Shure MX391 User Manual
MODEL MX391 SERIES MICROPHONES
MODEL VARIATIONS
MX391 and MX391W (white) m odels h ave a n attached 4 m eter (12
ft) cable t erminated with a 4-pin m ini c onnector a nd a s eparate p reamplifier. A rubber strain relief is provided for applications where you
want to remove the 4–pin mini connector and connect the microphone cable directly to screw terminals in the preamplifier.
MX391LP and MX391WLP (white) models have an attached 4
meter (12 ft) cable t erminated w ith a 4–pin mini connector, but do not
include a preamplifier. I nstead, t he m icrophone c an b e c onnected d irectly to a Shure wireless body-pack transmitter.
Microflex
boundary microphones come with one of three inter-
Model MX391 Series Microphones
Specification Sheet
OVERVIEW
Shure Microflex MX391 Series microphones are small, surfac emounted electret condenser microphones designed for mounting on
conference tables, stage floors, and lecterns. Their high sensitivity
and wide frequency range make them especially suitable for picking
up speech and vocals in sound r einforcement and r ecording a pplications.
FEATURES
S Flat frequency response across the vocal range for uncolored
sound
S Interchangeable cardioid, supercardioid, and omnidirectional
cartridges that provide optimal choice for each application
S Sleek, low-profile design for unobtrusive appearance
S Balanced, transformerless output for increased immunity to noise
over long cable runs
changeable cartridges, a s i ndicated b y t he m odel n umber ( found o n t he
bottom of the microphone base).
MX391/C series. Cardioid pickup pattern for general sound rein-
forcement applications. Pickup angle (–3 dB) = 130°.
MX391/S series. Supercardioid p ickup pattern f or sound reinforcement applications requiring narrow or more distant coverage. Pickup angle (–3 dB) = 115°.
MX391/O series. Omnidirectional pickup pattern for recording or
remote monitoring applications. Pickup angle = 360°.
SPECIFICATIONS
Polar Pattern (Figure 4)
Cardioid (MX391/C, MX391W/C, MX391LP/C, MX391WLP/C)
Supercardioid (MX391/S, MX391W/S, M X391LP/S, M X391WLP/S)
Omnidirectional (MX391/O, MX391W/O, MX391LP/O,
MX391WLP/O)
Environmental Requirements
Operating Temperature Range: –18° C to 57° C (0° F to 135° F)
Relative Humidity: 0 to 95%
Dimensions
See Figure 2
Wiring Diagram (Figure 1)
PIN 1 = SHIELD (use only HALF of
the shield, the other half solder to
3
1
4
2
PREAMPLIFIER SPECIFICATIONS
These specifications apply only to the MX391/MX391W microphones when used with the supplied preamplifier. All measurements
taken with the microphone mounted on a wooden surface 76.2 cm
E2002, Shure Incorporated
cable clamp)
PINS 3 and 4 = BLACK LEAD
(jumped)
PIN 2 = RED LEAD
WIRING DIAGRAM
Figure 1
x 76.2 cm (30 in. x 30 in.) and with the sound source incident at 30°
with respect to the surface plane.
Frequency Response (Figure 3)
50 to 17,000 Hz
Output Impedance (at 1000 Hz)
Rated at 150Ω (180Ω actual)
Open Circuit Sensitivity
Cartridge Type
Cardioid –29.6 dB (33.5 mV)
Supercardioid –28.3 dB (38.5 mV)
Omnidirectional –21.5 dB (81.4 mV)
*1 Pascal = 94 dB SPL
Maximum Sound Pressure Level
(1 kHz at 1% Total Harmonic Distortion, 1 kΩ load)
Cardioid: 118.8 dB
Supercardioid: 117.5 dB
Omnidirectional: 110.7 dB
Signal to Noise Ratio (referenced at 94 dB SPL)
Cardioid: 71.4 dB
Supercardioid: 72.7 dB
Omnidirectional: 79.5 dB
1 kHz ref. 1 V per
Pascal *
MODEL MX391 SERIES MICROPHONES
Specification Sheet
Equivalent Output Noise (A-weighted)
Cardioid: 22.6 dB SPL
Supercardioid: 21.3 dB SPL
Omnidirectional: 14.5 dB SPL
Dynamic Range
at 1 kΩ Load
96.2 dB
Common Mode Rejection
45 dB minimum, 10 Hz to 100 kHz
Preamplifier Output Clipping Level
–6 dBV (0.5 V)
Polarity
Positive sound pressure on diaphragm produces positive voltage
on pin 2 relative to pin 3 of the preamplifier XLR output connector.
Power Requirements
11 to 52 Vdc phantom
2.0 mA current consumption
Certification
Eligible to bear CE Marking. Conforms to European EMC
Directive 89/336/EEC. Meets applicable tests and performance
criteria in European Standard EN55103 (1996) parts 1 and 2, for
residential (E1) and light industrial (E2) environments.
REPLACEMENT PARTS
Omnidirectional Cartridge R183B
Supercardioid Cartridge R184B
Cardioid Cartridge R185B
Preamplifier Kit RK183PK
Replacement Cable Kit (black) C123
Replacement Cable Kit (white) C125
4.158 cm
(1.637 in.)
2.921 cm
(1.150 in.)
1.905 cm (.750 in.)
7.940 cm
(3.126 in.)
SIDE (3/4 SCALE) S CÔTÉ (ÉCHELLE 3/4) S SEITENANSICHT (MASSSTAB 3:4) S
COSTADO (ESCALA: 3/4 DE TAMAÑO REAL) S VISTA LATERALE (SCALA 3/4)
5.304 cm
(2.088 in.)
DIMENSIONS
Figure 2
3.175 cm
(1.250 in.)
BOTTOM (ACTUAL SIZE) S DESSOUS
(GRANDEUR NATURE) S UNTERSEITE
(ORIGINALGRÖSSE) S LADO INFERIOR
(TAMAÑO REAL) S VISTA DAL BASSO (AL VERO)
2
Loading...