Battery powered 30kHz measurement microphone with built-in preamp

Where to Buy

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.

  • Microphone body opens for replaceable battery access, with a battery life of 300 hours
  • Works with RTA apps by using iPad / iPhone to TRRS to XLR mic cable
  • 30kHz flat frequency response
  • Ideally suited for on-location 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 and portability is important or a power source is not readily available
  • 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: -10 deg C to +40 deg C ( 14 deg. F to 104 deg. F)
  • Storage Temp Range: -20 deg C to +50 deg C ( -4 deg. F to 122 deg. F)
  • Re-calibration recommended every five (5) years

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

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

Frequency Response: 9Hz to 30kHz ±1/-3dB

Polar Pattern: Omnidirectional

Sensitivity: 36mV/Pa (-29dBV/Pa)

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

Max Acoustic Input: 130dB SPL

Output: XLR (pin 2+)

Min Output Impedance: 600Ω

Noise: 20dB SPL equivalent (A weighted)

Dimensions L x D: 220mm x 22mm (8.65 x .860 inches)

Weight: .4 lb. (180g)

Impulse Response

M30BX Impulse

Polar Response

Omni Polar Earthworks

Frequency Response

M30BX Frequency

Foley Recording
“…well-engineered, precision device with very flat frequency response, tight transient response, and a uniform polar response…”
ADP1 1/2″ calibrator adapter for all M Series microphones
ADP2 XLR/RCA adapter for M30Bx
MC1 Standard microphone clip for all M Series microphones
LP20 LevelPad -20dB LP20_A
OMW1 Foam teardrop windscreen for all M Series microphones
OMW2 100 mile per hour foam windscreen for all M Series microphones
OMW3 Standard foam windscreen for all M Series microphones

Other M Series Models

M23 23kHz measurement microphone Go
M30 30kHz measurement microphone Go
M50 50kHz measurement microphone Go