Earthworks has become the accepted standard for affordable, reliable reference and measurement microphones. These microphones are accurate in the time domain and frequency response. Earthworks measurement microphones are optimized for clean, very fast impulse performance to provide accurate wideband response. They have virtually no handling noise and are remarkably stable with respect to temperature and atmospheric conditions. Our M Series measurement microphones are used by SMAART™, MLSSA™, Spectrafoo™, TEF™ and RTA in addition to acoustic measurement systems manufactured by dbx, DEQX and others. All models are available in matched pairs.
The M50 (same as M550) is the top of the line measurement microphone with extraordinary impulse response for those who have stringent requirements and demand the very best. This microphone provides laboratory grade accuracy for research "beyond the brick wall." Requires 48V phantom power.

Frequency response: +1/-3dB 5hz to 50kHz
Polar Pattern: Omnidirectional
Sensitivity: 30mV/Pa (-30.5 dBV/Pa)
Power requirements: 48V phantom, 10mA
Max acoustic input: 142dB SPL
Peak output voltage: 10V
Output: XLR intended to drive a balanced transformerless input (pin 2+)
Min output load: 600ohms between pin2 and 3
Noise: 22dB SPL equivalent (A weighted)
Dimensions (LxD): 229mm x 22mm (9 x .860 inches)
Influence of magnetic field: 80A/M induces less than 52dB SPL equivalent