Model FP22 User Guide
Shure Brothers Incorporated
222 Hartrey Avenue
Evanston IL 60202-3696 U.S.A.
27A8362 (QE)
1997, Shure Brothers Inc.
Printed in U.S.A.
ÊÊ
ÊÊ
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)
Voltage Gain (at 1 kHz)
Input
Source
Impedance
Gain
(into 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
(pad at –30 dB)
600
Ω
–4
±
4 dB
–10
±
4 dB
Total 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
110 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%
