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Connect the provided irp-20 ac power pack – USL UPC-2 User Manual

Page 6

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UPC-1/UPC-2 Installation Manual

6

January, 1999

CONNECT THE AUDIO INPUT LINE

Connect the Center channel speaker terminals to the + and – (ground) audio input
terminals on the IRC-20 as in Fig. C. If the center channel is bi-amped, you must con-
struct 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-20 audio input. You also may connect the
IRC-20 to the output of a monitor or a processor.

WOOFER

HIGH

FREQUENCY

HORN

100k

50k

+

+

TO IRC-20
+TERMINAL

CONNECT THE PROVIDED IRP-20 AC POWER PACK

+ –

AC

PANEL

#1

PANEL

#2

AC

50
%

CLIP

INPUT
LEVEL

ADJUST

POWER

Processor Center Channel

OR

Center Channel Speaker

+ E

®

INFRARED HEADPHONE TRANSMISSION SYSTEM

MODEL IRC-20 EMITTER/MODULATOR SYSTEM

IRM-20 MODULATOR

ULTRA

STEREO LABS, INC.

Tarzana, California

®

AC Gnd AC

Connect ground wire to
IRM-20 Chassis (May be
required by local
building code).

AC Power Pack

Fig. C – Connecting the audio input and 24 V AC power pack to the
UPC-1 system

Fig. D
Summing resistor network for
use with bi-amped center
channel speakers

FOR THE UPC-1
(See Figure C)
Connect the provided
IRP-20 AC Power Pack
to the IRC-20 AC Panel
#1 terminals using
standard 18-gauge or
greater zip cord. (See
Table 1 for lengths.)
Make sure there 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 V AC 50/
60 Hz outlet.

TABLE 1

Maximum lengths
and gauge sizes for
connector cord from
IRP-20 AC Power
Pack to the IRC-20
AC Panel #1 termi-
nals.

60'

@

18 ga.

100'

@

16 ga.

150'

@

14 ga.

200'

@

12 ga.

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