Earthworks M23R

The Earthworks M23R is a 23kHz omnidirectional measurement microphone with a frequency response of 3Hz to 23kHz ±0.5dB, designed for critical acoustic measurement applications.

Precision Matching

Each M23R maintains identical frequency response and sensitivity within ±0.5dB, ensuring true uniformity across every unit produced. This allows engineers to expand microphone arrays over time without introducing variations, guaranteeing reliable results whether using one microphone today or an array years later.

Flexibility in Arrays

The uniform design means users can build arrays of reference microphones at any pace. Additional microphones integrate seamlessly, matching with the same exacting tolerance, which makes the system scalable for evolving projects or teams.

Time and Space Consistency

Because every M23R maintains the same response, results remain consistent across locations and over time. Multi-microphone measurements and distributed teams achieve the same accuracy without calibration issues.

Professional Audio Resolution

The microphone captures the fine detail of initial transients with extreme accuracy. These fast transient responses define timbre, texture, and perceived “air”, elements essential for loudspeaker design, room analysis, and high-resolution system setup. Earthworks’ technology ensures audio measurements that translate directly to natural sound reproduction.

Technical Specifications

The M23R offers an omnidirectional polar pattern, 36mV/Pa sensitivity, and requires 24-48V phantom power at 10mA. It handles a maximum acoustic input of 140dB SPL, with an output via balanced XLR and a 65Ω output impedance, driving a minimum 600Ω load. Self-noise is equivalent to 20dB SPL (A-weighted). The unit operates in temperatures from -20°C to +60°C and withstands storage from -40°C to +80°C, with up to 90% humidity. Dimensions measure 165mm in length and 22mm in diameter, weighing 160g.