M23
High Definition Measurement Microphone™
• Improved Version of the Measurement
Microphone Manufactured for Loud
Technologies SMAART™ System
• Meets or Exceeds Type 1 Specications
• 23kHz Free-Field Frequency Response
• 140dB SPL Max Acoustic Input
• Shorter Body Than the M30
• Ideal for SMAART™, MLSSA™,
Spectrafoo™, TEF™, RTA and all
“Audio Band” Measurements
• Requires 48V Phantom Power
• Multiple Measurement Microphones
can be matched for a nominal fee
• Electronic Calibration Files are avail able online after completing product
registration at no cost
Polar
Response
Impulse Response
Frequency Response
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 exceptionally uniform polar response. They feature
at free-eld frequency response, fast impulse re-
SPECIFICATIONS
Frequency Response:
Polar Pattern:
Sensitivity:
Power Requirements:
Max Acoustic Input:
Min. Output Load:
Dimensions L x D:
ELECTRONIC CALIBRATION FILES
Electronic Calibration les are available for all models of Earthworks measurement microphones, so
your specic 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:
Earthworks, Inc. • 37 Wilton Rd. • Milford, NH 03055 • Phone: (603) 654-2433, ext 114 • email: sales@earthworksaudio.com • earthworksaudio.com
9Hz to 23kHz ± 1/-3dB
Omni
36mV/Pa (-29dBV/Pa)
48V Phantom, 10mA
140dB SPL
Output:
XLR-3 (pin 2+)
600 ohms between
pins 2 & 3
Noise:
20dB SPL (A weighted)
6.25 x .860 in. (165 x 22 mm)
Weight:
0.35 lb. (1.60kg)
sponse, and are remarkably stable with respect to
temperature changes, meeting or exceeding Type 1
specications. Our M Series measurement microphones 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 provides a frequency response from 9Hz to 23kHz,
and will handle 140dB SPL. In comparison, the
M30 offers a frequency response from 5Hz to
30kHz. The M23 also has a shorter body length
than the M30. For those who are looking for a lower cost alternative to our popular M30, the M23 is
it. The M23 is a direct replacement for the Earthworks 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 operated) require standard 48V phantom power and
up to 10mA of current (which is within the industry
phantom power standard). 10mA of current is re-
quired to supply our high current, bipolar Class A
amplier 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 frequencies.
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 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 M23 requires standard 48V phantom power
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.