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11
12
Connections
Inputs
Each channel has active balanced XLR and ¼" (6.3 mm) inputs wired in parallel (Figure 22). The input impedance is 20 kΩ balanced,
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 (Figure 25).
Unbalanced Inputs:
Connect the unused side (Pin 3) of the balanced input to ground (Pin 1), as shown in (Figure 23).
A tip-sleeve ¼" (6.3 mm) connector will correctly terminate the unused side of the input ( Figure 26).
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 6.
Or
Balanced Unbalance
XLR unbalanced
Jumper pin 1 to pin 3
TRS unbalanced
No modification needed
– Figure 22 –
– Figure 23 –
Pin 1 = Ground
Pin 2 = +
Pin 3 = -
– Figure 24 –
– Figure 25 – – Figure 26 –
ground
inverting Input
non-inverting input
ground
non-inverting input