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UPC-21
I
NSTRUCTION
M
ANUAL
Ultra Stereo Labs, Inc.
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 AC POWER PACK
Connect the provided IRP-
20 AC Power Pack to the
IRC-21 AC terminal using
standard 18-gauge or
greater “zip” cord. (see
TABLE 1 for lengths). Make
sure ther are no loose wire
strands that could touch any
nearby metal and short the
power pack.
DO NOT SHORT THE
POWER SUPPLY!
Connect the power pack to
a 115 VAC 50/60 Hz outlet.
100k
50k
To IRC-21
+terminal
FIGURE
D
FIGURE C
Cinema Processor Center Channel
AC Power Pack
+ E
Fed From
Center Channel Speaker
OR
