Microflex MX393 - Microphone SHURE - Free user manual and instructions

Product type	Boundary microphone
Brand	Shure
Model	Microflex MX393
Category	Professional microphone
Transducer	Electret condenser
Polar pattern	Cardioid
Frequency response	50 Hz – 17 000 Hz
Output impedance	150 Ω (balanced)
Sensitivity (at 1 kHz, open circuit)	-32 dBV/Pa (25 mV/Pa)
Power requirement	Phantom power 11–52 V DC
Output connector	XLR male 3-pin
Dimensions (L × l × H)	107 × 64 × 23 mm
Net weight	0.5 kg
Housing material	Die-cast zamak
Finish	Matte black
Operating temperature	-30 °C to +74 °C
Relative humidity	0 to 95 % (non-condensing)
Key features	Clear speech capture for conferences, meeting tables, and courtrooms. Low-profile discreet design. Adjustable DIP switch for low-cut filter and attenuation.
Care and cleaning	Wipe with a soft, dry cloth. Do not use solvents or abrasive cleaners. Disconnect before cleaning.
Safety	Do not disassemble. No user-serviceable parts. Risk of electric shock if housing is opened. Use only with phantom power compatible equipment.
Spare parts and repairability	Contact Shure customer service or an authorized dealer for repairs. No spare parts available for the general public.
General information	2-year warranty (depending on country). Certified compliant with CE and FCC standards. Made in China.

Frequently Asked Questions - Microflex MX393 SHURE

How to power the Microflex MX393?

The microphone requires phantom power of 11 to 52 V DC provided by a compatible mixing console or preamp. Ensure the equipment is set to send phantom power.

What type of connector does the MX393 use?

It features a standard XLR male 3-pin connector. Use an XLR female cable to your audio equipment.

Can I use this microphone on a glass table?

Yes, the MX393 is designed to be placed on a flat surface. The zamak housing provides good stability. For delicate surfaces, you can place a non-slip pad underneath.

How to activate the low-cut filter?

The microphone has an internal DIP switch to activate a low-cut filter at 80 Hz. Carefully open the bottom cover and toggle the corresponding switch. Refer to the diagram in the manual.

Does the MX393 work with a computer sound card?

Yes, provided the sound card has a microphone input with phantom power. Most professional audio interfaces allow this. The 3.5 mm jack inputs on consumer computers do not supply phantom power.

What is the microphone's directivity?

The MX393 has a cardioid polar pattern. It primarily captures sound in front of the microphone while attenuating noise from the back and sides.

How to reduce ambient background noise?

Use the low-cut filter to attenuate low-frequency vibrations. Place the microphone on a stable surface, away from mechanical noise sources (fans, projectors). An isolation pad can also help.

Can I use multiple MX393 together?

Yes, they can be used in a network. To avoid phase issues, follow the 3:1 rule (distance between microphones at least three times the distance to the sound source). A multi-channel mixing console is recommended.

Is the microphone compatible with speech recognition software?

Yes, its extended frequency response and clarity make it suitable for speech recognition. Ensure you set the input level to avoid clipping and position the microphone within 50 cm of the source.

What to do if the microphone produces no sound?

First check that phantom power is enabled on the mixing console. Test with another XLR cable. Make sure the mixing channel is not muted and the gain is high enough. If the problem persists, the microphone may be defective.

USER MANUAL Microflex MX393 SHURE

Black electronic device with ventilation grille and cable, no visible text or symbols

MX392 MX393

Black desktop microphone with adjustable neck and front-mounted probe (no visible text or symbols)

MX300 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

• 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 (MX392 models only)
• RF filtering

Model Variations

MX392: Attached, unterminated cable and programmable logic input and output.

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

/○ Omnidirectional

Interchangeable Cartridges

Microflex microphones use interchangeable cartridges that allow you to choose the polar pattern for different installations.

