Free-field microphones

¼" Free-field microphone Type 40BF - High-level
½" Free-field microphone Type 40AM - Prepolarised, Wide-frequency
½" Free-field microphone Type 40AC - Wide-frequency
½" Free-field microphone Type 40AE - Prepolarised
½" Free-field microphone Type 40AF - High-sensitivity
½" Free-field microphone Type 40AN - Low-frequency
¼" Free-field microphone Type 40BE - Prepolarised, High-level
½″ Free-field microphone Type 40AZ - Infra-sound

A free-field microphone is designed to measure the sound pressure in a sound field and compensate for the influence of its presence in the sound field.

A free-field microphone measures the sound pressure as it existed before the microphone was introduced into the sound field; in effect, maintaining free-field conditions.

A free-field microphone should be pointed towards the sound source, i.e. at an angle of 0º incidence to the source..