QSC Audio Understanding Maximum Power and Current Consumption in QSC Stereo Amplifiers
Page 14

MAXIMUM LONG-TERM OUTPUT POWER

In a properly designed sound system, you can obtain the desired sound level without using the full output power of the amplifier; if the “CLIP” indicators flash once in a while, that is perfectly normal.

If the amplifier is operated at extremely high power levels, it may overheat or may even damage the speakers. The amount of stress on the amplifier depends largely on the load and how hard the amplifier drives it. In general, the lower the load impedance, the more stressful the load is.

8-Ohm Loads and Lightly Loaded 25V, 70V, or 100V Lines

The amplifier can operate at practically any power level without risk of overheating. However, if it is pushed hard enough to continually light the “CLIP” indicator, the amplifier’s average output power can reach 110 to 475 watts (depending on the model), which is more than many speakers can handle.

4-Ohm Loads and Heavily Loaded 25V, 70V, or 100V Lines

If the “CLIP” indicator flashes occasionally, the amplifier is approaching its maximum long-term power capacity. If it is lit about half the time, the amplifier channel will probably go into thermal protection within a few minutes.

2-Ohm Loads

Except for an occasional flash, keep the “CLIP” indicator dark to avoid overheating the amplifier channel.

AC CURRENT CONSUMPTION

A major objective in the design of the CX Series amplifiers-even the higher-powered models-is to permit their operation from readily available, standard AC power sources.

“Normal conditions” in power amplifier rating means operating with a random program source (pink noise), using pink noise as a source, at an average power level equal to one-eighth of maximum power. This is recognized by most of the world’s safety agencies as the loudest you can play music through an amplifier and still keep the incidence of clipping to a reasonable minimum. An amplifier’s peak current draw at full output power into 2 ohms is several times what the “normal” draw is, but its various protection circuits will prevent this condition from lasting more than a minute or two.

When you plan the AC power hookups for your amplifiers, use the table in the Specifications section to predict the current requirements per amplifier. You can use the one-eighth power figures to predict the normal continuous current draw, then add a safety margin to allow for occasional crescendos.

13

Page 13 Page 15
Image 14
Page 13 Page 15
Contents CX Series Table of Contents Explanation of Graphical Symbols Speaker Damage Rack Mounting PrecautionsLifting Precautions Speaker Output Shock HazardII. Overall Description Portable rackCX4 Input Sensitivities III. InputsIV. Outputs Caused by a floating inputOutput connections for CX, bridged mono mode VI. Operation AC PowerControls & Displays CX4 and CX4TTroubleshooting CX6, CX6T, CX12 and CX12TProblem Overheating CX6, CX6T, CX12 & CX12TPage BRIDGED-MONO Mode Caution CX4 and CX4TMaximum LONG-TERM Output Power AC Current ConsumptionHeat Emissions Protection Circuits Damping Factor VII. SpecificationsFrequency Response Output RegulationInput SENSITIVITY, Vrms Power RequirementsVoltage Gain Input ImpedanceDimensions WeightLine for different power levels VIII. Distributed linesLoudspeaker Coverage and Placement IX. Designing the Distributed Sound SystemPage Requires Determining Power LevelsIntelligibility Selecting the Amplifier ExampleUsing Components with Different Voltages 25 x 1.25 = How Many Speakers?Watts for the speakers Or 64 speakers tapped at 5 watts, etcXI. Other Design Considerations Speaker Transformer SaturationWire Loss Power Transfer Coefficient = RLOAD/RWIRE + RLOAD2Page Heat Emissions XII. Address & Telephone Information

CX Series specifications

QSC Audio, a recognized leader in professional audio solutions, presents the CX Series of amplifiers, a fusion of power, efficiency, and cutting-edge technology designed to meet the demands of various sound reinforcement applications. Known for their reliability and outstanding performance, the CX Series amplifiers are perfect for installations in venues, theaters, and houses of worship, delivering high-quality audio reproduction regardless of the setting.

At the core of the CX Series is its robust Class D amplification. This technology not only ensures excellent audio fidelity but also enhances energy efficiency, resulting in lower operational costs and cooler running temperatures. The amplifiers utilize a linear power supply, which contributes to exceptional audio quality by providing stable and clean power to the components. With varying power ratings, including options ranging from 200 to 1200 watts per channel, the CX Series caters to different venue sizes and specific audio requirements.

The CX Series is engineered with a range of features that enhance usability and performance. Integrated DSP (Digital Signal Processing) allows users to access advanced sound processing algorithms, enabling fine-tuning of audio settings for optimal performance. The amplifiers include comprehensive protection circuitry to safeguard the equipment from thermal overload, short circuits, and signal clipping, ensuring longevity and reliability in demanding environments.

Connectivity is also a significant aspect of the CX Series. The amplifiers are equipped with a variety of input and output options, including XLR, 1/4" TRS, and barrier strip connectors, facilitating seamless integration with a wide range of audio sources and speakers. Moreover, the user-friendly interface includes LCD displays for easy monitoring, making setup and adjustments straightforward for audio engineers and technicians.

Another defining feature of the CX Series is its lightweight design. This portability makes installation and transport easy without compromising on performance. Additionally, QSC’s commitment to sustainability is evident in the design, as the amplifiers are constructed with environmentally friendly materials and have a reduced carbon footprint, aligning with modern practices in eco-conscious audio engineering.

In summary, the QSC Audio CX Series amplifiers blend professionalism with versatility, delivering exceptional performance that satisfies both audio quality and operational reliability. Their innovative technologies and thoughtful design make them a powerful ally for professionals in any sound reinforcement scenario.
Top Page Image Contents