The DM1 is intended for use only with passive microphones – i.e. microphones that do not require phantom power for operation, like passive dynamic and passive ribbon microphones. It will not work with condenser microphones or active ribbon mics.
Please ensure the DM1 is connected securely between your microphone and your mic preamp, and make sure that +48V phantom power is turned ON on your mic preamp. If you are still experiencing problems, please contact your local dealer, or fill out our Support Request form and we’ll help!