QSC CMX 300V User Manual page 13

Connections
Inputs
Each channel has active balanced XLR and ¼" (6.3 mm) inputs wired in parallel
10 kΩ unbalanced.
Balanced signals are less prone to AC hum, but unbalanced signals can be suitable for short cable runs. The signal source's output impedance should
be less than 600Ω to avoid high frequency loss in long cables.
Balanced Inputs
Use the XLR or ¼" (6.3 mm) TRS input jacks, or the barrier strip
Unbalanced Inputs:
Connect the unused side (Pin 3) of the balanced input to ground (Pin 1), as shown in
A tip-sleeve ¼" (6.3 mm) connector will correctly terminate the unused side of the input
For Stereo operation, use the inputs for both Channel 1 and Channel 2. For Parallel or Bridge Mono operation, use the Channel 1 input.
See the section on operating modes for more information. To patch the audio signal to other amps (Parallel and Bridge Mono modes only), see the
instructions for using Parallel Inputs on page 7.
Balanced
ground
inverting Input
non-inverting input
(Figure
Or
– Figure 22 –
– Figure 25 –
(Figure 22). The input impedance is 20 kΩ balanced,
25).
(Figure 23).
( Figure 26).
XLR unbalanced
Jumper pin 1 to pin 3
TRS unbalanced
No modifi cation needed
Unbalance
ground
– Figure 26 –
13
Pin 1 = Ground
Pin 2 = +
Pin 3 = -
– Figure 23 –
– Figure 24 –
non-inverting input
ENG