Shure Stereo Amplifier FP22 User Manual

Shure Brothers Incorporated  
222 Hartrey Avenue  
Evanston IL 60202-3696 U.S.A.  
Model FP22 User Guide  
Overall headphone balance control  
Overall stereo/mono switch for headphones  
LED power indicator  
Powered by easily obtainable 9–volt alkaline battery or by external 12  
to 24 Vdc power supply (such as Shure Model PS20 or PS20E)  
1
/
4
-inch and 3.5 mm stereo headphone jacks  
Effectively shielded for low susceptibility to radio-frequency interfer-  
ence (RFI)  
SPECIFICATIONS  
Frequency Response (ref 1 kHz)  
20 Hz to 20 kHz, +1, –3 dB (stereo line input)  
50 Hz to 18 kHz, +1,–3 dB (mono XLR input)  
Equivalent Input Noise  
–125 dBV (maximum gain; source resistance 150 ; 20 Hz to  
20 kHz)  
Voltage Gain (at 1 kHz)  
GENERAL  
The FP22 is a battery-powered stereo headphone amplifier that  
Source  
Impedance  
Gain  
(into 63 )  
Gain  
(into 8 )  
Input  
provides headphone feeds from any audio input source. It has the  
unique capability of monitoring mono, stereo and mixed mono and  
stereo inputs. The FP22 monitors and combines these signals in  
XLR  
(mic level)  
150  
600  
600  
600  
80 ± 5 dB  
29 ± 5 dB  
26 ± 4 dB  
–4 ± 4 dB  
74 ± 5 dB  
23 ± 5 dB  
21 ± 4 dB  
–10 ± 4 dB  
the headphones without affecting the original signal. Stereo or  
1
XLR  
(line level)  
mono headphone outputs appear on  
/
4
-inch phone or mini 3.5 mm  
stereo jacks. The FP22 can drive headphones to very loud levels.  
It is ideal for anyone in the broadcasting, sound reinforcement or  
audio recording fields who needs a flexible, high–quality head-  
Stereo line  
(pad at 0 dB)  
phone monitor  
.
Stereo line  
The FP22 is excellent for:  
Line checking applications  
(pad at –30 dB)  
T
otal Harmonic Distortion  
Less than 0.5% measured at –8 dBV into 8 (20 Hz to 20 kHz  
stereo line input; 50 to 18 kHz mono XLR input)  
Providing multiple headphone feeds  
On stage in-ear monitoring  
Boosting headphone circuits  
Headphone foldback in recording studios  
Input Clipping Levels (at 1 kHz)  
Mic level  
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . 160 mV (–16 dBV)  
Line level  
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 V (+34 dBV)  
Practicing musical instruments or mixed vocals through headphones  
while monitoring a stereo source  
Output Level at Clipping  
Features:  
Headphones FP22 Out- Headphones  
Head-  
Impedance  
put  
Sensitivity phones SPL  
Exceptionally wide frequency response and dynamic range  
63  
1.2 V (1.6  
dBV)  
106 dB at 1  
mW  
120 dB  
High-impedance bridging inputs do not load signal sources  
Capable of mixing mono and stereo inputs in headphone outputs  
Complete user control of headphone volume  
8
500 mV (–6  
dBV)  
95 dB at 1  
mW  
110 dB  
1
Loopthrough / -inch stereo phone jacks (can be internally switched to  
4
Input Impedance  
XLR (mic level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3 k±10%  
XLR (line level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 k±10%  
Stereo Line (pad at 0) . . . . . . . . . . . . . . . . . . . . . . 50 k±10%  
Stereo Line (pad at 30 dB) . . . . . . . . . . . . . . . . . . 53 k±10%  
become separate left and right inputs)  
30 dB pad for stereo line input to accommodate a wide range of line level  
sources  
.
.
Balanced loopthrough XLR connectors switchable from mic to line  
level  
.
Headphone Output Impedance (at 1 kHz)  
Separate XLR volume control on pull-out control knob  
10.2 ± 10%  
E1997, Shure Brothers Inc.  
27A8362 (QE)  
Printed in U.S.A.  
 
