Earthworks M30BX Datasheet

M30BX

Battery Powered High Definition Measurement Microphone™

• Battery Powered Measurement
Microphone

• Meets or Exceeds Type 1 and applicable

IEC 61094 requirements

• 30kHz 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

Polar
Response

• Powers “on” or “off” when the XLR

Impulse Response

connector is inserted or removed to
preserve battery life

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 re­sponse, and are remarkably stable with respect to
temperature changes, meeting or exceeding Type 1
specications. Our M Series measurement micro-

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

9Hz to 30kHz ± 1/-3dB
Omnidirectional
34mV/Pa (Typical)
6V battery, type P28
(2CR-1/N or equivalent)
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)
910 x .865 in. (220 x 23 mm)

Weight:

0.4 lb. (180g)

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.

The M30BX is a highly accurate and reliable bat-

tery powered measurement microphone. Consul­tants and Acousticians throughout the world rely

on the M30BX for performing their measurements

and acoustical analysis in areas where there is

no available AC power. The M30BX provides an
impressive frequency response of 9Hz to 30kHz,

near-perfect polar response and it will handle up

to 140dB SPL. For those looking for an extremely

accurate and reliable measurement microphone

for eld measurement purposes, the Earthworks
M30BX is it.

The M30BX comes with an XLR to RCA adapter to
facilitate connecting the M30BX to a sound card

on your mobile computing device. There is also a
small plunger inside the XLR connector that oper­ates an internal battery “on/off” switch that will
help preserve battery life. So there is no need for

a power “on/off” switch. Just plug in an XLR or

the XLR to RCA adapter and the M30BX “powers
on.” Remove the XLR connector or adapter and the
M30BX powers off.

The Earthworks line of measurement microphones

utilizes high current, bipolar Class A amplier with­in the microphone, which are made with all dis­crete components, with no capacitors in the signal

path providing the microphone’s 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 micro-

phone at the other end of the line, without loss of

high frequencies.

The M30BX comes in a protective carton with a

custom die-cut foam insert and its own individual

calibration chart. For those who desire calibration
les to interface with their software, these are
available at no cost. In addition, any number of mi-

crophones can be matched for a nominal fee.

The M30BX is robust and can be used in a wide

variety of outdoor environments from a football

stadium to the tropics. When making acoustic
measurements in the outdoors, or in areas where
there is no AC power available, the M30BX will be
your most trusted, accurate and reliable measure-

ment instrument.