Permanent Installation

MX392 & MX393

1. Remove grille to access mounting key holes.
2. Cut slots into pads.
3. Slide microphone forward to engage screws in slots.
   If using rear side-exit cable option, only drill two outer holes. If re-routing for cable bottom exit, (MX392 only), drill all three 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.

Configuration

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.

	OFF (factory default)	ON
1	Momentary Toggle
2	Push-to-mute Push-to-talk
3	Mute button enabled, LED illuminates when mic is active	Disable mute button (microphone always on), logic controls LED
4 --	--

Wiring

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

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

Logic Wiring

Diagram of a soldering iron plug with three terminal pins and a curved wire, showing electrical contact (no text or symbols)

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.

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.

Re-Routing Cable for Bottom Exit (MX392 Only)

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.

Painting

A supplied plastic paint shield
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.

Specifications

Type

Condenser (electret bias)

Frequency Response

50–17000 Hz

Polar Pattern

MX412D/C, MX418D/C: Cardioid

MX412D/S, MX418D/S: Supercardioid

Output Impedance

EIA Rated at 150 Ω (180 Ω actual)

Output Configuration

Active balanced

Sensitivity (at 1 kHz, open circuit voltage)

Cardioid: -34 dBV/Pa (21 mV)

Supercardioid: -33 dBV/Pa (24 mV)

Omnidirectional: -28 dBV/Pa (40 mV)

1 Pascal=94 dB SPL

Maximum SPL (1 kHz at 1% THD, 1 kΩ load)

Cardioid: 123 dB

Supercardioid: 122 dB

Omnidirectional: 117 dB

Equivalent Output Noise (A-weighted)

Cardioid: 29 dB SPL

Supercardioid: 28 dB SPL

Omnidirectional: 71 dB SPL

Signal-to-Noise Ratio (referenced at 94 dB

SPL at 1 kHz)

Cardioid: 65 dB

Supercardioid: 66 dB

Omnidirectional: 71 dB

Dynamic Range (1 kΩ load at 1 kHz)

94 dB

Common Mode Rejection (10 Hz to 100 kHz)

45 dB minimum

Preamplifier Output Clipping Level (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.

Net Weight

MX412D: 0.81 kg (1.80 lbs)

MX418D: 0.82 kg (1.82 lbs)

Packaged Weight

MX412D: 1.63 kg (3.62 lbs)

MX412D: 1.64 kg (3.64 lbs)

Logic Connections

LED IN: Active low (≤1.0V), TTL compatible.

Absolute maximum voltage: -0.7V to 50V.

LOGIC OUT: Active low (≤1.0V), sinks up to

20mA, TTL compatible. Absolute maximum voltage: -0.7V to 50V (up to 50V through 3kΩ).

Mute Switch Attenuation

-50 dB minimum

Cable

3 m (10 ft) attached cable with shielded audio pair terminated at a 3-pin male XLR and three

unterminated conductors for logic control

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 Vdc phantom, 2.0 mA

Furnished Accessories

Zipper Bag 95B2313

Paint Mask 80C514

Switch Paint Mask 80A541

Paint Plug 36A664

Replacement Parts

Omnidirectional Cartridge (Black) R183B

Supercardioid Cartridge (Black) R184B

Cardioid Cartridge (Black) R185B

12' (3.7m) Cable 3-Pin Miniature

Connector (TA3F) to male XLR C129

(MX393)

Custom Logic Cable (specify 95R2509

length) 95B2509

Custom logic cable with threaded G130

adapter (MX392) C130

CERTIFICATION

Eligible to bear CE Marking. Conforms to

European EMC Directive 2004/108/EC. Meets

Harmonized Standards EN55103-1:1996 and

EN55103-2:1996, for residential (E1) and light industrial (E2) environments.

The Declaration of Conformity can be obtained

from:

Authorized European representative:

Shure Europe GmbH

Headquarters Europe, Middle East & Africa

Department: EMEA Approval

Wannenacker Str. 28

D-74078 Heilbronn, Germany

Phone: [phone]

Fax: [phone]

Email: [e-mail]

Alternance : initial = 5 V c.c., appuyer = 0 V c.c.

