Shure Microflex MX391 Series User manual

© 2016 Shure Incorporated
27A14048 (Rev. 3)
WIRED MICROPHONE
MX391
USER GUIDE
MICROFLEX SERIES
Printed in U.S.A.
Le Guide de l’Utilisateur
Guia del Usuario
Guida dell’Utente
Bedienungsanleitung
取扱説明書
Manual do Usuário

4
Surface Mount Microphones
Shure Microflex®MX391 Series microphones are small, surface-mounted 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 reinforcement and recording
applications.
• Flat frequency response across the vocal range for uncolored sound
• Interchangeable cartridges that provide a choice of polar pattern for each
application
• Sleek, low-profile design for unobtrusive appearance
• RF filtering
Model Variations
Microflex MX391 microphones are available in black or white.
The polar pattern of the included cartridge is indicated by a model number suffix:
/C Cardioid
/S Supercardioid
/O Omnidirectional
/N Cartridge not included
Interchangeable Cartridges
Microflex microphones use interchangeable cartridges that allow you to choose the
polar pattern for different installations.
Omnidirectional Supercardioid Cardioid
R183 R184 R185
Cartridge Polar Patterns
Microphone Placement
For best low-frequency response
and rejection of background
noise, place the microphone on
a large, flat surface, such as a
floor, table, or lectern.
To reduce reverberance, avoid
reflective surfaces above or to
the side of the microphone, such
as beveled sides of pulpits or
overhanging shelves.
MX395/C
130° @ -3dB
MX395/BI
2 x 90° @ -3dB
MX395/O
360°
Permanent Installation
Permanent Installation
1. Remove grille.
2. Place housing in position and
mark location of screw holes
and bottom cable exit hole.
3. Drill starter hole for each
screw and a 1/2 in. bottom
exit hole for the mic cable.
4. Insert 4-pin mini-connector and
cable through cable hole.
5. Replace grille with screw.
Do not overtighten.
Do not attempt to detach the cable from
the microphone, as damage may result.
Preamp Gain
If necessary, the preamplifier gain can be reduced by 12 dB. Contact an authorized
Shure service center for information.
R6 and R4
R13 and R16
Q8
Q9
Q2
Q6
Q1
Q5
Q3
D1
Q4
Q7
C10
C11
C6
C9
C3
C11
RFI Filtering
Important: Microphones must be used with the RK100PK and RK202PK
plate-mounted preamp to optimize RF immunity.

5
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
MX391/C Cardioid
MX391/S Supercardioid
MX391/O Omnidirectional
Output Impedance
180Ω
Output Configuration
Active Balanced
Sensitivity
@ 1 kHz, open circuit voltage
Cardioid –30 dBV/Pa (33.5 mV)
Supercardioid –28 dBV/Pa (38.5 mV)
Omnidirectional –22 dBV/Pa (81.4 mV)
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
Omnidirectional 15 dB SPL
Supercardioid 21 dB
Signal-to-Noise Ratio
Ref. 94 dB SPL at 1 kHz
Cardioid 71 dB
Omnidirectional 80 dB
Supercardioid 73 dB
Dynamic Range
1 kΩ load, @ 1 kHz
96 dB
Common Mode Rejection
45 dB, minimum
Preamplifier Output Clipping Level
at 1% THD
–6 dBV (0.5 V)
Polarity
Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of
output XLR connector
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
Condenser Cartridge Impedance Converter
Red
Black
Shield
Microphone Wiring Diagram
Note: Yellowing of any plastic material can be caused from cigarette smoke, ultra
violet rays, and other chemical interactions. Once plastic has yellowed, there typically
is no cleaning method that will restore the whiteness.
Furnished Accessories
Carrying/Storage Bag 95A2313
RFI Resistant, Inline Preamp for all MX Models (Black) RK100PK
Allen wrench (No. 4) 80A67
Replacement Parts
Black or White Omnidirectional Cartridge for all MX-
(Microflex®) Models and WL183 R183B
Black or White Supercardioid Cartridge for all MX-
(Microflex®) and WL183, WL184 and WL185 Models R184B
Black or White Cardioid Cartridge for WL185 and all MX-
(Microflex®) Models R185B
RFI Resistant, Inline Preamp for all MX Models (Black) RK100PK
RFI Resistant, Inline Preamp for all MX Models (White) RK100PKW
Certifications
Meets essential requirements of all applicable European Directives.
Eligible for CE marking.
The CE Declaration of Conformity can be obtained from Shure Incorporated or any of
its European representatives. For contact information please visit www.shure.com
The CE Declaration of Conformity can be obtained from: www.shure.com/europe/
compliance
Authorized European representative:
Shure Europe GmbH
Headquarters Europe, Middle East & Africa
Department: EMEA Approval
Jakob-Dieffenbacher-Str. 12
75031 Eppingen, Germany
Phone: [phone]
Fax: [phone]
Email: [email protected]

