Polycom SoundStructure C16 Design Manual page 423

Advanced Applications
By default the two telephone lines are routed to both "Amplifier 1" and
"Amplifier 2" and the stereo program audio "Program Audio" channel is
routed as a mono signal to both Amplifier 1 and Amplifier 2 as shown in the
next figure.
To create the positional solution, route one telephony interface to one ampli-
fier and route the other to the second amplifier. Also, we'll make the
assumption that each amplifier should receive one channel of the stereo pro-
gram audio. The mapping of the stereo program audio signal to the mono
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