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Metric Halo
Earthworks M23 Ampliar

Earthworks M23

Earthworks M23 is a 23kHz Onmi Measurement microphone

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The M Series has become the accepted standard for affordable, reliable reference and measurement microphones that are accurate in the time domain and frequency response. They are remarkably stable with respect to temperature and atmospheric conditions and are optimized for clean, very fast impulse performance providing accurate wideband response with virtually no handling noise.
Earthworks M23


  • + 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.
    + Requires 48V Phantom Power.
    + 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: -20 deg C to +50 deg C ( -4 deg. F to 122 deg. F).
    + Humidity: Up to 90%
    + Re-calibration recommended every five (5) years.

Frequency Response:                      9Hz to 23 kHz ±1/-3dB               
Polar Patter Omnidirectional
Sensitivity  36mV/Pa (-29dBV/Pa)
Power Requirements 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 LxD 165mm x 22mm (6.5 x 0.860 inches)
Weight 0.35 lb (160g)


Impulse Response  Polar Response  Frequency Response
 impulse response M23 polar response M23  Frequency  

+ Foley Recording.
+ Measurement.
+ Room/Ambient.



M23 User's Manual:
M23 Data Sheet:

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Earthworks M23

Earthworks M23

Earthworks M23 is a 23kHz Onmi Measurement microphone

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