30kHz Battery Powered Measurement Microphone

The M30BX is a cost effective measurement microphone intended for large and small room calibration. The ultra wide frequency response of 9Hz to 30kHz is flat throughout the entire spectrum and results in accurate room calibration using Smaart, MLSSA, SIMM and TEF based systems. The small element yields an omni-directional pattern resulting in a wide pick up area at the front and sides of the microphone capsule.

  • Microphone body opens for replaceable battery access

  • 9Hz – 30kHz flat frequency response

  • Omnidirectional polar pattern

  • Handles up to 140dB SPL without distortion

From $819

  • Microphone body opens for replaceable battery access, with a battery life of 100 hours
  • Works with RTA apps by using iPad / iPhone to TRRS to XLR mic cable
  • 30kHz frequency response
  • 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
  • Improved version of the SMAARTMIC™ previously offered by EAW
  • 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 30kHz ±1/-3dB

Polar Pattern: Omnidirectional

Sensitivity: 34mV/Pa (-29dBV/Pa)

Power Requirements: 6V Battery Type P28 (2CR-1/3N, 4LR44 or equivalent)

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: 220mm x 22mm (8.65 x .860 inches)

Weight: .4 lb. (180g)

M30BX Battery operated 30kHz omnidirectional measurement microphone with built-in preamp

M30BXmp Battery operated 30kHz omnidirectional measurement microphone with built-in preamp – matched pair

  • Test / Measurement
  • ADP1 1/2″ Calibrator Adapter
  • ADP2 XLR/RCA adapter
  • MC3 Microphone Clip

The accuracy of the Earthworks M30 microphone is stunning. I know that when the system is tuned using this microphone the results will be pure audio bliss.

Brad Divens, Front of House Engineer

The Earthworks M30 measurement mic is the first piece of gear I grab for when I’m ready to tune my P.A. system, I know its frequency response is very accurate and will tell me exactly what’s happening in the room.

Rick Camp, Front of House Engineer

Every show I’ve mixed for Umphrey’s McGee is available for download. That requires accurate tuning for my mix to translate to the recording. The M30 is the most accurate way I can measure that.

Chris Mitchell, Front of House Engineer

I’ve been using the M30 all around the world this year and love it. It’s incredibly accurate and dependable.

Benjamin Adamson, Front of House Engineer

I take tuning as seriously as I do mixing. If there’s anything I own that I can honestly say makes it to every gig, its my Earthworks M30.

Chris Rabold, Front of House Engineer