Shure Microflex MX391BP Series User manual

Microflex®MX391BP Series
Boundary Microphones User Guide
27D3047 (Rev. 5)
©2005, 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
Screw Hole
Microphone
Interface
Strain Relief Post
Bottom
Exit Hole
Top Exit
Hole
FIGURE 1
–+
FIGURE 2

2
OPERATION 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-pin mini connector. (NOTE:
Power LED Indicator will remain lit in both the On and Mute mi-
crophone modes.)
2. Plug XLR cable from the preamplifier into the respective audio
device microphone input.
3. Switch the Mic Mute/On switch to the On position.
4. Adjust the gain level of the audio input device, if necessary.
INTERNAL LOW-CUT FILTER
The MXIBP has an internal low-cut filter. As shipped from the
factory, it attenuates 6dB per octave below 25 Hz. To change the
filter to attenuate 12dB per octave below 95 Hz, follow the
instructions below:
1. Remove the three screws from the underside of the MX1BP.
2. Remove the plastic cover and lift the printed circuit board with
the attached faceplate up and out of the pack.
3. Turn over the printed circuit board and locate the jumper strad-
dling the first and second pins nearest the input jack. Reposi-
tion the jumper to straddle the second and third pins.
4. Re-assemble the MX1BP by re-seating the printed circuit
board and faceplate. Replace the plastic cover and the three
screws.
For additional technical assistance, phone Shure at 1-847-600-
8440. In Europe, phone [phone].
USE WITH PHANTOM POWER
The MX1BP can also be used in situations where phantom power
is available.
Phantom power may be applied with the 9 V battery in place or re-
moved. With the battery installed, the MX1BP will silently and au-
tomatically switch to the battery reserve should phantom power
fail. Battery depletion will not occur while phantom power is ap-
plied.
SPECIFICATIONS
These specifications apply only to the MX391 microphone when
used with the supplied MX1BP preamplifier. All measurements
taken with the microphone mounted on a wooden surface 762 mm
x 762 mm (30 in. x 30 in.).
Wiring Diagram
Polar Pattern (Figure 8 on page 12)
MX391BP/C: Cardioid (MX391BP/C )
MX391BP/S: Supercardioid (MX391BP/S)
MX391BP/O: Omnidirectional (MX391BP/O)
Polarity
Positive pressure on the diaphragm produces positive voltage on pin
2 relative to pin 3 of the output XLR connector.
Environmental Requirements
Operating Temperature Range: -18°C to 57°C (0°F to 135°F)
Relative HumidityStorage Temperature Range: -29°C to 73°C (-20°
F to 165°F0 to 95%)
Dimensions
See Figure 5 on page 11
Frequency Response (Figure 7 on page 13)
50 to 17,000 Hz
Polar Pattern (Figure 8 on page 13)
Cardioid (MX391/C)
Supercardioid (MX391/S)
Omnidirectional (MX391/O)
Output Impedance (at 1000 Hz)
EIA Rated at 150ΩΩ(115ΩΩactual)
EIA Rated at 150Ω(180Ωactual)
Open Circuit Sensitivity
*1 microbar = 74 dB SPL **1 Pascal = 94 dB SPL
Maximum Sound Pressure Level
(1 kHz at 1% Total Harmonic Distortion, 1 kΩload)
Cardioid: 133.5117.0 dB
Supercardioid: 132.516.0 dB
Omnidirectional: 128.011.5 dB
Signal to Noise Ratio
(referenced at 94 dB SPL at 1 kHz, with 1 kΩload)
Cardioid: 67.071.0 dB
Supercardioid: 72 68.0 dB
Omnidirectional: 72.5 dB
Equivalent Output Noise (A-weighted, with 1 kΩload)
Cardioid: 27.0 dB SPL (23.0 dB SPL with mute switch)
Supercardioid: 26.0 dB SPL (22.0 dB SPL with mute switch)
Omnidirectional: 21.5 dB SPL (17.5 dB SPL with mute switch)
Omnidirectional: 76.5 dB
Equivalent Output Noise (A-weighted)
Cardioid: 23.0 dB SPL
Supercardioid: 22.0 dB SPL
Omnidirectional: 17.5 dB SPL
Dynamic Range at 1 kΩLoad
106.5 dB
Common Mode Rejection
45 dB minimum, 10 Hz to 100 kHz
Preamplifier Output Clipping Level
-6 dBV (0.5 V)
Low Frequency Rolloff
Factory default: 6 dB per octave below 25 Hz
Alternate setting: 12 dB per octave below 95 Hz
MX1BP Dimensions (Figure 5 on page 12)
84.3 mm H x 65.2 mm W x 25.7 mm D (3.32" x 2.57" x 1.01")
MX1BP Net Weight:
255 g (9 oz.) with attached cabling
Cable
One 3.7 m (12 ft) 2 conductor shielded output cable with 3-pin male
XLR connector
Power Requirements
9 V alkaline battery (Duracell®MN1604 recommended); 8.4 V NiCd
rechargeable battery or 9 V Ultralife®lithium battery optional; or, with
phantom power, 10 V to 52 V dc.
Environmental Requirements
Operating Temperature Range: -18°C to 57°C (0°F to 135°F)
Relative Humidity: 0 to 95%
Battery Life (nominal)
600 continouscontinuous hours with 9 V alkaline battery
Battery Current (nominal)
0.8 mA
MX1BP Input Connector
Male 4-pin mini connector
FIGURE 3
PIN 2 = RED LEAD
PIN 1 = SHIELD (use only HALF
of the shield, solder the other half
to cable clamp)
PINS 3 and 4 = BLACK LEAD
(jumped)
4
3
1
2
FIGURE 4
Cartridge Type 1 kHz ref. 1 V per
microbar * 1 kHz ref. 1 V per Pascal **
Cardioid -66.547.5 dB
(.4734.22 mV)
-46.527.5 dB (4.732.2
mV)
Supercardioid -65.546.5 dB
(.5314.73 mV)
-26.545.5 dB
(5.3147.3 mV)
Omnidirectional -42.061.0 dB
(.8917.94 mV)
-41.022.0 dB
(8.9179.4 mV)

