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3
stereo
s
igna
l s
inc
e b
ot
h
1
/
4
-inc
h S
tere
o L
in
e j
ack
s a
r
e c
onnected
in
p
arallel.
2. When
internal switch S105 is set for Mono, the FP22 accepts
individual
left and right
1
/
4
-inch mono connectors
to provide a
stereo
signal. Stereo Line jack (1) is the left input; Stereo Line
jack
(2)
is the right input. No loopthrough capability is available
with
S105 set for Mono.
TYPICA
L M
ONITORING CONNECTIONS
1. One Mono Input. A mono signal connected to an XLR or
phone jack will be monitored as a mono headphone signal.
(When using the Mono XLR connectors, the Line/Mic switch
should
be set to match the input.)
2. One Stereo Input. A stereo signal connected to the Stereo
Line
jacks can be monitored as a
stereo output on stereo head
-
phones
or as a mono output.
3. One
Stereo
Input Plus One Mono Input.
A mono signal input
through the Mono XLR connector and a stereo signal input
through
the Stereo Line jacks can be monitored as a mixed out
-
put,
with both signals appearing in the stereo headphones.
4. Three Mono Inputs - Stereo Headphone Signal Output.
Three mono signals can be accepted through the mono-XLR
jacks
and the stereo line jacks, and mixed and monitored as a
stereo
signal in the stereo headphones.
NOTE:
The FP22 can be modified so that all input jacks are in
parallel.
This duplicates the Shure FP12
in functionality
. This
modification
allows monitoring in mono only
. Please contact
Shure’s
Product Applications Group for details on this modifi
-
cation.
INTERCOM CAPABILITY
The FP22 can interface to commercially available intercom
systems,
such as R
TS, T
elex and ClearCom. The diagrams be
-
low
show how to interface
the FP22 to these systems and what
can
be monitored.
More information about intercom systems can
be
obtained from the intercom manufacturers.
Telex Intercom Systems
(Figure 1)
Telex uses a standard balanced audio line. No modification
is
required to interface the FP22 with T
elex intercoms.
1.
Use the Mono XLR Loopthrough connections.
2. Mon
o X
LR level switch shoul
d b
e se
t to t
h
e L
in
e p
osition.
3. 24
volts phantom power on the intercom line is passed
through
the
FP22.
1
2
3
AUDIO
(+)
AUDIO (–)
REF
+24 VDC
+24 VDC
FIGURE
1
RTS
and ClearCom Systems
(Figure 2)
These two systems use an unbalanced audio line which re-
quires
use of the
1
/
4
-inch line connectors of the FP22 for opera
-
tion. The Y–cable depicted in Figure 2 is required for RTS and
ClearCom intercom systems.
1. The
above Y–cable
is placed in-line into the intercom system.
2. Set
internal switch S105 to Stereo (factory setting).
Wiring
for R
TS and ClearCom Systems
Pin RTS ClearCom
2 Audio
channel 1, 24Vdc
Audio, 18-36 Vdc power
3
Audio channel 2, 24 Vdc
Audio, 12 Vdc call signal
1
Reference (ground)
Reference
(ground or com
-
mon)
1
2
3
1
2
3
FIGURE
2
TO STEREO LINE
LOOPTHROUGH
CONNECTION ON FP22
SLEEVE
RING
TIP
SPECIAL APPLICATIONS
Troubleshooting stage sound systems. The FP22 can be
used
to trace a signal line when one or more
microphones are not
working on stage. To locate the malfunction, loop the signal
through the FP22 wherever an XLR or phone connector is lo-
cated
and monitor the signal.
Field monitoring applications can be set up by inserting
FP22
units “in line” without af
fecting the signals.
On
stage monitoring.
With
the FP22, an ef
fective on–stage
in-ear
monitor system can be created. From a mixing console a
stereo
signal can be looped through
to multiple FP22’
s, while the
Mono XLR jack can be used for an individual’s microphone or
musical
instrument. Each performer has control of overall head
-
phone
volume as well as a mix control of their
individual voice or
instrument
with the stereo signal.
Boosting headphone output. The FP22 can be used to
boost the headphone output of existing devices. The stereo
headphone output of an audio device can be connected to the
Stereo Line connectors of the FP22. The FP22 will provide a
high–quality
headphone output with the ability to loop through
to
another
FP22.
Using the FP22 as a two-stage intercom system. A two-
stage
intercom system can be created by
connecting two FP22
units
with a single standard microphone cable. Each person con
-
nects
a Shure SM12A or other headset
microphone’
s XLR output
and
earphone input
connector to their individual FP22. Both mi
-
crophone
signals appear at each FP22 headphone output.
Practice headphone amplifier for microphones or other
sources, such as electric instruments, synthesizers, etc. Con-
nect the output from any instrument into the FP22 and monitor
the
headphones.