Shure Microflex MX391 Series Bedienungsanleitung

MX391

Surface Mount Microphones

The Shure small, surface-mounted electret condenser microphone series, MX391, user guide.

Version: 5 (2019-J)

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Table of Contents

MX391Surface Mount Microphones 3

General Description 3

Model Variations 3

Interchangeable Cartridges 3

RFI Filtering 4

Microphone Placement 4

Permanent Installation 4

Preamp Gain 5

Specifications 5

Furnished Accessories 7

Certifications 7

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•

MX391

Surface Mount Microphones

General Description

Shure Microflex MX391 Series microphones are small, surface-mounted electret condenser microphones designed for mount-

ing on conference tables, stage floors, and lecterns. Their high sensitivity and wide frequency range make them especially suit-

able 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.

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Cartridge Polar Patterns

RFI Filtering

Important: Microphones must be used with the RK100PK or RK202PK plate-mounted preamp to optimize RF immunity.

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.

Permanent Installation

Remove grille.

Place housing in position and mark location of screw holes and bottom cable exit hole.

Drill starter hole for each screw and a 1/2 in. bottom exit hole for the mic cable.

Insert 4-pin mini-connector and cable through cable hole.

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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.

Specifications

All measurements taken with microphone mounted on a wooden surface (76 x 76 cm)

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

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Self 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

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

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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

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: +49-7262-92 49 0

Fax: +49-7262-92 49 11 4

Email: [email protected]

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