Audix M1255B Series User manual

M1255B
OVERVIEW:
The M1255B, a miniaturized condenser microphone with a fully integrated
preamp and detachable cable, is designed with a very high sensitivity for
distance miking. Applications include ceiling mount or table mount for
conferencing, overhead choir miking, location recording, audience or room
miking.
The M1255B has complete immunity from RF interference caused by cell
phones and GSM devices. The M1255B, which is equipped with a cardioid
capsule, is also available with hypercardioid, omni or shotgun capsules, giving
the microphone the unique ability to be used in a wide variety of live, studio and
broadcast applications.
The M1255B is available with a wide array of clips and accessories allowing
the microphone to be used for musical instruments, overhead stage miking,
podiums, conferences and presentations.
FEATURES:
Small, lightweight, low profile
Miniaturized integrated preamp circuitry
No external power adapter needed
12 mm gold vapor diaphragm
Immune to RF interference
Extremely low noise, high sensitivity
Available with a cardioid, hypercardioid, omni
or supercardioid capsule
APPLICATIONS:
Overhead mic for choir, group vocal
Acoustic instruments
Ambient room miking
Symphonic area miking
Speech / Presentation
Cymbals / Percussion
SUPPLIED ACCESSORIES:
25’ cable with mini-XLRf - XLRm connectors (CBL-M25)
Mic stand adapter (MC-MICRO)
Hanging clip (MC-HANGER)
External foam windscreen (WS1218)
Carrying pouch (P1)
OPTIONAL ACCESSORIES:
MICROBOOM - 50-inch carbon fiber boom arm with clutch assembly
SMT-MICRO - Stand adapter with rubber insulated shockmount
DCLAMP-MICRO - Lug mount adapted for hand percussion instruments with
shockmount ring
DVICE-MICRO - Drum rim mount attachment with shockmount ring
MC20i - Clamp on clip for Saxophone with shockmount ring
MGN-6 - 6-inch gooseneck with base terminating in standard XLRm
MGN-12 - Same as MGN-6 in 12 inch length
MGN-18 - Same as MGN-6 in 18 inch length
MODEL VARIATIONS:
M1255B-W - Same as above in white
M1255B-HC - Same as above with hypercardioid capsule
M1255BW-HC - Same as above with hypercardioid capsule in white
M1255B-O - Same as above with omni-directional capsule
M1255BW-O - Same as above with omni-directional capsule in white
M1255B-S - Same as above with supercardioid (shotgun) capsule
The Micros®Series
MINIATURE CONDENSER MICROPHONE
*with RFI immunity*
SMT-MICRO MC-HANGER MGN-18 (MICROPOD) MICROBOOM M1255W
M1255B

SPECIFICATIONS:
www.audixusa.com Call: 503-682-6933 Fax: [phone]
Audix Corporation 9400 SW Barber Street, Wilsonville, OR 97070
ARCHITECTS AND ENGINEERS SPECIFICATIONS:
The microphone shall be of the condenser type with a modular threaded capsule available in cardioid,
hypercardioid, omni-directional and supercardioid polar patterns. The microphone shall be protected
from RF interference. The microphone shall have a fully integrated preamp circuitry thereby eliminating
the need for a remote preamplier module. The microphone shall operate on 18 -52 Volts DC and the
nominal output impedance shall be equal to 150 ohms at 1 kHz. The microphone shall have a sensitivity
at of 32 mV / Pa at 1 kHz with a cardioid capsule. The microphone shall have a maximum SPL level of
≥130 dB with THD of 0.5% and the microphone shall be machined out of brass and the dimensions shall
be 12 mm in diameter by 54 mm in length. The microphone shall be the Audix M1255B.
OPERATION:
The M1255B is a low impedance microphone and should be plugged into a “mic level” input on your
console, mixer, or recording device. The M1255B requires phantom power and will NOT operate without
phantom power voltage (18-52 Volts) which is available on most professional mic preamps and mixing
devices. If phantom power is not available on your equipment, you will have to procure a phantom power
supply (such as the Audix APS2).
