Earthworks M23 User manual

Technical Support

Should you have any questions regarding
your M23 microphone please contact us:

e-mail: Support@ear thworksaudio.com
phone: [phone], ext. 19
(9am – 5pm ET)

For warranty and product return/exchange
information please refer to the back of the
enclosed Calibration Chart.

FIFTEEN-YEAR WARRANTY
All Earthworks products (excluding acces­sories) carry a fteen-year limited warranty
(parts and labor). If you have any problems
with your Earthworks products, please con­tact our warranty/repair department by email
at: [e-mail] or by tele­phone at [phone], Ext. 19.

Electronic Calibration Files

Electronic Calibration les are available for
your individual microphone, should you
need to calibrate your specic microphone
to your measurement software or system.
To obtain an electronic calibration le for
your microphone call 603-654-6427, ext

14. You will need to provide your micro­phone model and serial number. The cost
is $50 which can be paid with a credit card.
Once purchased, the electronic calibration
le will be sent to you via email as an at­tachment. If you have any questions, please
call the above listed phone number or email:
[e-mail]

Earthworks, Inc.

37 Wilton Rd.

Milford, NH 03055 USA

Phone: [phone]

Fax: [phone]

earthworksaudio.com

Made in U.S.A.

Printed in U.S.A.

Description

Earthworks M23 is an omnidirectional
(pressure) microphone designed and cal­ibrated for measurement purposes. It is
a pre-polarized condenser microphone
directly coupled to a wideband, low out­put impedance preamplier. The M23
requires a standard 48V phantom power
supply. It features a linear free-eld fre­quency response from 9Hz to 23kHz
(please see the enclosed individual cali­bration chart), very low handling noise,
uniform polar pattern, and very high SPL
handling capabilities. Its unique circuitry
excludes the transconductance of the in­put FET from the overall gain structure.
This means the sensitivity remains very
stable when the microphone is subject­ed to variations in ambient temperature.
The M23 meets or exceeds ANSI Type 1
requirements.

Each microphone is delivered with its
own calibration chart providing its indi­vidually measured open-circuit sensitiv­ity and the frequency response curve. A
computer le containing the frequency
response data for importing directly into
measurement software is available from
Earthworks, Inc. upon request at an ex­tra cost. A mounting clip and a calibra­tor adapter are included with the micro­phone.

Applications

Earthworks M23 is ideally suited for
acoustical measurements sound sys­tem setup and troubleshooting, room
acoustics, or any application where an
accurate free-eld measurement mic
rophone is required. The wide linear
minimum-phase response and fast well­damped impulse response (Fig. 2) make

Version 4, July 7, 2011

the M23 an excellent microphone for
room acoustics measurements, especial­ly for time domain measurements.
The M23 is simple to operate. Connect
the microphone to a microphone preampli­er supplying 48V phantom power using a
standard XLR microphone cable. Please al­low up to one minute for the microphone
to settle. Plugging in the microphone “hot”
(phantom power already present at the in­put) will not damage the microphone, and
is actually preferred for faster settling. For
optimum results we recommend pointing
the M23 toward the sound source.

This microphone has no removable parts.

Calibration

The microphone is calibrated at the
factory at 1 kHz (therefore independent of
any frequency weighting). The sensitivity
in mV/Pa is provided on the calibration
chart. If on-site calibration is required, use
the enclosed one half inch standard calibra­tion adapter.

Specications

Frequency response: 9Hz to 23kHz +1/-3dB

Polar Pattern: Omnidirectional

Sensitivity: 30mV/Pa (Typical)

Power Requirements: 48V Phantom, 10mA

Peak Acoustic Input: 142dB SPL

Output: XLR-3 (Fig. 1)

Minimum Load: 600Ω btw. pins 2 & 3

Noise: 22dB, A equivalent

Dimensions L x D: 165 x 22 mm,
(6.5 x .860 in.)

Weight: 160g (.3lb)

Compliant

Specications are subject to change without notice.

Fig 1. XLR Output Connector Assignment of M23

Fig 2. Impulse Response (Typical) of M23

Fig 3. Polar Response (Typical) of M23