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Specifications
Gain:
Mic Input to Output, per channel, continuously variable
Output Gain Range
LINE –∞ – 66 dB
TAPE –∞ – 56 dB
Frequency Response:
20 Hz – 30 kHz, +0.2, –0.5 dB; –1 dB at 5 Hz, 50 kHz
(relative to 1 kHz level with 150 ohm source, gain controls set
at 50%)
Equivalent Input Noise:
–126 dBu (–128 dBV) minimum
(150 ohm source, flat weighting, 22 Hz – 22 kHz bandwidth,
gain control set at 50% or higher, phantom power off)
Input Clipping Level:
–10 dBu minimum
Output Clipping Level:
Line: +22 dBu minimum with 100k ohm load
+20 dBu minimum with 600 ohm load
Tape: +11 dBu (2.75 V RMS) minimum with 100k ohm load
Dynamic Range:
110 dB minimum
THD + Noise:
0.05% maximum
(from 50 Hz to 22 kHz @ +4 dBu output level, 22 Hz – 22 kHz
filter bandwidth, gain control at 50%, phantom off)
Common Mode Rejection Ratio:
100 dB minimum at 80 Hz
60 dB minimum at 10 kHz
Channel Separation:
Greater than 80 dB at 1 kHz (gain controls set to 50%)
Inputs:
Transformer-balanced, 2k ohm input impedance
Outputs:
XLR: Active, impedance-balanced, 120 ohm output impedance
Tape (3.5 mm (
1
/
8
in.)): Unbalanced, tip–left, ring–right, sleeve–
ground, 2.4k ohm output impedance
High Pass Filters:
80 Hz or 160 Hz (switch selectable), 6 dB per octave
Phantom Power:
15 V through 680 ohm resistors or 48 V through 6.8k resistors
(switch selectable)
Limiter:
Thresholds independently adjustable from
+6 dBu to +18 dBu
10:1 limiting ratio
5 ms attack time, 100 ms release time
Amber/Red LED indicates limiting/clipping
Dual mono or stereo linked
Internal Voltage Rails:
+15 V and –15 V, regulated
Metering:
7 segment GaN (Gallium Nitride) meter with 3 intensities
Peak responding
Power:
Internal: 2 AA batteries
External: 5 – 14 VDC via threaded coaxial connector* (5.5 mm
outer diameter, 2.1 mm inner diameter); Pin positive, sleeve neg-
ative; Voltages above 14 VDC cause no damage to unit, but will
open an internal poly fuse that will reset when voltage is re-
moved.
*Threaded coaxial connector provided for use with power sup-
plies not equipped. For instructions on how to solder this connec-
tor to a Shure PS20, see Figure 5.
Power LED:
Dual-color LED indicates following:
Green—external DC power or good battery.
Red—less than 1 hour of battery life remaining (with phantom
power off).
Polarity:
All inputs to all outputs, non-inverting.
Pin 2 of XLRs “hot” (to unbalanced inputs and outputs).
Operating Temperature Range:
0 to 70 degrees C (32 to 160 degrees F)
Dimensions:
43 mm x 94 mm x 140 mm (H x W x D) (1.7” x 3.7” x 5.5”)
Weight (FP24 only):
0.8 kg (1.8 lbs.)
Weight (packaged):
1.2 kg (2.6 lbs.)
EMC Certifications:
Meets FCC Part 15 Class B Emissions; Eligible to bear CE mark
(see conformance statement)
Optional Accesories
Balanced line-level-to-microphone-level
in-line adapter A15LA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FP33/FP24 Interconnection Kit A33LK. . . . . . . . . . . . . . . . . . . .
Inline Polarity Inverter A15PRS. . . . . . . . . . . . . . . . . . . . . . . . . . .