2
SPECIFICATIONS WL93 MICROPHONE (with standard test
circuit shown in Figure 1)
SM93 MICROPHONE (with preamplifier; refer to
Figures 6 and 7)
Type Condenser (electret bias)
Frequency Response (Figure
2)
50 to 20,000 Hz 80 to 20,000 Hz, 12 dB/octave rolloff below 100 Hz
Polar Pattern Omnidirectional, uniform with frequency
Output Impedance 3000 Ω Rated at 150 Ω (90 Ω actual)
Recommended minimum load impedance: 800 Ω
(May be used with loads as low as 150 Ω with re-
duced clipping level)
Output Level
(0 dB = 1 volt per mbar)
Open Circuit Voltage –58 dB (1.3 mV). .
Open Circuit Voltage: –63 dB (0.70 mV)
Output Clipping Level
(at 1,000 Hz)
0.25 V at 120 dB –18 dBV (0.13 V) minimum
Total Harmonic Distortion Less than 1% at 120 dB
Maximum SPL 120 dB
Dynamic Range (maximum
SPL to A-weighted noise lev-
el)
102 dB 98 dB
Output Noise (equivalent
SPL)
18 dB typical, A-weighted 22 dB typical, A-weighted
26 dB, weighted per DIN 45 405
Hum Pickup (electromagnet-
ic)
N/A –4 dB equivalent SPL in a 1 mOe field (60 Hz)
Signal-to-Noise Ratio 76 dB at 94 dB SPL (IEC 651) 72 dB at 94 dB SPL (IEC 651)
Phasing Positive pressure on microphone dia-
phragm produces positive voltage on pins
3 and 4 with respect to pin 1 (ground)*
Positive pressure on microphone diaphragm pro-
duces positive voltage on pin 2 relative to pin 3 of
preamplifier output cable connector
Recommended Operating
Voltage
2 to 10 V; 5 V nominal (pin 2 to pins 3 and
4)
11 to 52 Vdc phantom. Protected against reverse
voltage application
Current Drain
40 mA typical
0.33 mA
Environmental Conditions Operating Temperatures:–18
o
to 60
o
C (0
o
to 140
o
F)
Storage Temperatures:–29
o
to 66
o
C (–20
o
to 150
o
F)
Cable Black 1.27 m (4.17 ft), attached, two-con-
ductor, shielded terminated by Switch-
craft TA4F type connector (WL93T: Tan
1.27 m [4.17 ft])
Black 1.27 m (4.17 ft), attached, two-conductor,
shielded terminated by Switchcraft TA4F type con-
nector
Case Microphone: Black ABS thermoplastic
case with stainless-steel-mesh grille
Microphone: Black ABS thermoplastic case with
stainless-steel-mesh grille
p
lifier: Steel case with non reflective black
Preamplifier: Steel case with non–reflective black
finish, black–chrome belt clip
Net Weight Microphone: 16 g (0.57 oz) Microphone: 16 g (0.57 oz)
Preamplifier:118 g (4.17 oz)
*Produces positive voltage at pin 2 of Shure L4/EC4 wireless receiver three–pin connector.
1
2
4
3
+5V
20 K
V out
TEST CIRCUIT
FIGURE 1
TYPICAL FREQUENCY RESPONSE
FIGURE 2
500 1,000 2,000 5,000 10,000 20,00050 100 20020
0
+10
–10
SM93
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General
Weight and Dimensions
