Earthworks M50 User Manual

M50

Premium High Definition Measurement Microphone™

• Premium Measurement Microphone

• 50kHz Free-Field Frequency Response

• Meets or Exceeds Type 1 Specications

• 140dB SPL Max Acoustic Input

• Used by Research Laboratories and
Acousticians Throughout the World

• 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

Polar
Response

Impulse Response

• Electronic Calibration Files are Avail­ able online after completing product
registration at no cost

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:

Temp. Operating Range:

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: sales@earthwork­saudio.com

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

3Hz to 50kHz ± 1/-3dB
Omnidirectional
36mV/Pa (Typical)
48V Phantom, 10mA
140dB SPL

Output:

XLR-3 (pin 2+)
600 ohms between pins 2 & 3

Noise:

20dB SPL (A weighted)

-4˚ to 140˚F (-20˚ to +60˚C)
9 x .860 in. (229 x 22 mm)

Weight:

0.5 lb. (227g)

sponse, 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, Acousticians, as well as Industrial and

Research Laboratories throughout the world have
sought after the extremely wide frequency range of

the Earthworks M50. In addition, they have great

respect for the near-perfect polar response of this
microphone. The M50 provides a frequency re-

sponse from 3Hz to 50kHz, and will handle 140dB
SPL. For those looking for a premium “top of the

line” measurement microphone designed to exact-

ing standards, the Earthworks M50 is it.

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 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 M50 comes in a protective carton with a cus­tom 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 M50 re-

quires standard 48V phantom power for operation.

The M50 is the perfect choice for those who desire
the utmost in precision, the widest in frequency re­sponse and superb polar response in an expertly
manufactured precision measurement micro­phone. The M50 can be used in a wide variety of envi­ronments and will withstand the rigors of the road due
to its robust design. The M50 is used in every critical
environment from the most elegant of research labo­ratories to the recording of animal and bird sounds
deep in the African jungle.