MX300
Boundary
Microphones
Shure Microflex
MX300 Series microphones are
®
surface-mounted electret condenser microphones
designed primarily for mounting on conference ta-
bles, stage floors, and lecterns. Their high sensi-
tivity and wide frequency range make them espe-
cially 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 eas-
ily 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 suf-
ficiently 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 indi-
cated by a model number suffix:
/C Cardioid
/S Supercardioid
/O Omnidirectional
Interchangeable Cartridges
Remove Grille
Remove Bracket
Microflex microphones use interchangeable car-
tridges that allow you to choose the polar pattern
for different installations.
/O (R183)
/C (R185)
R183 Omnidirectional
R185 Cardioid
/S (R184)
R184
Supercardioid
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,
Cartridge
(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.
3