Avoid plugging or unplugging the microphone from a PA system unless the channel is muted or the
volume of the system turned down. Failure to do so may result in a loud “popping” noise which could
seriously damage the speakers in the PA system.
USER TIPS:
The M1255B is designed with extremely high sensitivity. This, in conjunction with very low noise
electronics, allows it to be used as a distance microphone. The M1255B is particularly effective in
situations where achieving the proper gain is a challenge, where either the mic mixer is limited in gain
or the sound is quiet or at a distance. The M1255B can be used for teleconferencing, either overhead or
on a table depending on the requirements of the installation. Other applications include podium, vocal
ensembles, choir, and acoustic instruments.
Polar patterns: The M1255B is offered in 4 different polar patterns to help you achieve optimum
results.
Cardioid (M1255B): In general, the cardioid pattern is the most widely used as it offers a good balance
between the sound of the instrument or voice within the context of the room or venue. The cardioid
pattern is also helpful with resistance to feedback. For acoustic instruments, in general, the working
range will depend on the sound pressure levels produced by the instrument. Because of its small
size, the M1255B could also be used in hard to reach areas, such as beneath cymbals. For orchestral
instruments, the M1255B may be positioned anywhere from 3 - 12 inches depending on instrument and
room acoustics. For speech or singe voice the typical working distance is 8 - 10 inches. For area miking
or group vocals the working distance can be between 2 - 6 feet from the sound source (see ADX40 and
MB1250B for choir miking).
Hypercardioid (M1255B-HC): In situations where the volume is loud on stage or there are many
open microphones, this pattern is helpful in further isolating the instrument or vocal from the rest of the
instruments on stage. The microphone can be worked at ½ the distance of cardioid if necessary.
Supercardioid (M1255B-S): This polar pattern, also known as a shotgun pick up pattern, has a longer
reach and more narrow pattern than the other cardioid patterns. This pattern is a preference at time for
podium applications. It is helpful in pin-pointing hard to reach areas, especially for recording outdoors
and with video.
Omni-Directional (M1255B-O): This pattern picks up from all directions, offering very little in the
way of isolation or feedback control. However, the omni pattern offers the most accurate and natural
sound reproduction of all the patterns. It is ideal for recording, live broadcasts or video where sound
reinforcement speakers are not an issue.
*Further miking techniques may be found on our website at www.audixusa.com
SERVICE AND WARRANTY:
This microphone is under warranty for
a period of 3 years from any and all
manufacturing defects. Should your
microphone fail in any way, please
contact theAudix Service department at
503-682-6933. A Return Authorization
number is required before returning
any products.
CARE AND MAINTENANCE:
The M1255B is manufactured to exacting
specs with roadworthy construction. However,
the capsule is highly sensitive and should be
handled with care. Avoid extreme temperatures
and be sure to store your microphone in the
pouch provided when not in use. Moisture of
any kind can adversely affect the sound and
performance of your microphone.
***All specications subject to change without notice.
To register your
microphone, please visit
www.audixusa.com
Transducer Type Condenser
Frequency Response 50 Hz - 19 kHz
Polar Pattern Cardioid
Hypercardioid
Omni
Supercardioid
Output Impedance 150 ohms
Sensitivity 32 mV / Pa @ 1k
Signal/Noise Ratio (A-weighted) 73 dB
Equivalent Noise Level (A-weighted) 21 dB
Maximum SPL @ .5% THD ≥130 dB
Dynamic Range 109 dB
Power Requirements 18 – 52 V
Connector 3 pin mini-XLRm
Polarity Positive pressure on
diaphragm produces
positive voltage on pin
2 relative to pin 3
Housing / Finish Machined brass /
Powder coat
Weight 20 g / 0.7 ounces
Length 54 mm / 2.1 inches
FREQUENCY/POLARS: DIMENSIONS (mm):
M1255B
Cardioid Hypercardioid Omni