Black Box HD View AC3000A-R2 Series Quick Start Manual page 11

2. Connect the audio/speakers to the Audio port.
NOTE: If you are connecting the audio out of the receivers to
speakers, they must have an internal amplifier. The audio
out is a line out extension of the player.
3. Where relevant, attach the Serial connection to the Serial
port.
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Chapter 2: Connecting CATx Cable
Page 11