The easy to use Rolls DU30b Audio Ducker with Microphone Preamp is designed for a small club, restaurant, or store where voice paging is required to be heard over background music.
The unit inputs the music source via a pair of RCA inputs, while the microphone is connected via an XLR input that can supply +12V phantom power. If another source other than voice needs to control the ducking, that can be brought into the unit on additional RCA jacks.
The microphone input has a pad in case the microphone being used has a high output. The sensitivity control of the DU30b sets the threshold at which the microphone will duck the music, and a mic level knob controls the volume of the microphone input.
| Number of Channels | 1 |
| Inputs | 1 x XLR microphone, 2 x RCA coaxial Music In, 2 x RCA coaxial Alt In |
| Output | 2 x RCA coaxial |
| Phantom Power | +12V |
| Multi Function | No |
| Gain Range | Not Specified by Manufacturer |
| Maximum Output Level | Not Specified by Manufacturer |
| Frequency Response | 20Hz to 40kHz |
| Noise | Noise floor -78dBu |
| Dimensions | Desktop enclosure |
| Specialties | A repeating announcement on prerecorded media can be used as a trigger via the "alt input" jacks |