Description

When you need trustworthy numbers, not just a decent-sounding mic, the Earthworks M23 earns its place in the M Series lineup as the go-to choice for affordable, dependable measurement work. It’s engineered to stay accurate through temperature swings and shifting atmospheric conditions, with a fast impulse response that captures transients cleanly and a wideband frequency reach that doesn’t waver.

Flat frequency response to 23kHz (9Hz–23kHz, ±1/-3dB)
Omnidirectional polar pattern with tight, consistent polar characteristics
Successor to the SMAARTMIC previously sold by EAW
Suited to acoustical measurement, sound system alignment, troubleshooting, and room acoustics analysis
Compatible with SMAART, MLSSA, Spectrafoo, TEF, RTA, and acoustic measurement platforms from dbx, DEQX, and others
Meets or exceeds ANSI Type 1 and applicable IEC 61094 standards
Requires 48V phantom power

Every M23 ships with its own individual calibration chart, showing measured open-circuit sensitivity and frequency response curve — no guessing, no generic averages. An electronic calibration file is also available. Sensitivity runs at 30mV/Pa (-30.5dBV/Pa), max acoustic input hits 142dB SPL, and self-noise is a low 22dB SPL equivalent (A-weighted). Output is via balanced XLR at 100Ω impedance, with a minimum load of 600Ω between pins 2 and 3.

Built compact and light at 165mm x 22mm and just 160g, the M23 operates reliably from -10°C to +40°C and stores safely between -20°C and +50°C. Earthworks recommends re-calibration every five years to keep readings trustworthy over the long haul.