Earthworks M30BX
Battery Powered M30 with Built-In Preamp, High Definition Measurement Microphone


Designed to work with laptop computers, our battery operated version of the M30 has a built-in preamp with a +14dB gain switch.

The M30 is a very cost effective reference microphone for SMAART™, MLSSA™, Spectrafoo™, TEF™ & RTA and all “audio band” measurements. It has a flat frequency response, fast impulse response and exceptional polar characteristics.


  • Frequency Response: 9Hz to 30kHz
  • Polar Pattern: Omnidirectional
  • Sensitivity: 8mV/Pa or 40mV/Pa with 14dB gain
  • Power Requirements: 6V battery-P28 (2CR-1/3N) Lithium or 4 LR44 Alkaline (approx. 300 hours work time)
  • Peak Acoustic Input: 140dB SPL, 126dB SPL with 14dB gain
  • Output: XLR (PIN 2+) drives balanced or unbalanced input, drives most sound card inputs directly
  • Minimum Output Load: 600 ohms between pins 2 & 3
  • Noise: 27dB SPL equivalent (A weighted)
  • Product Dimensions (L x D): 9" x .860"
  • Product Weight: .4 lb
  • Shipping Dimensions (H x W x D): 14" x 8" x 6"
  • Shipping Weight: 3 lbs
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