Earthworks M30
Earthworks M30 Earthworks M30

Earthworks M30 Measurement Microphone


Hyper accurate. Reliable results. Every single time.


The M30 is an affordable, reliable 30 kHz reference microphone. It utilizes a very small, very accurate omnidirectional element, a carefully crafted stainless steel body, and innovative circuitry to deliver flat, time coherent response from 9 Hz to 30 kHz. The M30 has become the defacto standard reference for Smaart, MLSSA, SIMM and TEF. The M30 is the most cost-effective measurement microphone which you can trust. It exceeds the specified requirements for al audio band measurement systems.



The measurement mic if you’re serious about sound.


The M30 is a standard.The M30 comes with a measured frequency response chart which includes a value for sensitivity. Since the M30 is stable with respect to temperature, you can input this number if your program allows and be very close to correct absolute SPL. We also ship the M30 with a ‘white’ calibrator adapter which adapts from the M30 to a 1/2-inch calibrator adapter for field calibration.The M30 is available as amatched pair and doubles as a great sounding recording microphone. It is sturdy and reliable. The M30 is a sound investment.


Accuracy, consistency, and reliability have made the Earthworks M30 measurement microphone the first choice of live sound professionals, acousticians, and researchers all over the world. Used on countless full-scale concert tours, as well as in scientific research laboratories, tropical rainforests, and rocket testing facilities, the M30 and its M-Series siblings have proven to be lab-grade audio instruments that can handle any environment.


Few microphones have the reputation for quality and durability that the SM57 has built up since it first hit the market in 1965. Since then, this product has been an industry benchmark to which all other studio microphones have been compared. It can be seen anywhere, from small clubs to sports stadiums, and has been used in the studio by many of the world’s greatest musicians. The Shure SM57 is also the microphone of choice for the White House, providing voice projection for the President since the 1970s.


The M30 is a precision engineered 30kHz omnidirectional measurement microphone ideally suited for acoustical measurements including loudspeaker design and quality control, sound system setup and troubleshooting, room acoustics, or any application where an accurate free-field measurement microphone is required.


The M30’s audio performance is unparalleled. It has a flat frequency response that extends from 3Hz to 30kHz, an exceptionally consistent omnidirectional polar response, 140dB SPL rating without distortion and no handling noise. With temperature compensated electronics, the M30 was built to deliver repeatable results no matter what the environment.


Extremely fast impulse response and linear phase response make the M30 ideal for use with high-quality FFT-based real-time audio system measurement software like SMAART™, SIM™, REW™, Electroacoustics Toolbox™, FuzzMeasure™ and others, as well as for use in PA system alignment and loudspeaker design.


Every M30 is individually hand-tuned and tested and is delivered with its own printed frequency response chart. An Electronic Calibration File (ECF) is generated for each microphone during final testing, and can be downloaded free of charge after product registration.


Frequency Response 3Hz -30kHz ±1/-3dB
Polar Pattern Omnidirectional
Sensitivity 34mV/Pa (-29dBV/Pa)
Power Requirements 24-48V Phantom, 10mA
Max Acoustic Input 140dB SPL
Output XLR (pin 2+)
Output Impedance 65Ω balanced (between pins 2 & 3)
Min Output Load 600Ω between pins 2 & 3
Noise 20dB SPL equivalent (A weighted)
Dimensions (L x D) 229mm x 22mm (9 x .860 inches)
Weight .5 lb. (225g)