Rolls DU30B Microphone Preamp/Audio Ducker

The DU30b is a microphone preamp and background music preamp. When an announcement is made into the microphone, the music is automatically "ducked" under the announcement. Then the music is brought back to it's previous level.

Feauters:

• Automatically ducks music under announcements
• Perfect for restaurants and small clubs
• Clean, Quiet Mic Preamp

REAR PANEL:

• MIC IN: Female XLR jack for connection to a dynamic or condenser paging microphone.
• PHTM PWR: Jumper for engaging the +12 volt phantom power the microphone input - confi gured OFF from the factory.
• AUX IN: Stereo RCA jacks for connecting to a source different from the Mic In as the master signal.
• LINE IN: Stereo RCA jack for connection to the stereo signal source to be "ducked" such as a tuner, CD player or cassette player.
• OUTPUT: Stereo RCA jacks for connection to the system's amplifiers.
• 12 VDC: Power input. Connect to the enclosed Rolls PS27 ACadapter.

FRONT PANEL:

• MIC/LINE: When pressed in, the gain of the XLR Mic In is reduced by 30 dB
• RELEASE TIME: Adjusts the amount of time for the "ducked" signal to return to its normal level
• Counterclockwise; slow - Clockwise;fast.
• MIC LEVEL: Adjusts the amount of gain in the Mic In circuit
• MIC LEVEL: Adjusts the amount of gain in the Mic In circuit.DUCK SENSITIVITY: The Threshold at which "ducking" begins.When the microphone level reaches the threshold, the signal present at the Line In jacks is reduced until the announcement is over,then the Line In signal returns to its previous level.
• DUCK DEPTH: Adjusts the amount of background signal (or LineIn) reduction - fully counter clockwise the signal is reduced 6 dB,fully clockwise the signal is reduced 70 dB.