Shure MX300 Microphone User Manual


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6
Painting
A supplied plastic paint shield
B retainer
C grille
D foam screen
E supplied adhesive masking strip
F supplied rubber plug
A
B
C
D
E
F
1. Remove foam screen from grille before
painting
2. Clean surfaces to be painted with denatured
alcohol or naphtha.
3. To avoid filling grille holes, apply paint in thin
layers.
4. Important: Use fine sandpaper to remove
paint from the bottom edges of the grille.
This ensures electrical continuity for proper
shielding.
Specifications
All measurements taken with microphone mounted on
a wooden surface (76 x 76 cm)
Cartridge Type
Electret Condenser
Frequency Response
50–17000 Hz
Polar Pattern
MX392/C, MX392BE/C,
MX393/C
Cardioid
MX392/S, MX392BE/S,
MX393/S
Supercardioid
MX392/O, MX392BE/O,
MX393/O
Omnidirectional
Output Impedance
180Ω
Output Configuration
Active Balanced
Sensitivity
@ 1 kHz, open circuit voltage
Cardioid –30 dBV/Pa
Supercardioid –28 dBV/Pa
Omnidirectional –22 dBV/Pa
1 Pa=94 dB SPL
Maximum SPL
1kHzat1%THD,1kΩload
Cardioid 119 dB
Supercardioid 118 dB
Omnidirectional 111 dB
Equivalent Output Noise
A-weighted
Cardioid 23 dB SPL
Supercardioid 21 dB SPL
Omnidirectional 15 dB SPL
Signal-to-Noise Ratio
Ref. 94 dB SPL at 1 kHz
Cardioid 71 dB
Supercardioid 73 dB
Omnidirectional 80 dB
Dynamic Range
1kΩload,@1kHz
96 dB
Common Mode Rejection
10 Hz to 100 kHz
45 dB, minimum
Preamplifier Output Clipping Level
at 1% THD
–6 dBV (0.5 V)
Polarity
Positive sound pressure on diaphragm produc-
es positive voltage on pin 2 relative to pin 3 of
output XLR connector
Mute Switch
50–20000 Hz
–50 dBminimum
Logic Connections (MX392)
LED IN Activelow(≤1.0V),TTLcompatible.
Absolute maximum voltage: -0.7V
to 50V.
LOGIC-OUT Activelow(≤0.5V),sinksupto
20mA, TTL compatible. Absolute
maximum voltage: -0.7V to 24V (up
to50Vthrough3kΩ).
Cable
MX392 3½ m (12 ft) attached cable with
shielded audio pair and three
conductors for logic control,
unterminated
MX392BE 3½ m (12 ft) attached cable with
shielded audio pair and three con-
ductors for logic control, unterminat-
ed, bottom exit
MX393 3½ m (12 ft) detachable cable with
3-pin audio connector
Net Weight
172 g (0.38 lbs)
Environmental Conditions
Operating Temperature –18–57°C (0–135°F)
Storage Temperature –29–74°C (–20–165°F)
Relative Humidity 0–95%
Power Requirements
11–52 V DC, 2.0 mA
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