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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,
make sure it provides a regulated +5 Vdc source (
40 μA minimum)
at pin 2 of the microphone connector, as shown in Figure 2.
MICROPHONE WIRING DIAGRAM
FIGURE 2
*Produces positive voltage at pin 2 of Shure L4/EC4 wireless receiver three-pin connector.
CONDENSER
CARTRIDGE
IMPEDANCE
CONVERTER
G
SHIELD
BLK
RED
S
D+
4
1
2
3
SPECIFICATIONS WL93 MICROPHONE (with standard test circuit
shown in Figure 3)
SM93 MICROPHONE (with preamplifier)
Type Condenser (electret bias) Condenser (electret bias)
Frequency Response (Figure 4) 50 to 20,000 Hz 80 to 20,000 Hz, 12 dB/octave rolloff below 100 Hz
Polar Pattern Omnidirectional, uniform with frequency 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 reduced clipping level)
Output Level
(1 Pascal = 94 dB SPL)
Open Circuit Voltage: –38 dBV/Pa
(13 mV)
Open Circuit Voltage: –43 dBV/Pa (7.0 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 Less than 1% at 120 dB
Maximum SPL 120 dB 120 dB
Dynamic Range (maximum SPL to
A-weighted noise level)
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 (electromagnetic) 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)
Polarity Positive pressure on microphone diaphragm
produces positive voltage on pins 3 and 4 with respect
to pin 1 (ground)*
Positive pressure on microphone diaphragm produces
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 57
o
C
(0
o
to 135
o
F)
Storage Temperatures: –29
o
to 74
o
C
(–20
o
to 165
o
F)
Operating Temperatures: –18
o
to 57
o
C (0
o
to 135
o
F)
Storage Temperatures:–29
o
to 74
o
C (-20
o
to 165
o
F)
Cable 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])
Black 1.27 m (4.17 ft), attached, two-conductor, shielded,
terminated by miniature connector type (TA4F)
Case Microphone: Black ABS thermoplastic case with
stainless-steel-mesh grille
Microphone: Black ABS thermoplastic case with
stainless-steel-mesh grille
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)