12
Connections
Inputs
Each channel has active balanced XLR, ¼" (6.3 mm), and Barrier Strip inputs wired in parallel (Figure 24). The input impedance for balanced is
20k ohms, for unbalanced it is 10k ohms
Balanced connections are recommended to reduce AC hum and interference, especially with long cable runs. Unbalanced connections may be suit-
able for short cables. The signal's source impedance should be less than 600 ohms.
Balanced Inputs
Use the XLR or ¼" (6.3 mm) TRS input jacks, or the barrier strip. (Figure 24)
Unbalanced Inputs:
Connect the unused side (Pin 3) of the balanced input to ground (Pin 1), as shown in (Figure 25).
For STEREO operation, use the inputs for both Channel 1 and Channel 2. For PARALLEL INPUTS 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 amplifiers (PARALLEL INPUTS and BRIDGE MONO
modes only), see the instructions for using PARALLEL INPUTS on page 8 through page 11.
Any one of these
three connections
XLR unbalanced Jumper pin 1 to
pin 3
Pin 1 = Ground
Pin 2 = +
Pin 3 = —
— Figure 24 —
— Figure 25 —
Balanced
Unbalance
ground
inverting input
non‑inverting input
ground
non‑inverting input
— Figure 26 —
— Figure 27 —
