Rolls DU30bMic/Line Preampwith

Rolls DU30b — mic/line preamp with automatic audio ducking, designed for background music systems, paging, broadcast, and presentation environments where spoken audio must take priority over music.

The DU30b accepts a microphone or line-level input and feeds a separately controlled line output, while its audio ducking circuit automatically attenuates a connected background music or program source whenever the mic is active. The depth and recovery time of the ducking effect are adjustable, allowing the system to be tuned for smooth, transparent transitions between speech and music rather than abrupt cuts. Useful in restaurants, retail, offices, houses of worship, and broadcast talkback chains where background music must yield to voice without manual fader intervention.

Automatic audio ducking when mic is active

Adjustable ducking depth and recovery time

Suitable for background music, paging, and broadcast