Description

If you’re setting up sound systems, tuning rooms, or checking loudspeaker performance, you need a microphone that tells the truth — not one that flatters or colors what it hears. The Earthworks M-30 is built for exactly that job. This listing is for a demo unit, giving you access to Earthworks’ respected M Series measurement mic at a reduced cost.

The M-30 delivers a flat, wideband frequency response with an exceptionally fast impulse response, so transients and detail come through cleanly rather than smeared. It’s stable across temperature and atmospheric shifts, which matters when you’re taking readings in the field or in a live venue that isn’t climate-controlled. The omnidirectional polar pattern makes it a natural fit for free-field acoustic measurement work.

Condenser transducer, omnidirectional pattern
Frequency response: ±1dB from 9Hz–27kHz, +1/-3dB from 5Hz–30kHz
Signal-to-noise ratio: 27dB SPL equivalent (A-weighted)
Maximum input SPL: 150dB
Requires 48V phantom power, draws 10mA
600 ohm output impedance, balanced transformerless XLR output
Meets or exceeds ANSI Type 1 and IEC 61094 standards
Dimensions: 9″ x 0.860″ (229mm x 22mm); Weight: 0.5 lb (225g)

It’s a favorite behind the scenes of measurement platforms like SMAART, MLSSA, Spectrafoo, TEF, and RTA, as well as systems from dbx and DEQX. Each M-30 ships with its own individual calibration chart showing open-circuit sensitivity and frequency response — so what you see on paper is what you get in the room.

Whether you’re doing loudspeaker QC, troubleshooting a PA, or characterizing room acoustics, the M-30 gives you measurement-grade accuracy without the enterprise price tag.