (714) 754-6175 FAX (714) 754-6174...

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