III. Inputs

 

CX amplifiers feature balanced inputs, connected via a Euro-style 7-terminal

Loosen screw,

 

detachable header. Attach input signal wires as shown. If you are connecting an

insert wire here,

unbalanced signal to an input, use the non-inverting (+) input and the ground

then tighten screw.

 

terminals of the header, and also connect a wire jumper between the inverting (-)

 

input and the ground terminal. The wire jumper will prevent a reduction in gain

Channel2+ Channel2- Ground Ground Ground -1Channel 1+Channel

caused by a floating input.

 

If you need XLR or 1/4” RTS inputs on your CX6, CX6T, CX12, CX12T, use the optional MX-1 input expander (available through QSC’s Technical Services Department).

Typical of QSC amplifiers, the input impedance of a CX Series amplifier is 20 kilohms balanced and 10 kilohms unbalanced.

Each CX Series (except CX4, CX4T) amplifier features a Level I Open Input Architecture slot. See the Operation Chapter for more information about Open Input Architecture.

Balanced input connections

INPUT SENSITIVITIES

Audio signals of these levels will produce full rated output power at 8 ohms.

 

CX4, CX4T

0.98 volt (+2.0 dBu)

 

 

 

 

 

CX6, CX6T

1.02 volt (+2.4 dBu)

 

 

 

 

 

CX12, CX12T

1.00 volt (+2.2 dBu)

 

 

 

 

IV. Outputs

Wire jumper between input and ground

Shield

Unbalanced input connections

Signal conductor

Covered barrier strips located on the rear panel allow speaker cable connections to the amplifier outputs. See the diagrams for details on connecting speakers and/or distributed (25-, 70-, or 100- volt) lines. For attaching wires, we recommend using insulated connectors of the type shown. Always make sure the amplifier is turned off before you change any output connections or lift the safety shroud.

If you are operating the amplifier in bridged mono mode to achieve higher output voltages, neither speaker wire is grounded. Therefore, use the same precautions in handling and dressing the wire that you would for the normal “hot” outputs. See the section on bridged mono operation for additional important instructions.

If you are driving a distributed line, make sure the sum of all the power demands of the speakers does not exceed the amplifier’s power rating. In fact, it is good practice to allow about a 25% safety margin. For example, if the load on the distributed line is 400 watts, use an amplifier with a power

rating of 500 watts. See the Application Notes in the back of this manual for more details on distributed lines.

Lift safety shroud.

Loosen screw terminals.

Insert wire connectors under screws.

Tighten screw terminals.

Lower safety shroud.

6

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QSC Audio CX Series user manual III. Inputs, IV. Outputs, Input Sensitivities, Caused by a floating input
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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.
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