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.
The M30 is one of the most respected, accurate
and reliable measurement microphones on the
market. Consultants and Acousticians throughout
the world rely on the M30 in performing their mea-
surements and acoustical analysis. In addition,
they have great respect for the near-perfect polar
response of this microphone. The M30 provides an
impressive frequency response of 3Hz to 30kHz,
near-perfect polar response and it will handle
140dB SPL. For those looking for an extremely ac-
curate and reliable measurement microphone, the
Earthworks M30 is it.
The Earthworks line of measurement microphones
(with exception to the M30BX, which is battery oper-
ated) require standard 24-48V phantom power and
up to 10mA of current (which is within the industry
• OneoftheIndustry’sMostPopular
MeasurementMicrophones
• MeetsorExceedsType1andapplicable
IEC61094requirements
• 30kHz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
phantom power standard). 10mA of current is re-
quired to supply our high current, bipolar Class A
amplier within the microphone that is made with
all discrete components, with no capacitors in the
signal path providing excellent phase response.
This also allows the microphone(s) to feed long
signal lines up to 300 feet (91m) and maintain the
full frequency response of the microphone at the
other end of the line, without any loss in high fre-
quencies.
The M30 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 M30 re-
quires standard 24-48V phantom power for opera-
tion.
The M30 is robust and can be used in a wide vari-
ety of environments from the most elegant of re-
search laboratories to making measurements in the
outdoors and tropics. In making acoustic measure-
ments, the M30 will be your most trusted, accurate
and reliable measurement instrument.
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 30kHz ± 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)
M30
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