1
stereo  
in arallel.  
2. When internal switch S105 is set for Mono, the FP22 accepts  
s
ignal since bot  
h
/ -inch Stereo Line jacks a  
r
e connected  
1. The above Y–cable is placed in-line into the intercom system.  
2. Set internal switch S105 to Stereo (factory setting).  
Wiring for RTS and ClearCom Systems  
4
p
1
individual left and right  
/
4
-inch mono connectors to provide a  
Pin  
2
RTS  
ClearCom  
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.  
Audio channel 1, 24Vdc  
Audio channel 2, 24 Vdc  
Reference (ground)  
Audio, 18-36 Vdc power  
Audio, 12 Vdc call signal  
3
TYPICAL MONITORING CONNECTIONS  
1
Reference (ground or com  
mon)  
-
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  
-
1
2
2
1
phones or as a mono output.  
3
3
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.  
-
TO STEREO LINE  
LOOPTHROUGH  
CONNECTION ON FP22  
TIP  
RING  
SLEEVE  
FIGURE  
2
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.  
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.  
Field monitoring applications can be set up by inserting  
FP22 units “in line” without affecting the signals.  
INTERCOM CAPABILITY  
The FP22 can interface to commercially available intercom  
systems, such as RTS, Telex and ClearCom. The diagrams be  
-
On stage monitoring. With the FP22, an effective 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  
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.  
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.  
-
Telex Intercom Systems (Figure 1)  
Telex uses a standard balanced audio line. No modification  
is required to interface the FP22 with Telex intercoms.  
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.  
1. Use the Mono XLR Loopthrough connections.  
2. Mono XLR level switch should be set to the Line position.  
3. 24 volts phantom power on the intercom line is passed through  
the FP22.  
Using the FP22 as a two-stage intercom system. A two-  
stage intercom system can be created by connecting two FP22  
1
2
AUDIO (+)  
AUDIO (–)  
+24 VDC  
+24 VDC  
3
units with a single standard microphone cable. Each person con  
-
nects a Shure SM12A or other headset microphone’s XLR output  
REF  
and earphone input connector to their individual FP22. Both mi  
-
crophone signals appear at each FP22 headphone output.  
FIGURE  
1
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.  
RTS and ClearCom Systems (Figure 2)  
These two systems use an unbalanced audio line which re-  
1
quires use of the  
/
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.  
3
 
Mono XLR Connectors  
(Balanced) Loopthrough connec-  
tors accept both mic and line level  
signals. Volume adjusts with pull  
out triple–function Volume control  
(center detent is nominal volume).  
Stereo Line Jacks  
(Unbalanced) Dual function jacks.  
Factory supplied so that tip, ring,  
sleeve stereo signal applied to  
one jack can be looped through to  
other jack (tip-left, ring-right,  
sleeve-ground). Jacks can be in-  
ternally switched so that two  
mono phone jacks can be input  
and monitored in stereo without  
LOOP THRU  
1
2
loopthrough  
(see  
Internal  
switches).  
STEREO LINE  
Balance Control  
LED Power Indicator  
Lights when FP22 is turned on.  
(Outer ring of triple function Volume  
control.) Overall headphone balance  
control with center detent.  
POWER  
POWER/VOL  
BAL  
PULL FOR  
MONO XLR VOL  
Stereo/Mono Headphone Mode  
Switch  
Changes headphones from stereo  
to mono. Especially useful when  
monitoring monaural signal con-  
STEREO  
Triple Function Volume Control  
Incorporates On/Off switch, overall  
Volume control (master volume), and  
Mono XLR Volume (on the pullout).  
Center–detented Mono XLR volume  
MODE  
MONO  
nected to stereo line jacks.  
0 dB  
30dB  
STEREO  
LINE  
PAD  
at nominal level.  
Stereo Line Pad  
3.5 mm Stereo (3-Circuit) Mini  
Headphone Connectors  
Reduces gain on Stereo Line sig-  
nals by 30 dB. Especially useful  
with signal levels of +4 dBm or  
greater.  
Mono or stereo program monitor  
.
A
B
Mono XLR Mic/Line Switch  
Selects between microphone and  
line level signals coming into XLR  
connector (50 dB pad inserted be  
fore mic preamp when switch is in  
Line position).  
1
/ -Inch Stereo (3-Circuit) Head-  
4
phone Connectors  
Mono or stereo program monitor; us  
ing these jacks disables 3.5mm jacks.  
-
-
HEADPHONES  
12–24 Vdc  
IN  
+
Battery Compartment  
Requires one 9 V alkaline battery  
External Power Jack  
.
Accepts external supply voltage  
from 12 to 24 Vdc (such as Shure  
PS20 or PS20E Power Supplies).  
Tip is positive, sleeve is negative.  
4
 
