The CHM99, part of the 99ers Series, is a hanging microphone module with cardioid polar pattern, used to record music, choirs, speech or even surveillance. It can be used in many venues such as houses of worship, conference rooms or on theatre stages. The CHM99 is available in black or white.

A 10m cable that is designed to minimise twisting and a spring steel hanging clamp for precise microphone alignment keeps the microphone securely in its position. The attached phantom power adapter connects to any standard mixer input with 9V to 52V power supply.

CHM99 Hanging mics can be used in pairs for stereo recording techniques such as XY (coincident pair) stereo recording. This is an effective way to produce stereo recordings, especially choirs. However, the sound source locations are defined only by intensity differences. Adjusting the angle between the microphones determines the width and depth of the stereo image.

ORTF stereo recording was developed by the French Broadcasting Authority. This technique differs from the XY technique by recording not only intensity differences, but also delay differences. The capsules should be aligned at an angle of precisely 110° and 170 mm apart for this technique.