Earthworks M23R Reference Measurement Microphone

The M23R is a precision engineered 23kHz 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. Every M23R has the same frequency response and sensitivity - matched to within +/- 0.5dB across the entire operating frequency range (3Hz to 23kHz). Build your own matched array of reference microphones at your own speed. Simply add more M23Rs whenever you need them. They’ll match tomorrow or ten years from now.

Technical Specifications

FREQUENCY RESPONSE
3Hz -23kHz ±0.5dB
POLAR PATTERN
Omnidirectional
SENSITIVITY
36mV/Pa (-28.9dBV/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)
OPERATING TEMPERATURE RANGE
-4º to 140º F (-20º to +60º C)
STORAGE TEMPERATURE RANGE
-40º to 176º F (-40 to +80º C)
HUMIDITY
Up to 90%
DIMENSIONS (L x D)
165mm x 22mm (6.25 x .860 inches)
WEIGHT
.5 lb. (225g)