The M31 is a low voltage
electret condenser microphone specifically designed for the measurement
of transducers, loudspeaker systems, room response, and other similar
acoustic characteristics. The M31 provides a very cost effective
solution to many general purpose acoustic measurements. This microphone
features low cost, wide smooth frequency response, small size, and
easy interface/power requirements.
The small diameter (0.3 Inches)
and size of this microphone makes this an excellent choice for near
field measurements and in other locations where space is at a premium.
The small diameter also produces less directional sensitivity for
high frequency measurements. The low voltage and current requirements
of the microphone/preamp allow for easy setup and operation from
a wide variety of power supplies, and can even be powered using
a standard 9V battery.