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Earthworks M23

Earthworks M23

Regular price $499.00
Regular price Sale price $499.00
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The M23 is the equivalent of what was once sold exclusively by Rational Acoustics as the “Smaart S30”. The M23 features a flat frequency response from 3 Hz to 23 kHz, and an exceptionally consistent omnidirectional polar response. It has a max 140 dB SPL rating, without distortion. The Earthworks M23 is a very solidly built microphone, resilient against most temperature and atmospheric fluctuations. The M23 delivers reliable results in any environment. 

Every M23 is delivered with its own printed frequency response chart. A detailed Electronic Calibration File (ECF) is generated for each microphone during final testing. Your microphones individual ECF can be downloaded from the Earthworks website after product registration.

Note: When measuring SPL at concert levels the relatively high sensitivity of Earthworks measurement microphones will overload most input devices (preamps) with the microphone outputting max or near maximum voltage. If SPL measurement is critical, we recommend that you confirm that your preamps max input level meets or exceeds +19 dBu so that you do not overload. 

Note:  M23 microphones are not infinitely matched like the M23R


  • Polar Pattern: Omnidirectional
  • Frequency Response Characteristic: Free Field
  • Frequency Range: 3 Hz – 23,000 Hz (Exact value indicated in electronic calibration file)
  • Sensitivity: 34 mV/Pa, typical (exact value indicated on calibration chart)
  • Operating Voltage: 24-48V DC Phantom Power
  • Max SPL: 140 dB SPL


      • 1 Earthworks M23 microphone
      • 1 Mic Clip
      • 1 Calibrator Adapter
      • 1 Calibration Chart
      • ** Electronic Calibration Files may be requested directly from Earthworks after mic has been registered
      M23 Data Sheet