Bornes logiques

Diagram of a soldering iron plug with three terminal pins connected to a wire, showing electrical winding (no text or symbols)

Diagram of a mechanical or electrical component with labeled parts and directional arrows (no readable text or symbols)

Pure mechanical assembly diagram showing a pipe connection with a directional arrow (no text or symbols)

Diagram of a mechanical assembly with a tool and directional arrow (no text or symbols)

Technical diagram showing two mechanical assembly steps with arrows indicating movement (no text or symbols)

Peinture

MX412D: 1.63 kg (3.62 lbs)

MX412D: 1.64 kg (3.64 lbs)

Connexions logiques

11–52 V c.c. fantôme, 2,0 mA

Accessoires fournis

D-74078 Heilbronn, Germany

Phone: [phone]

Fax: [phone]

Email: [e-mail]

Mikrofonaufstellung

Diagram of a soldering iron plug with three terminal pins and a curved wire, showing electrical contact (no text or symbols)

MX412D: 1.63 kg (3.62 lbs)

MX412D: 1.64 kg (3.64 lbs)

Logikanschlüsse

11–52 V DC Phantomspeisung, 2,0 mA

Headquarters Europe, Middle East & Africa

D-74078 Heilbronn, Germany

Tel: [phone]

Fax: [phone]

Email: [e-mail]

Diagram of a plug with wires and a terminal connector, no text or symbols present

MX412D: 1.63 kg (3.62 lbs)

MX412D: 1.64 kg (3.64 lbs)

Conexiones lógicas

D-74078 Heilbronn, Germany

Phone: [phone]

Fax: [phone]

Email: [e-mail]

Diagram of a soldering iron plug with three terminal pins connected to a terminal outlet (no text or symbols)

MX412D: 1.63 kg (3.62 lbs)

MX412D: 1.64 kg (3.64 lbs)

Collegamenti logici

D-74078 Heilbronn, Germany

Phone: [phone]

Fax: [phone]

Email: [e-mail]

MX300

バウンダリーマ

イクロホン

マイクロホンの配置

ミュートボタン設定

Diagram of a soldering iron plug with three terminal pins, showing winding and pin connections (no text or symbols)

MX412D: 1.63 kg (3.62 lbs)

MX412D: 1.64 kg (3.64 lbs)

ロジックコネクター

D-74078 Heilbronn, Germany

Phone: [phone]

Fax: [phone]

Eメール：[e-mail]

CARDIOID
CARDIOIDE CARDIOIDE
KARDIOID CARDIOIDE

250 Hz
--- 500 Hz
— — — 1000 Hz

2600 Hz
- - - - 6400 Hz
— — — 10000 Hz
CARDIOIDE CARDIOIDE
KARDIOID CARDIOIDE

Hz
OMNIDIRECTIONAL
OMNIDIRECTIONNELLE OMNIDIRECCIONAL
ALLE RICHTUNGEN OMNIDIREZIONALE

250 Hz
- - - - 500 Hz
——1000 Hz

2600 Hz
- - - - 6400 Hz
——10000 Hz
OMNIDIRECTIONAL NNELLE OMNIDIRECCIONAL

OMNIDIREZIONALE OMNIDIREZIONALE ALLE RICHTUNGEN OMNIDIREZIONALE

SHURE®

United States, Canada, Latin

America, Caribbean:

Shure Incorporated

5800 West Touhy Avenue

Niles, IL 60714-4608 USA

Phone: [phone]

Fax: [phone] (USA)

Fax: [phone]

Email: [e-mail]

www.shure.com

©2011 Shure Incorporated

Europe, Middle East, Africa:

Shure Europe GmbH

Jakob-Dieffenbacher-Str. 12,

75031 Eppingen, Germany

Phone: [phone]

Fax: [phone]

22/F, 625 King's Road

North Point, Island East

Hong Kong

Phone: [phone]

Fax: [phone]