cm4.158
(1.637 in.)
5.304 cm
(2.088 in.)
1.905 cm (.750 in.)
7.940 cm
(3.126 in.)
SIDE (3/4 SCALE) CÔTÉ (ÉCHELLE 3/4) SEITENANSICHT (MASSSTAB 3:4)
COSTADO (ESCALA: 3/4 DE TAMAÑO REAL) VISTA LATERALE (SCALA 3/4) BOTTOM (ACTUAL SIZE) DESSOUS
(GRANDEUR NATURE) UNTERSEITE
(ORIGINALGRÖSSE) LADO INFERIOR
(TAMAÑO REAL) VISTA DAL BASSO (AL VERO)
3.175 cm
(1.250 in.)
2.921 cm
(1.150 in.)
.5 in. Hole
R6 and R4
R13 and R16
Q8
Q9
Q2
Q6
Q1
Q5
Q3
D1
Q4
Q7
C10
C11
C6
C9
C3
C11
GAIN SETTING
TABLE 4A •TABLEAU 4A
TABELLE 4A •TABLA 4A
TABELLA 4A
12 dB 0 dB
R6 10k0ohm
R4 10
k2
0k
R160ohm10M
R13DNP 301 ohm
赤
NERO
RED
SCHWARZ NEGRO

20 200001000 1000050 100
9876543 92 8765432
+10
0
–10
Hz
dB
-20
+20
20 200001000 1000050 100
9876543 92 8765432
+10
0
–10
Hz
dB
-20
+20
20 200001000 1000050 100
9876543 92 8765432
+10
0
–10
Hz
dB
-20
+20
MX391/O
MX391/C
MX391/S
150°
120°
150°
120°
180°
30°
60°
90°
30°
60°
0
90°
–10 dB
–20 dB
–15 dB
–5 dB
150°
120°
150°
120°
180°
30°
60°
90°
30°
60°
0
90°
–10 dB
–20 dB
–15 dB
–5 dB
MX391/O
150°
120°
150°
120°
180°
30°
60°
90°
30°
60°
0
90°
–10 dB
–20 dB
–15 dB
–5 dB
150°
120°
150°
120°
180°
30°
60°
90°
30°
60°
0
90°
–10 dB
–20 dB
–15 dB
–5 dB
MX391/C
150°
120°
150°
120°
180°
30°
60°
90°
30°
60°
0
90°
–10 dB
–20 dB
–15 dB
–5 dB
150°
120°
150°
120°
180°
30°
60°
90°
30°
60°
0
90°
–10 dB
–20 dB
–15 dB
–5 dB
500 Hz
1000 Hz
250 Hz
6300 Hz
10000 Hz
2500 Hz
MX391/S
500 Hz
1000 Hz
250 Hz
6300 Hz
10000 Hz
2500 Hz
500 Hz
1000 Hz
250 Hz
6300 Hz
10000 Hz
2500 Hz