QSC CX4T User Manual download pdf (Page 7)

Channel 2+

Channel 2-

Ground

Channel 1-

Channel 1+

Loosen screw,

insert wire here,

then tighten screw.

III. Inputs

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

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

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

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

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.

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

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.

Balanced input

connections

Shield

Signal conductor

Wire jumper

between

input and

ground

Unbalanced input

connections

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QSC CX4T User Manual Page 7

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