Abstract: A removable condenser microphone assembly comprises a large-diaphragm condenser transducer having front and rear diaphragms; a cylindrical harness inside of which the transducer is mounted; a cylindrical ring inside of which the harness is mounted; a connector secured to the bottom of the ring configured to removably secure the microphone assembly to a body of a pencil microphone and to removably electrically couple the microphone assembly to pre-amp circuitry within the pencil microphone body; a switch secured to the ring; and a printed circuit board electrically coupled to the transducer and the switch and, in response to positions of the switch, separately control phantom power to the front and rear diaphragms of the transducer creating a plurality of selectable polar patterns of the transducer.