DU30b Audio Ducker
Connection guide
Rolls Corporation
Salt Lake City, UT
8/19
Made in USA ww.rolls.com
What's in the box?
1 - Made in USA DU30b
1 - 15V power supply PN PS27s
1 - This owners manual
Made in USA ww.rolls.com
CONNECTION:
DESCRIPTION:
- Aut
omatically ducks music under announc
ements
- Per
fec
t for r
estauran
ts and small clubs
- Clean, Quiet M
ic Preamp
The DU30b is a micr
ophone preamp and back
-
ground music pr
eamp. W
hen an announcemen
t is
made into the micr
ophone, the music is aut
omati-
cally “ducked
” under the announc
ement.
Then the
music is brough
t back to it
’s pr
evious level
.
SPECIFICATIONS
Frequency Response
20 Hz - 40 kHz
Input Impedance
100K
Ω
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 y
ou are using a c
ondenser microphone
,
carefully c
onnect the t
wo P
hantom P
ow
er
jumper pins together
. Set the lev
el of the
music signal (Line I
n) for a c
omfor
table level
.
Speak into the micr
ophone and adjust the Mic
Lev
el for a c
omfor
table level
, then adjust the
Sensitivit
y so that the music is mut
ed when
speaking with a nor
mal voic
e. S
et the Release
Time c
ontr
ol for the amoun
t of time you wish
for the A
ux In sig
nal to r
eturn t
o normal
. Set
the Duck D
epth con
trol f
or the amount of A
ux
In sig
nal reduc
tion you w
ant when the M
ic or
Alter
nate sig
nal is presen
t.
- Restaurants
- Clubs
- Schools
... Anywhere you need to duck a paging signal under a
background source.
