dbx RTA-M Driverack series Reference Microphone Omni-directional, flat frequency measurement microphone specially designed for the dbx Drive rack series Ideal for optimizing the sound quality of even the most difficult of acoustic environments Picks up all frequencies from 20 Hz to 20 kHz , ensuring accurate "pinking"/real-time analysis of your audio Runs on phantom power (supplied by the Drive rack units) Includes a clip and case