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POWERING THE SM93 PREAMPLIFIER
Power the preamplifier supplied with the SM93 using any phantom
supply providing 11 to 52 Vdc, such as the Shure Model PS1A
Power Supply.
SM93 PREAMPLIFIER IMPEDANCE
Use a minimum load impedance of 800 Ω or greater for maximum
signal handling and minimum distortion. Load as low as 150 Ω can
be used, but a reduction in output clipping level will result. Note that
the power supply itself may add loading (3300 Ω in the Shure
PS1A) to the microphone.
USING OTHER PREAMPLIFIERS OR BODY-PACKS
If connecting the 93 microphone to anything OTHER than a Shure
wireless body-pack or the preamplifier supplied with the SM93,
SPECIFICATIONS
Type
Frequency Response (Figure 4)
Polar Pattern
Output Impedance
Output Level
(1 Pascal = 94 dB SPL)
Output Clipping Level
(at 1,000 Hz)
Total Harmonic Distortion
Maximum SPL
Dynamic Range (maximum SPL to
A-weighted noise level)
Output Noise (equivalent SPL)
Hum Pickup (electromagnetic)
Signal-to-Noise Ratio
Polarity
Recommended Operating Voltage
Current Drain
Environmental Conditions
Cable
Case
Net Weight
*Produces positive voltage at pin 2 of Shure L4/EC4 wireless receiver three-pin connector.
WL93 MICROPHONE (with standard test circuit
shown in Figure 3)
Condenser (electret bias)
50 to 20,000 Hz
Omnidirectional, uniform with frequency
3000 Ω
Open Circuit Voltage: –38 dBV/Pa
(13 mV)
0.25 V at 120 dB
Less than 1% at 120 dB
120 dB
102 dB
18 dB typical, A-weighted
N/A
76 dB at 94 dB SPL (IEC 651)
Positive pressure on microphone diaphragm
produces positive voltage on pins 3 and 4 with respect
to pin 1 (ground)*
2 to 10 V; 5 V nominal (pin 2 to pins 3 and 4)
40 mA typical
Operating Temperatures:
Storage Temperatures:
Black 1.27 m (4.17 ft), attached, two-conductor,
shielded, terminated by miniature connector type
TA4F (WL93T: Tan 1.27 m [4.17 ft])
Microphone: Black ABS thermoplastic case with
stainless-steel-mesh grille
Microphone: 16 g (0.57 oz)
make sure it provides a regulated +5 Vdc source (
at pin 2 of the microphone connector, as shown in Figure 2.
CONDENSER
IMPEDANCE
CARTRIDGE
CONVERTER
G
MICROPHONE WIRING DIAGRAM
SM93 MICROPHONE (with preamplifier)
Condenser (electret bias)
80 to 20,000 Hz, 12 dB/octave rolloff below 100 Hz
Omnidirectional, uniform with frequency
Rated at 150 Ω (90 Ω actual)
Recommended minimum load impedance: 800 Ω (May be
used with loads as low as 150 Ω with reduced clipping level)
Open Circuit Voltage: –43 dBV/Pa (7.0 mV)
–18 dBV (0.13 V) minimum
Less than 1% at 120 dB
120 dB
98 dB
22 dB typical, A-weighted
26 dB, weighted per DIN 45 405
–4 dB equivalent SPL in a 1 mOe field (60 Hz)
72 dB at 94 dB SPL (IEC 651)
Positive pressure on microphone diaphragm produces
positive voltage on pin 2 relative to pin 3 of preamplifier
output cable connector
11 to 52 Vdc phantom. Protected against reverse voltage
application
0.33 mA
o
o
–18
to 57
C
Operating Temperatures: –18
o
o
(0
to 135
F)
Storage Temperatures:–29
o
o
–29
to 74
C
o
o
(–20
to 165
F)
Black 1.27 m (4.17 ft), attached, two-conductor, shielded,
terminated by miniature connector type (TA4F)
Microphone: Black ABS thermoplastic case with
stainless-steel-mesh grille
Preamplifier: Steel case with non-reflective black finish,
black-chrome belt clip
Microphone:16 g (0.57 oz)
Preamplifier:118 g (4.17 oz)
2
40 μA
RED
D+
BLK
S
SHIELD
FIGURE 2
o
o
o
to 57
C (0
to 135
o
o
o
to 74
C (-20
to 165
minimum)
1
3
4
2
o
F)
o
F)
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