Omni Measurement Microphones 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 and engineers have requested a high
quality, lower cost version of our popular M30. The
M23 is our answer to this request. The M23 pro-
vides a frequency response from 3Hz to 23kHz,
and will handle 140dB SPL. In comparison, the
M30 offers a frequency response from 3Hz to
30kHz. The M23 also has a shorter body length
than the M30. For those who are looking for a low-
er cost alternative to our popular M30, the M23 is
it. The M23 is a direct replacement for the Earth-
works manufactured model S30 SMAART™ micro-
phone offered by Loud Technologies, Inc.
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
phantom power standard). 10mA of current is re-
• ImprovedVersionoftheMeasurement
MicrophoneManufacturedforLoud
TechnologiesSMAART™System
• MeetsorExceedsType1andapplicable
IEC61094requirements
• 23kHz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
Polar
Response
Impulse Response
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 M23 comes in a protective carton with a cus-
tom die-cut foam insert and its own individual cali-
bration chart. For those who desire electronic cali-
bration 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 M23 requires standard 24-48V phantom pow-
er for operation.
The M23 is the ideal choice for those who desire a
high-quality reliable measurement microphone for
room measurements and sound system setup. The
M23 will provide the same excellent polar accuracy
as our higher-priced measurement microphones.
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 23kHz ± 1/-3dB
Omni
34mV/Pa
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)
6.25 x .860 in. (165 x 22 mm)
0.35 lb. (1.60kg)
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
M23
HighDefinitionMeasurementMicrophone™
Frequency Response