QSC Audio Specifications, 1100 1200 1400 1700, Frequency Response, Sensitivity, V Rms

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 1200 1400 1700

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

8ohms

4ohms

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

CROSSTALK

CONTROLS

INDICATORS

COOLING 4

50w	100w	200w	325w
70w	150w	300w	500w
140w	300w	600w	1000w
2.0	2.0	2.0	1.9
2.3	2.5	2.5	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	29	32	34
1.0	1.0	1.0	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		Clip: Red LED
Convection	Convection		2 speed fan	2 speed fan