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Microflex

MX391BP Series

Boundary Microphones User Guide

27D3047 (Rev. 5)

5, Shure Incorporated

Printed in U.S.A.

GENERAL

Shure Microflex

MX391BP series microphones are small, sur-

face mounted electret condenser microphones designed for

mounting on conference tables, stage floors, and lecterns. Their

high sensitivity and wide frequency response make them especial-

ly suitable for picking up speech and vocals in sound reinforce-

ment and recording applications. The supplied MX1BP bat-

tery-powered preamplifier allows use of these microphones in sit-

uations where phantom power is not available.

FEATURES

• Flat frequency response across the vocal range for uncolored

sound

• Interchangeable cardioid, supercardioid, and omnidirectional

cartridges that provide optimal choice for anyapplication

• Sleek, low-profile design for unobtrusive appearance

• Balanced transformer output providesfor for increased

immunity to noise over long cable runs.

• MX1BP preamplifier features mic on/mute switch and power

LED indicator; works on either a 9 V battery or phantom power.

MODEL VARIATIONS

MX391BP models have a microphone an attached to a 43.7 meter

(12 ft) cable terminated with a female 4-pin mini connector. The

MX1BP preamplifier has an attached 3.7 m (12 ft) cable terminat-

ed with a 3-pin male XLR connector.

Microflex

boundary microphones come with one of three inter-

changeable cartridges, as indicated by the model number (found

on the bottom of the microphone base).

MX391/C or MX391W/C or MX391BLP/C. Cardioid pickup pat-

tern for general sound reinforcement applications. Pickup angle (-

3 dB) = 130°.

MX391/S or MX391W/S or MX391BLP/S. Supercardioid pickup

pattern for sound reinforcement applications requiring narrow or

more distant coverage. Pickup angle (-3 dB) = 115°.

MX391/O or MX391W/O or MX391BLP/O. Omnidirectional pick-

up pattern for recording or remote monitoring applications. Pickup

angle = 360°.

PERMANENT INSTALLATION

Screw holes in the microphone base and a bottom exit hole for the

microphone cable are provided for permanent installation of the

boundary microphone.

To re-route the microphone cable through

the bottom exit hole, use the following steps:

To re-route the microphone cable through the bottom exit hole,

use the following steps:

1. Remove the grille from the microphone base by loosening the

single screw on top of the grille.

2. Remove the 4-pin mini connector from the end of the cable by

cutting the cable just below the connector.

WARNING: Do not attempt to detach the cable from the micro-

phone interface.

3. Re-route cable as shown in Figure 1.

4. After threading the cable through the bottom exit hole in the

mounting surface, re-attach the 4-pin mini connector

(see Figure 4).

REPAINTING THE MX391BP

Before applying paint to the MX391BP series, remove the grille

from the base, remove the foam from the inside of the grille, and

mask the microphone cartridge and interface. Also, mask the ca-

ble where necessary.

BATTERY INSTALLATION (Figure 2)

1. Move the Mic Mute/On switch on the preamplifier to the Mute

position.

2. Press down on the OPEN side of the battery compartment cov-

er. Slide the cover back and flip it open.

3. Insert a 9 V battery as shown, observing proper battery polarity

(“+/-”). Close the battery compartment cover.

4. Move the Mic Mute/On switch on the preamplifier to the On po-

sition when ready to use the system.

NOTE: A minimal power drain occurs while the 9 V battery is

installed. To conserve battery life, remove the battery when the

preamplifier is not in use.

Service

Loop

Screw Hole

Microphone

Interface

Strain Relief Post

Bottom

Exit Hole

Top Exit

Hole

FIGURE 1

–+

FIGURE 2

1 2 3 4 5 6 ... 15 16

Resumo do Conteúdo

Página 1 - MX391BP Series

Página 2 - FIGURE 4

10RIVERNICIATURA DEL SERIE MX391Prima di verniciare l'MX391, rimuovere la griglia dalla base e laschiuma dall'interno della griglia, e prote

Página 3

11Rumore di uscita equivalente (ponderato A, a 1 kHz) Cardioide: 27,0 dB di pressione sonora (23,0 dB di pressione sonora con interruttore in posizion

Página 4 - FIGURE 1

12MUTE ONPOWERMIC25.7 mm(1.01 in.)65.2 mm(2.57 in.)84.3 mm(3.32 in.)19.1 mm(.75 in.)53.0 mm(2.09 in.)41.6 mm(1.64 in.)79.4 mm(3.13 in.)29.2 mm(1.15 in

Página 5

13200001000010001005020+100–10+100–10+100–10HzMX391BP/OMX391BP/CMX391BP/SHzHz200 500 5000200001000010001005020 2005005000200001000010001005020 200 500

Página 6 - ABBILDUNG 1

14A.C. VoltageD.C. VoltageA.C. Voltage, Mic OffD.C. Voltage, Mic OffPrinted Clrcuit GroundCase Ground(+) / (–) indicate A.C. polarity relative to inpu

Página 7

Página 8

SHURE Incorporated Web Address: http://www.shure.com5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.In U.S.A., Phone: 1-847-600-2000 Fax: 1-847-60

Página 9

2OPERATION OF MX1BP PREAMPLIFIER (Figure 3)1. With the Mic Mute/On switch in the Mute position, plug the mi-crophone into the preamplifier's 4-pi

Página 10 - FIGURA 1

3MX1BP Input ConfigurationUnbalancedMX1BP Output ConnectorMale 3-pin XLRMX1BP Output ConfigurationTransformer-BalancedCertificationMeets European Unio

Página 11 - ACCESSORIE OPZIONALI

4Peinture du serie MX391Avant de peindre le serie MX391, retirer la grille de la base, en-lever la mousse de l'intérieur de la grille et masquer

Página 12 - FIGURE 5 ABBILDUNG 5 FIGURA 5

5Pression acoustique maximum(1 kHz avec 1% de distorsion harmonique totale et charge de 1 kΩ)MX391BP/C: 133,5 dBMX391BP/S: 132,5 dBMX391BP/O: 128,0 dB

Página 13 - FIGURE 8 ABBILDUNG 8 FIGURA 8

64. Nachdem das Kabel durch die Austrittsöffnung an der Un-terseite der Befestigungsfläche geführt wurde, den 4-pin min-iatur steckverbindung (Abbildu

Página 14 - FIGURE 9 ABBILDUNG 9 FIGURA 9

7Leerlaufempfindlichkeit *1 Mikrobar = 74 dB Schalldruckpegel **1 Pascal = 94 dB Maximaler Schalldruckpegel(1 kHz bei 1 % Klirrfaktor, 1 kΩ Belastun

Página 15

8PARA VOLVER A PINTAR EL SERIE MX391BPAntes de volver a pintar el serie MX391, quite la rejilla de la base,saque el elemento de espuma del interior de

Página 16

9Relación de señal a ruido (con presión acústica de referencia de 94 dB a 1kHz con carga de 1 kΩ)Cardioide: 67,0 dBSupercardioide: 68,0 dBOmnidireccio

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