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Model FP22 User Guide
Shure
Brothers Incorporated
222 Hartrey A
venue
Evanston IL 60202-3696 U.S.A.
27A8362
(QE)
E
1997, Shure Brothers Inc.
Printed in U.S.A.
GENERAL
The
FP22 is a
battery-powered stereo headphone amplifier that
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
the headphones without affecting the original signal. Stereo or
mono
headphone outputs appear on
1
/
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-
phone
monitor
.
The FP22 is excellent for:
• Line
checking applications
•
Providing multiple headphone feeds
•
On stage in-ear monitoring
•
Boosting headphone circuits
•
Headphone foldback in recording studios
• Practicing musical instruments or mixed vocals through headphones
while
monitoring a stereo source
Features:
•
Exceptionally wide frequency response and dynamic range
•
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
• Loopthrough
1
/
4
-inch stereo phone jacks (can be internally switched
to
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
•
Separate XLR volume control on pull-out control knob
•
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 Ω; 20 Hz to
20 kHz)
V
oltage Gain
(at 1 kHz)
Input
Source
Impedance
Gain
(int
o 63
Ω)
Gain
(into 8
Ω)
XLR
(mic level)
150
Ω
80
± 5
dB
74
± 5
dB
XLR
(line level)
600
Ω
29
± 5
dB
23
± 5
dB
Stereo line
(pad at 0 dB)
600
Ω
26
± 4
dB
21
± 4
dB
Stereo line
(pa
d at –
3
0 d
B)
600
Ω
–4
± 4
dB
–10
± 4
dB
T
otal Harmonic Distortion
Less
than 0.5% measured at –8 dBV into 8
Ω
(20
Hz to 20
kHz
stereo
line input; 50 to 18 kHz mono XLR input)
Input Clipping Levels
(at 1 kHz)
Mic level
160 mV (–16 dBV)
.
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Line
level
50 V (+34 dBV)
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output
Level at Clipping
Headphones
Impedance
FP22 Out-
put
Headphones
Sensitivity
Head-
phones SPL
63
Ω
1.2 V (1.6
dBV)
106 dB at 1
mW
120 dB
8
Ω
500 mV (–6
dBV)
95 dB at 1
mW
1
10 dB
Input Impedance
XLR (mic level)
6.3 k
Ω
±10%.
. . . . . . . . . . . . . . . . . . . . . . . . . . .
XLR
(line level)
66 k
Ω
±10%.
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stereo
Line (pad at 0)
50 k
Ω
±10%.
. . . . . . . . . . . . . . . . . . . . . .
Stereo
Line (pad at 30 dB)
53 k
Ω
±10%.
. . . . . . . . . . . . . . . . . .
Headphone
Output Impedance
(at 1 kHz)
10.2
Ω
±
10%