Model FP23 User Guide Microphone Preamplifier
General Description
The Shure FP23 is a portable,
With its rugged mechanical and electrical construction, compact size, and
Features
Audio performance
•Maximum of 66 dB of gain, adjustable in eleven discrete steps for accurate, repeatable gain settings.
•Dynamic range exceeding 120 dB.
•20 Hz to 50 kHz audio bandwidth.
•High immunity to RF interference due to transformers, RF filtering, and
•High current line output driver capable of driving very long cable runs.
Transformer balanced
•
•
Limiter
•Extended range peak limiter uses dual
Battery power
•Internal battery power (two AA) for convenient, low cost power.
•Battery life greater than 24 hours.
Durable mechanical construction
•High strength extruded aluminum chassis with protective metal end rails to withstand punishing field conditions.
•Easy access battery compartment for quick battery changes.
Phantom power
•Selectable
High pass filter
•Two corner frequency settings.
2000, Shure Incorporated 27A8726 (TI)
Specifications
Gain
0 dB to 66 dB input to output, switch selectable
Gain Accuracy
+0.6, ±0.1 dB with reference to front panel gain markings (150 Ω source, 100k Ω load impedances)
Frequency Response (see graph below)
20 Hz ± 22 kHz, +0.1, ±0.5 dB ±1 dB at 50 kHz
(relative to 1 kHz level with 150 Ω source)
Equivalent Input Noise
±126 dBu (±128 dBV) maximum
(150 Ω source, flat weighting, 22 Hz ± 22 kHz bandwidth for gain settings of 36 dB or greater)
Output Clipping Level
+22 dBu minimum with 100 kΩ load
+20 dBu minimum with 600 Ω load
Input Clipping Level
+4 dBu minimum at the 0 or +18 dB gain setting
Dynamic Range
122 dB minimum at the +18 dB gain setting
THD + Noise
0.05% maximum
(from 50 Hz to 22 kHz @ +4 dBu output level,
22 Hz ± 22 kHz filter bandwidth, +46 dB gain setting)
Common Mode Rejection Ratio:
100 dB minimum at 80 Hz
60 dB minimum at 10 kHz
Input
Output
Low Cut
80 Hz or 160 Hz (switch selectable), 6 dB per octave
Phantom Power
12V or 48V (switch selectable) per DIN 45 596
Limiter
Limits to +17 dBu output level 10:1 limiting ratio
5 ms attack time, 100 ms release time Amber/Red LED indicates limiting/clipping
Internal Voltage Rails
+15 V and ±15 V, regulated
Power
2 AA batteries, 24 hours life typical with +4 dBu signal into 600 Ω, no phantom power
Power LED
Green indicates power and good battery.
Red indicates power and low battery. LED turns red when approximately 4 hours of battery life remain.
Polarity
Mic input to line output is
Operating Temperature Range
±18 to 57 degrees C 0 to 135 degrees F
Printed in U.S.A.