USL UPC-21 - Manual (Page 6)

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Connect the center channel speaker terminals to the + and - (ground) audio
input terminals on the IRC-21 as in Fig C. If the center channel is bi-amped,
you must construct a resistor network, as in Fig. D, that sums the high and
low frequency signals, then feed the output of the network to the IRC-21 audio
input. You also may connect the IRC-21 input to the output of a monitor or a
processor.
CONNECT THE AUDIO INPUT LINE
CONNECT THE IRP-20 DC POWER PACK
Connect the provided IRP-20
DC power supply to the IRC-
21 power input terminals (1
and 2). If the DC supply cable
needs to be extended, refer
to table 1 for suggested wire
sizes. Make sure there are
no loose wire strands at the
terminals to avoid potential
short circuits.
DO NOT SHORT THE
POWER SUPPLY!
Connect the power supply to
an AC outlet (100 - 240VAC,
50/60Hz) using the supplied
or a standard IEC power cord.