Earthworks
Earthworks M30 Measurement Mic
Best precision tool for professional audio engineers and system tuners.
This lab-grade measurement microphone is engineered for serious sound analysis, offering unparalleled accuracy across a wide frequency range from 3Hz to 30kHz. Its exceptionally consistent omnidirectional polar response ensures reliable data capture in any setting. With a high 140dB SPL rating, it handles intense sound pressure levels without distortion and is immune to environmental fluctuations, making it ideal for demanding applications like PA system alignment and loudspeaker design. It seamlessly integrates with major audio measurement software for precise results.
$699.00
Owner Satisfaction
4.7
/ 5
Category Rank
274
/ 3367
#274 in Microphones
Price vs Category Average
+38%
Above average
Frequency Response
330
/ Hz - kHz
Who it's for
- Touring professionals requiring rugged gear that survives demanding daily use
- Acoustic engineers needing precise, reliable data for critical room analysis
- Sound technicians capturing high-SPL sources with extreme dynamic clarity
Who should skip it
- Budget-conscious hobbyists looking for an affordable entry-level measurement tool
- Musicians seeking a versatile microphone for vocal or instrument recording
- Field recordists using mobile setups without reliable phantom power access
Performance breakdown
Frequency Accuracy
Flat response from 3Hz to 30kHz ensures absolute measurement precision.
SPL Handling
Captures high-decibel sources without distortion or signal clipping.
Environmental Stability
Reliable performance across extreme temperature and humidity fluctuations.
Polar Consistency
Omnidirectional pattern remains uniform for accurate spatial sound analysis.
Software Compatibility
Seamless integration with industry-standard FFT-based measurement platforms.
Build Quality
Lab-grade construction designed for rigorous, long-term professional field use.
Key Specs
Frequency Response
3Hz - 30kHz
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
Know before you buy
Yes. The M30 is designed to be immune to most temperature and atmospheric fluctuations, allowing it to perform reliably in a wide range of environments from -20°C to 60°C.
Yes, every M30 is individually hand-tuned and tested. You receive a printed frequency response chart in the box, and you can download an Electronic Calibration File (ECF) for use with software like SMAART or Spectrafoo.
Absolutely. The M30 is rated for a maximum acoustic input of 140dB SPL, making it capable of capturing very loud sound sources without introducing distortion.
The M30 requires standard 24V to 48V phantom power to operate. As long as your audio interface or preamp provides this, it will function correctly.
Unlike standard studio microphones, the M30 is a lab-grade measurement tool with a flat 3Hz to 30kHz frequency response and a strictly consistent omnidirectional polar pattern. It is engineered specifically for accuracy in system alignment and loudspeaker design rather than musical coloration.
The M30 is built to be robust and exhibits no handling noise, but it should be treated with the care afforded to any precision measurement instrument. Keeping it within its specified storage temperature range and avoiding physical impact will ensure its long-term calibration accuracy.
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