DU30b Audio Ducker
Connection guide
Rolls Corporation
Salt Lake City, UT
8/19
What's in the box?
1 - Made in USA DU30b
1 - 15V power supply PN PS27s
1 - This owners manual
CONNECTION:
DESCRIPTION:
-
Automatically ducks music under announcements
- Perfect for restaurants and small clubs
- Clean, Quiet Mic Preamp
The DU30b is a microphone preamp and back-
ground music preamp. When an announcement is
made into the microphone, the music is automati-
cally “ducked” under the announcement. Then the
music is brought back to it’s previous level.
SPECIFICATIONS
Frequency Response 20 Hz - 40 kHz
Input Impedance 100KΩ unbalanced, 600 Ω balanced
THD + Noise <0.03% typical
Noise Floor -78 dB
Indicators Power LED
Input/Output jacks XLR balanced input
RCA unbalanced input and output
Size: 4" x 4" x 1.5"
Weight: 1 lb. (.5 kg)
Power: 12 - 15 VDC 500mA
5 x 1.2 mm DC Jack - Center Negative
If you are using a condenser microphone,
carefully connect the two Phantom Power
jumper pins together. Set the level of the
music signal (Line In) for a comfortable level.
Speak into the microphone and adjust the Mic
Level for a comfortable level, then adjust the
Sensitivity so that the music is muted when
speaking with a normal voice. Set the Release
Time control for the amount of time you wish
for the Aux In signal to return to normal. Set
the Duck Depth control for the amount of Aux
In signal reduction you want when the Mic or
Alternate signal is present.
- Restaurants
- Clubs
- Schools
... Anywhere you need to duck a paging signal under a
background source.
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