The M30BX provides an impressive frequency response of 9Hz to 30kHz, near-perfect polar response and it will handle up to 138dB SPL. For those looking for an extremely accurate and reliable measurement microphone for field measurement purposes, the Earthworks M30BX is it.
The M30BX comes with an XLR to RCA adapter to facilitate connecting the M30BX to a sound card on your mobile computing device. There is also a small plunger inside the XLR connector that operates an internal battery "on/off" switch that will help preserve battery life. So there is no need for a power "on/off" switch. Just plug in an XLR or the XLR to RCA adapter and the M30BX "powers on." Remove the XLR connector or adapter and the M30BX "powers off."
The Earthworks line of measurement microphones utilizes high current, bipolar Class A amplifier within the microphone, which are made with all discrete components, with no capacitors in the signal path providing the microphone's excellent phase response. This also allows the microphone(s) to feed long signal lines up to 300 feet (91m) and maintain the full frequency response of the microphone at the other end of the line, without loss of high frequencies.
The M30BX comes in a protective carton with a custom die-cut foam insert and its own individual calibration chart. For those who desire calibration files to interface with their software, these are available at no cost. In addition, any number of microphones can be matched for a nominal fee.
