Kramer Electronics VP-2x2 - Manual (Page 9)

Connecting the VP-2x2 2x2 XGA/Audio Matrix Switcher
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5.2 Connecting the Balanced/Unbalanced Stereo Audio Input/Output
This section illustrates how to wire:
A balanced input/output connection, see Figure 3
An unbalanced audio input, see Figure 4
An unbalanced audio output, see Figure 5
Figure 3: Connecting the Balanced Stereo Audio Input/Output
Figure 4: Connecting the Unbalanced Stereo Audio Input
Figure 5: Connecting an Unbalanced Output