The M30 from Earthworks is a cost effective measurement microphone intended for large and small room calibration. The ultra wide frequency response of 9Hz to 27kHz 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 omnidirectional pattern resulting in a wide pick up area at the front and sides of the microphone capsule.