Shure MX393, MX392 User Manual

MX392-MX392BE-MX393

Remove Grille

Remove Bracket

Cartridge

R183

R184

R185

Omnidirectional

Supercardioid

Cardioid

Boundary Microphones

Shure Microflex® MX300 Series microphones are
surface-mounted electret condenser microphones
designed primarily 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.
Interchangeable cartridges provide the installer
with greater flexibility and make it possible to eas­ily reconfigure microphone coverage as the need
arises. The MX392 and MX393 models include an
internal preamplifier.

MX300 Series microphones take advantage of
the principle that, at a barrier or boundary, the
sound pressure level doubles. When placed near
a sufficiently large boundary surface, the micro­phone has 6 dB higher sensitivity and approxi­mately 3 dB greater direct-to-reverberant sound
ratio.

Features

The MX392, MX392BE, and MX393 feature pro­grammable logic input and output. Additionally
they provide following benefits:

• 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 surface mounting

• Programmable mute button

• LED indicator

• Logic input/output for remote control or use
with automatic mixers

• RF filtering

Model Variations

MX392: Attached, unterminated cable.
MX392BE: Attached, unterminated cable
configured at the factory for bottom exit.
MX393: Detachable cable with XLR output

connector.
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.

Cartridge Polar Patterns

Permanent Installation

MX392 and MX393

1. Remove grille to access mounting key holes.

2. Cut slots into pads.

3. Slide microphone forward to engage screws in
slots.

Note: If using rear side-exit cable option, only drill
two outer holes.

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.

12.7 mm

(1/2 in.)

MX392BE/C

MICROFLEX

MX392BE

Once placement has been determined, the microphones can be permanently installed. First, drill the
hole in the selected area to allow the bottom entry cable to be conveniently routed out of sight. Then
use the pressure sensitive adhesive to keep the microphone firmly in place.

Drilling the hole:

1. Determine the cutting area for the bottom exit cable and drill a 1/2" (12.7 mm) circular hole.
Remove all debris from the mounting surface.

2. Route the cable through the drilled hole.

3. Connect the integrated XLR cable to a mixer or P.A. system.

Re-Routing Cable for Bottom
Exit (If your MX392 is not BE
configured)

1. Remove the grille.

2. Disconnect wires from screw terminals.

3. Grasp rubber boot within 1/2" of housing, us­ing gas pliers. Rotate boot and cable ccw to
remove connector from threaded "L" bracket.

4. Remove cable from microphone housing.

5. Insert cable through access hole in micro­phone base.

6. Insert cable connector through hole and
thread it into "L" bracket.

7. If desired, rubber strain relief can be reat­tached to cable end or removed from cable
before fastening it to bracket.

8. Re-connect wires to proper screw terminals
on circuit board.

9. Insert supplied round rubber plug into unused
side cable exit.

10. Reinstall grille and foam screen.

11. Insert cable through hole in mounting
surface. Secure microphone to mounting
surface.

Pressure Sensitive Adhesive

1. Thoroughly clean the application area with
the included alcohol wipe. Removing the dust
will allow the microphone to adhere well.

2. Remove the adhesive backing and gently set
the microphone into position.

3. Once the microphone is in position, firmly ap­ply pressure to the microphone.

Note: The pressure sensitive adhesive will be
extremely difficult to move once pressure has
been applied.

Bottom view of MX392BE/C with adhesive

pads

Configuration

Ground (Green)

SWITCH OUT (White)

LED IN (Orange)

Audio + (Red)

Audio – (Black)

DIP Switches

Use the DIP switches to configure logic settings
and mute button behavior.

The DIP switches are covered with a piece of
clear tape at the factory. Remove tape to modify
the switch settings.

Note: Bottom cover must be closed for micro­phone to function.

Mute Button Configuration

Use DIP switches 1 and 2 to configure the mute
button, as follows.

Be sure to set DIP switch 3 off (factory default)
so that the mute button controls audio from the
microphone.

Switch Function DIP Switch Setting

Momentary: push-to-mute
(as shipped).

Momentary: push-to-talk

Toggle: (Push On/Push
Off): Mic is active when
powered on

Toggle: (Push On/Push
Off): Mic is mute when
powered on

Logic Wiring

Green (LOGIC GROUND): Connects to the

logic ground of an automatic mixer, switcher, or
other equipment.

Orange (LED IN): Set DIP switch 3 on to use
LED IN. When shorted to LOGIC GROUND, the
LED turns on.

White (SWITCH OUT): Provides TTL logic
(0 Vdc or 5 Vdc) in response to the mute button.
Set DIP switch 1 for momentary or toggle. When
phantom power is applied, logic initializes high
(5 Vdc). DIP switch 2 has no effect on SWITCH
OUT.

OFF (factory
default)

1 Momentary Toggle

2 Push-to-mute Push-to-talk

3 Mute button enabled,

LED illuminates when
mic is active

4 -- --

ON

Disable mute button
(microphone always
on), logic controls
LED

Wiring Diagram

NOTE: Audio and logic ground are connected at

microphone base.

Connecting to an Automatic
Mixer

Use these settings if connecting the microphone
to an automatic mixer or other device that mutes
audio and controls the LED.

1. Connect logic leads to the automatic mixer.
Connect the LED IN to the gate output to
illuminate the LED when that channel is gated
on.

2. Set DIP switch 3 on. This disbles the mute
button (the microphone passes audio regard­less of whether the button is pressed or not).

3. Set DIP switch 1 to configure how the mute
button sends SWITCH OUT logic:

Momentary:

push = 0 Vdc,

release = 5 Vdc

Toggle:

initial = 5 Vdc,

push = 0 Vdc

Changing SWITCH OUT to
Always Momentary

Use the following modification in situations
where your logic interface requires momentary
closure of the SWITCH OUT, but you want the
mute button to toggle the microphone (DIP
switch 1 ON, 3 OFF):

1. Access the circuit board inside the micro­phone base.

2. Remove the resistor at R45 and reinstall it at
location R46.

A supplied plastic paint shield

ABC

DEF

B retainer
C grille
D foam screen
E supplied adhesive masking strip
F supplied rubber plug

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.

SpecificationsPainting

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

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 produc­es positive voltage on pin 2 relative to pin 3 of
output XLR connector

Mute Switch

50–20000 Hz

–50 dBminimum

Logic Connections

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 shield-

ed audio pair and three conductors for
logic control, unterminated

MX392BE 3½ m (12 ft) attached cable with shield-

ed audio pair and three conductors for
logic control, unterminated, 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

Dynamic Range

1kΩload,@1kHz

96 dB

Accessories

Furnished Accessories

Set of 5 rubber pads with adhesive (MX392BE) RPM470

Replacement Parts

Paint Mask 80C514

Switch Paint Mask 80A541

Black or White Omnidirectional Cartridge for all MX-

(Microflex®) Models and WL183

Black or White Cardioid Cartridge for WL185 and all MX-

(Microflex®) Models

12' Cable, 3-Pin Mini Connector (TA3F) to Male XLR,

Used with MX393

Custom Logic Cable (specify length) 95B2509

12' Cable (5-Conductor, 2 Shielded) with threaded adapter

on microphone end to bare end for MX392

R183B

R185B

C129

C130

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: [e-mail]