Earthworks M30 User Manual

Electronic Calibration Files

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M30

Measurement Microphone

User’s Guide

Service & Repair

If you have any problems with your Earthworks
products, please contact our Service & Repair
Department.

Email: [e-mail]

Telephone: [phone], ext. 119

Printed in USA

MADE IN USA • 15 YEAR WARRANTY

earthworksaudio.com

M30

Description

The Earthworks M30 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 M30 requires a standard 48V phan­tom power supply. It features a linear free-eld fre­quency response from 5Hz to 30kHz (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 M30 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 registering your new
microphone. A mounting clip and a calibrator adapter
are included with the microphone.

Applications

The Earthworks M30 is ideally suited for measurements
including loudspeaker design and quality control, sound
system setup and troubleshooting, room acoustics,

or any application where an accurate free-eld mea-

surement microphone is required. Many test systems
manufacturers, such as EAW Smaart™ and DEQX™, are
recommending M30 microphones. The wide linear min-

imum-phase response and fast well-damped impulse
response make the M30 an excellent microphone for

loudspeaker design, especially for time domain mea­surements.

The M30 is simple to operate. Connect the microphone

to a microphone preamplier supplying 24-48V phan-

tom 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 M30
toward the sound source.

This microphone has no removable parts.

Calibration

The microphone is calibrated at the factory at 1 kHz (in-

dependent of any frequency weighting). The sensitivity

in mV/Pa is provided on the enclosed calibration chart.
If on-site calibration is required, use the enclosed one-

half inch standard calibration adapter.

Specications

Frequency response: 5Hz to 30kHz +1/-3dB

Polar Pattern: Omnidirectional

Sensitivity: 36mV/Pa (Typical)
Power Requirements: 24-48V Phantom, 10mA
Peak Acoustic Input: 140dB SPL
Output: XLR-3
Minimum Load: 600Ω btw. pins 2 & 3
Noise: 20dB, A equivalent
Dimensions L x D: 229 x 22 mm (9 x .860 in.)
Weight: 225g (.5lb)

Specications are subject to change without notice.

Pin 1

“Shield”

Pin 3
“-”

XLR Output Connector Assignment of M30

Frequency Response of M30 (typical)

Impulse Response of M30 (typical)

Pin 2

“+”

NOTE: Earthworks recommends re-calibration every ve

(5) years.

Polar Response of M30 (typical)