Rolls Audio Ducker DU30b Manual

Rolls Modtager Audio Ducker DU30b

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Side 1/1

Rolls Corporation

Salt Lake City, UT

9/05

Automatically ducks music under announcements

- Perfect for restaurants and small clubs

- Clean, Quiet Mic Preamp

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.

SPECIFICATIONS

Frequency Response 20 Hz - 40 kHz

nput Impedance 100K

Ω

unbalanced, 600

Ω

balanced

THD + Noise <0.03% typical

Noise Floor -78 dB

ndicators Power LED

nput/Output jacks XLR balanced output

RCA unbalanced input and output

Size: 4" x 4" x 1.5"

Weight: 1 lb. (.5 kg)

Power: 12 - 16 VDC 50mA

5 x 1.2 mm DC Jack - Center Negative

Thank you for your purchase of the Rolls DU30b Mic Preamp Audio

Ducker. This device temporarily and automatically mutes or “ducks” a

background music signal under a paging microphone or other auxil-

iary signal. After the announcement, the music level is automatically

returned to it’s previous level.

DESCRIPTION

REAR PANEL

MIC IN: Female XLR jack for con-

nection to a dynamic or condens-

er paging microphone.

PHTM PWR: Jumper for engag-

ing the +12 volt phantom power to

the microphone input - configured

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 ampli-

fiers.

12 VDC: Power input. Connect

to the enclosed Rolls PS27 AC

adapter.

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 - Clock-

wise; fast.

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 pres-

ent at the Line In jacks is reduced until the announcement is over,

then the Line In signal returns to its previous level

A NOTE ON THE DU30b THRESHOLD SETTING, WITH THE SENSI-

TIVITY CONTROL FULLY CLOCKWISE: If the control (paging) signal is on

the XLR input, then ducking begins (the threshold is) at -40 dB when the

Mic/Line switch is set to “Mic”, and 0 dB when the switch is set to “Line”. If

the control signal is on the RCA input, ducking begins at -40 dB.

DUCK DEPTH

Adjusts the amount of background signal (or Line

In) reduction

fully counter clockwise the signal is reduced 6 dB,

fully clo

ckwise the signal is reduced 70 dB.

OPERATION

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.

WARRANTY

For information on the Rolls One Year Limited Warranty, and

to register this product, visit our website at

www.rolls.com

DU30B SCHEMATIC

Produkt Specifikationer

Mærke:	Rolls
Kategori:	Modtager
Model:	Audio Ducker DU30b

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