Bogen Nyquist C4000 Series - Figure 2-3, Available Channels for an MMPA; Figure 2-4, Line Input for NQ-A4300 Audio Power Amplifier

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The available Input Channel selections can range from 1 or 2 for an
amplifier or 1 to 4 for an MMPA.
Figure 2-3, Available Channels for an MMPA
Figure 2-4, Line Input for NQ-A4300 Audio Power Amplifier