3
MX1BP Input Configuration
Unbalanced
MX1BP Output Connector
Male 3-pin XLR
MX1BP Output Configuration
Transformer-Balanced
Certification
Meets European Union EMC Emissions and Immunity Requirements
(EN 50081-1: 1992, EN 50082-1: 1992). Eligible to bear CE Marking.
Conforms to European EMC Directive 89/336/EEC. Meets applica-
ble tests and performance criteria in European Standard EN55103
(1996) parts 1 and 2, for residential (E1) and light industrial (E2) en-
vironments.
FURNISHED ACCESSORIES
Zipper Bag................................................................................ 26A14
Battery Powered Preamp ....................................................... MX1BP
OPTIONAL ACCESSORIES
Inline Preamplifier Kit (phantom power only) ......................RK183PK
REPLACEMENT PARTS
Omnidirectional Cartridge ....................................................... R183B
Supercardioid Cartridge ......................................................... R184B
Cardioid Cartridge ................................................................... R185B
Output Cable (MX1BP Preamplifier) ....................................95A2115
Belt Clip..............................................................................53A8247B
SHURE, the Shure logo, and MICROFLEX are registered trade-
marks of Shure Incorporated. DURACELL and ULTRALIFE are
registered trademarks of their respective owners.
MICROFLEX®SéRIE MX391BP
GUIDE DE L'UTILISATEUR
GÉNÉRALITÉS
Les Shure Microflex®série MX391 sont des petits microphones
électrostatiques à électrets à montage en surface conçus pour les
tables de conférence, planchers de scène et lutrins. Grâce à leur
haute sensibilité et vaste gamme de fréquences, ils sont particu-
lièrement indiqués pour le captage de la voix lors de l'amplification
en direct ou des enregistrements.
AVANTAGES
•Courbe de réponse plate dans toute la gamme vocale pour un
son non coloré
•Cartouches cardioïde, supercardioïde et omidirectionnelle
interchangeables permettant l'adaptation optimale à chaque
situation
•Extra-plat et profilé pour un aspect discret
•Sortie équilibrée sans transformateur pour une immunité au
bruit accrue avec de grandes longueurs de câble
•Le préamplificateur MX1BP est doté d'un commutateur
marche/coupure du microphone et d'un témoin d'alimentation
DEL ; il fonctionne soit sur une pile de 9 V soit sur alimentation
fantôme
VARIANTES
Les modèles MX391BP sont dotés d'un câble fixé de 3,7 mètres
avec connecteur miniature 4-broches et d'un préamplificateur sé-
paré. Le préamplificateur MX1BP comporte un câble intégré de
3,7 m terminé par un connecteur XLR mâle à 3 broches.
Les microphones périphériques Microflex®sont fournis avec l'une
de trois cartouches interchangeables, dont le type est indiqué par
le numéro de modèle (sur le dessous de la base du microphone).
Serie MX391BP/C. Configuration cardioïde pour la sonorisation
générale. Angle de captage (-3 dB) = 130°.
Serie MX391BP/S. Configuration supercardioïde pour les applica-
tions exigeant un captage étroit ou à plus grande distance. Angle
de captage (-3 dB) = 115°.
Serie MX391BP/O. Configuration omnidirectionnelle pour l'enreg-
istrement ou les applications de contrôle à distance. Angle de
captage = 360°.
INSTALLATION PERMANENTE
Des trous de vis dans la base du microphone et un trou de sortie
par le bas pour le câble sont prévus pour l'installation permanente
du microphone périphérique.
Pour acheminer le câble du microphone par le trou du bas,
procéder comme suit (Figure 1):
1. Retirer la grille de la base du microphone en desserrant la vis
unique du dessus.
2. Retirer le connecteur miniature 4-broches en coupant le câble
juste au-dessous du connecteur.
AVERTISSEMENT: Ne pas essayer de détacher le câble de l'in-
terface du microphone.
3. Réacheminer le câble (Figure 1).
4. Une fois le câble passé dans le trou de sortie par le bas de la
surface de montage, remonter le connecteur miniature 4-bro-
ches (Figure 4).