REPLACEMENT  
DESCRIPTION  
PARTS LIST  
REFERENCE  
DESIGNATION  
SHURE  
COMMERCIAL ALTERNATE*  
PART NO. AND/OR  
BT1  
Battery, Alkaline, 9 V  
Dual Diode Assembly  
Diode  
Diode, Schottky  
Light–Emitting Diode, Red  
Connector, 3–Socket, MONO XLR  
Connector, 3–Pin, MONO XLR  
Phone Jack, Stereo, STEREO LINE LOOPTHRU  
Phone Jack, Stereo Switching, HEADPHONES  
Phone Jack, Stereo, HEADPHONES  
Connector, Power, 12–24 VDC IN  
Ferrite Bead Ring  
Duracell MN1604  
Shure 22202FT; NEC 1SS123  
D101–D107, D113, D115  
D108–D110  
D111–D112  
D114  
J101  
J102  
J103–J104  
J105, J107  
J106, J1 08  
J109  
L101–L104  
L105–L109  
MP1  
Shure 22203FT; Toshiba 1SS193  
Shure 22204FT; Toshiba U1GWJ44  
Shure 22205FT; Toshiba TLR124  
Shure 95A8381; ITT Cannon XLM–3–31PCV  
Shure 95A8400; ITT Cannon XLM–3–32PCV  
Shure 22201FT; Hosiden HLJ0546–01–010  
Shure 20202FT; Hosiden HLJ3305–01–3080  
Shure 20203FT; Hosiden HSJ0926–01–1010  
Shure 30252FT; Hosiden HEC0470–01–630  
Shure 80A250; TDK BF30–3.4x6x1  
Shure 22801FT; TDK ZBF503S–01  
Shure 10209FT  
Filter  
Battery Door Assembly (with hinge, lockscrew)  
Belt Clip (without screws)  
Knob, Inner (small)  
MP2  
MP3  
Shure 53A1891  
Shure 95A8539  
MP4  
Knob, Outer (larger ring)  
Transistor, NPN  
Transistor, PNP  
Transistor, PNP  
Transistor, NPN  
Shure 95B8539  
101, Q103  
Q102, Q104  
Q105  
Q106  
Q107–Q111  
Shure 22603FT; Sanyo 2SD438FMP  
Shure 22604FT; Sanyo 2SB560FMP  
Shure 22605FT; Toshiba 2SA1015GR  
Shure 22606FT; Toshiba 2SC1851GR  
Shure 22606FT; Siliconix SST177  
Field Effect Transistor  
R106/R127/R144/R157/R158 Potentiometer, Ganged, 100k/250k/250k/200k/200k, Shure 22206FT  
20%, VOLUME  
S101–S102, S106  
Switch, Slide, DPDT, MONO XLR LEVEL, STEREO Shure 55A8020; Nikkai AS–22AH  
LINE PAD, MONO/STEREO  
S103  
S104  
S105  
T1  
U101  
U102  
U103  
Part of R106/R127/R144/R157/R158  
Switch, DIP, DPST  
Switch, Slide, DPDT  
Transformer, Input  
Integrated Circuit, Dual Op Amp  
Integrated Circuit, Quad Op Amp  
Integrated Circuit, Voltage Regulator  
Shure 22401FT; Fujisoku DSS2–02  
Shure 22402FT; Nikkai SS–22SB112  
Shure 22501FT  
Shure 86A8953; Motorola MC33178P  
Shure 22601FT; Motorola MC33179P  
Shure 22602FT; Motorola MC7809CT  
*Commercial alternates are acceptable equivalents; for optimum performance, only direct replacement parts should be used.  
5
 

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