Earthworks M23 23kHz Measurement Microphone – Refurbished

Earthworks M23 23kHz Measurement Microphone – Refurbished


The Earthworks M23 Omnidirectional Small-Diaphragm Condenser Microphone has a ruler-flat frequency response to 23kHz (hence the name) and is ideal for room acoustics analysis and correction, sound system calibration and troubleshooting, loudspeaker design and QC, or any application requiring an accurate free-field measurement microphone.

In stock
SKU: EARM23BU Category:
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Opened and tested, looks new.  Open box return.

The Earthworks M23 Omnidirectional 23kHz Measurement Microphone is perfect for acoustical measurements such as loudspeaker design and quality control, sound system setup and troubleshooting, room acoustics, and any other application that requires an accurate free-field measuring microphone.

The M23 is noted for its dependable performance, giving exceptional audio quality at a reasonable price. It offers a flat frequency response spanning 9Hz to 23kHz, an extraordinarily consistent omnidirectional polar response, an SPL level of 140dB without distortion, and no handling noise.

Earthworks measuring microphones are an industry standard, with major pro audio firms specifying them for use in acoustic measurement systems. The Earthworks M23 is a low-cost measurement microphone that is available alone or as a matched pair.

Immune to most temperature and atmospheric fluctuations, the M23 delivers reliable and repeatable results in any environment.

Item Includes

  • Earthworks M23
  • MC1 Microphone Clip
  • ADP1 1/2″ Calibrator Adaptor


  • 23kHz flat frequency response
  • Cost effective measurement microphone
  • Improved version of the SMAARTMIC previously offered by EAW
  • Ideally suited for acoustical measurements sound system setup and troubleshooting, room acoustics, or any application where an accurate free-field measurement microphone is required
  • Omnidirectional polar pattern
  • Flat frequency response, fast impulse response and exceptional polar characteristics
  • Used by SMAART, MLSSA, Spectrafoo, TEF and RTA in addition to acoustic measurement systems manufactured by dbx, DEQX and others
  • Meets or exceeds ANSI Type 1 and applicable IEC 61094 requirements
  • Each M Series microphone is delivered with its own calibration chart providing its individually measured open-circuit sensitivity and the frequency response curve
  • Electronic Calibration File available
  • Operating Temp Range: -20 deg C to +60 deg C ( -4 deg. F to 140 deg. F)
  • Storage Temp Range: -40 deg C to +80 deg C ( -40 deg. F to 176 deg. F)
  • Humidity: Up to 90%
  • Re-calibration recommended every five (5) years


  • Frequency Response: 9Hz to 23kHz ±1/-3dB
  • 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
  • Noise: 20dB SPL equivalent (A weighted)
  • Dimensions L x D: 165mm x 22mm (6.5 x .860 inches)
  • Weight: .35 lb. (160g)
Weight 1 lbs