Earthworks M23MP Specifications

M23

High Definition Measurement Microphone™

• Improved Version of the Measurement
Microphone Manufactured for Loud

Technologies SMAART™ System

• Meets or Exceeds Type 1 Specications

• 23kHz Free-Field Frequency Response

• 142dB 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 on-line after completing product
registration at no cost.

M23

Polar
Response

M23

Impulse Response

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 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: [e-mail]

9Hz to 23kHz ± 1/-3dB
Omni
30mV/Pa (-30.5dBV/Pa)
48V Phantom, 10mA
142dB SPL

Output:

XLR-3 (pin 2+)

600 ohms between
pins 2 & 3

Noise:

22dB SPL (A weighted)

6.25 x .860 in. (165 x 22 mm)

Weight:

0.35 lb. (1.60kg)

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 response, and are remarkably sta­ble with respect to temperature changes, meet­ing or exceeding Type 1 specications. 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 142dB SPL. In compari­son, the M30 oers 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™ microphone oered by Loud Tech­nologies, Inc.

The Earthworks line of measurement micro-

phones (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 required 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 frequencies.

The M23 comes in a protective carton with a
custom die-cut foam insert and its own indi-

vidual calibration 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.

Expertly Hand Made in the U.S.A.

Earthworks, Inc. • 37 Wilton Rd. • Milford, NH 03055 • Phone: [phone], ext 114 • email: [e-mail] • earthworksaudio.com

8/6/2013