Data Sheet

Earthworks M Series measurement microphones
have become the accepted standard for reliable
measurement and reference. They are accurate
in the time and frequency domain and have ex-
ceptionally uniform polar response. They feature
at free-eld frequency response, fast impulse re-
sponse, and are remarkably stable with respect to
temperature changes, meeting or exceeding Type 1
specications. Our M Series measurement micro-
phones are used and recommended by SMAART™,
MLSSA™, Spectrafoo™, TEF™, RTA in addition to
acoustic measurement systems manufactured by
dbx, Rational Acoustics, DEQX and others.
Consultants, Acousticians, as well as Industrial and
Research Laboratories throughout the world have
sought after the extremely wide frequency range of
the Earthworks M50. In addition, they have great
respect for the near-perfect polar response of this
microphone. The M50 provides a frequency re-
sponse from 3Hz to 50kHz, and will handle 140dB
SPL. For those looking for a premium “top of the
line” measurement microphone designed to exact-
ing standards, the Earthworks M50 is it.
The Earthworks line of measurement microphones
(with exception to the M30BX, which is battery op-
erated) require standard 24-48V phantom power
and up to 10mA of current (which is within the in-
dustry phantom power standard). 10mA of current
is required to supply our high current, bipolar Class
A amplier within the microphone that is made
• PremiumMeasurementMicrophone
• MeetsorExceedsType1andapplicable
IEC61094requirements
• 50kHzFree-FieldFrequencyResponse
• 140dBSPLMaxAcousticInput
• Omnidirectionalpolarpattern
• IdealforSMAART™,MLSSA™,Spec-
trafoo™,TEF™,RTAandall“Audio
Band”Measurements
• Requires24-48VPhantomPower
• OperatingTempRange:-20degCto
+60degC(-4deg.Fto140deg.F)
• StorageTempRange:-40degCto
+80degC(-40deg.Fto176deg.F)
• Humidity:Upto90%
Earthworks, Inc. • 37 Wilton Rd. • Milford, NH 03055 • Phone: [phone], ext 114 • email: [e-mail] • earthworksaudio.com
with all discrete components, with no capacitors
in the signal path providing excellent phase re-
sponse. This also allows the microphone(s) to feed
long signal lines up to 300 feet (91m) and main-
tain the full frequency response of the microphone
at the other end of the line, without any loss in high
frequencies.
The M50 comes in a protective carton with a cus-
tom die-cut foam insert and its own individual cali-
bration chart. For those who desire calibration les
to interface with their software, these are available
at no cost. In addition, any number of microphones
can be matched for a nominal fee. The M50 re-
quires standard 24-48V phantom power for opera-
tion.
The M50 is the perfect choice for those who desire
the utmost in precision, the widest in frequency re-
sponse and superb polar response in an expertly
manufactured precision measurement micro-
phone. The M50 can be used in a wide variety of envi-
ronments and will withstand the rigors of the road due
to its robust design. The M50 is used in every critical
environment from the most elegant of research labo-
ratories to the recording of animal and bird sounds
deep in the African jungle.
SPECIFICATIONS
Frequency Response:
Polar Pattern:
Sensitivity:
Power Requirements:
Max Acoustic Input:
Output:
Min. Output Load:
Noise:
Temp. Operating Range:
Dimensions L x D:
Weight:
3Hz to 50kHz ± 1/-3dB
Omnidirectional
34mV/Pa (Typical)
24-48V Phantom, 10mA
140dB SPL
XLR-3 (pin 2+)
600 ohms between pins 2 & 3
20dB SPL (A weighted)
-4˚ to 140˚F (-20˚ to +60˚C)
9 x .860 in. (229 x 22 mm)
0.5 lb. (227g)
M50
PremiumHighDefinitionMeasurementMicrophone™
Electronic Calibration les are available for all
models of Earthworks measurement microphones,
so your specic microphone can be calibrated to your
measurement software or system. For you to obtain
your electronic calibration les (ECF), you must rst
register your microphone online at earthworksaudio.
com/register and afterwards go to earthworksaudio.
com/ecf to request your ECF le, which will be sent to
you as an email attachment. If you have any questions,
please call 603-654-2433, ext 114 or email: sales@
earthworksaudio.com
ELECTRONIC CALIBRATION FILES
Polar
Response
Impulse Response
Frequency Response