Operating instructions
Bosch Security Systems | 2003-09 | 3922 988 99482en
Plena Universal Pre-amplifier | Installation and Operating Manual | en | 14
4.3 Insertion or Cascade connection
Figure 4.3 Figure 4.4
If you use the insertion or cascade mode, you must set the 'Ins/Casc' switch, on the rear, in the correct position.
The insertion mode can be used to connect an external sound-processing device, e.g. an equaliser. To increase the
number of input channels, you must use the cascade mode to link pre-amplifiers. E.g. with 2 pre-amplifiers, the
second preamplifier has 8 channels on its master output (4 channels from the first pre-amplifier and 4 channels of its
own).
4.4 Connect a Booster amplifier or System pre-amplifier
Figure 4.5
The master output and/or the direct outputs can be connected to a Plena Booster to amplify the signal to
loudspeaker level. You can also use the outputs to connect the universal pre-amplifier to the System pre-amplifier or
other equipment. The Master Mic output (DIN) has a priority relay contact on pin 4 and 5. This relay is activated
when a priority contact of one of the inputs is closed.
External settings and connections
0
R
a
t
e
d
i
n
p
u
t
P
o
w
e
r
:
2
5
V
A
T
0
.5
A
L25
0
V
T
h
i
s
a
p
p
a
r
a
tu
s
m
us
tb
e
e
ar
t
he
d
Wa
r
n
in
g
1
1
5
V
-
+
2
4
V-
+
2
4
V-
2
3
0
V
-
A
p
p
a
r
a
tu
sd
e
l
i
v
i
r
e
d
c
o
n
n
e
c
t
e
d
f
o
r
2
3
0
V
-
2
1
+
-
G
N
D
3
1
2
+
-
G
N
D
3
L
R
1-
4
3
5
1-
4
3
5
1-
4
3
5
Di
r
.O
ut1
Di
r.
O
ut
2
Di
r
.O
ut3
D
i
r.
O
ut4
I
n
s
/
Cas
c
/
E
m
g
l
n
I
n
s
/
Ca
s
c
I
n
s
/
Ca
s
c
O
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t
M
a
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r
L
i
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O
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t
M
a
s
t
e
r
M
i
c
.
O
u
t
1-
4
3
5
1-
4
3
5
LB
B
1
9
2
0
/
0
0
89
0
0
19
2000
0
5
1
15
/
23
0
V
~,
5
0
/
6
0H
z
No.
1
/
L
i
n
e
2
/
L
i
ne
3
/
L
i
n
e
4
/
L
i
ne
E
M
G
O
u
t
D
C
I
n
D
C
O
u
t
3
5
4
1
2
EQUALISER
0
R
a
t
e
d
i
n
p
u
t
P
o
w
e
r
:
2
5
V
A
T
0
.5
A
L25
0
V
T
h
i
s
ap
p
ar
a
t
us
m
us
t
b
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e
a
r
t
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d
Wa
r
n
i
n
g
1
1
5
V
-
+2
4
V
-
+
2
4
V
-
2
3
0
V
-
A
p
p
a
r
a
t
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s
d
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l
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v
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d
c
o
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c
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d
f
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r
2
3
0
V
-
2
1
+
-
G
N
D
3
1
2
+
-
G
N
D
3
L
R
1-
4
3
5
1
-
4
3
5
1-
4
3
5
D
i
r
.O
u
t
1
D
i
r
.O
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t2
D
i
r
.O
u
t
3
D
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r
.
O
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t
4
I
n
s
/
C
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s
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E
m
gl
n
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/
C
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I
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C
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O
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M
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O
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t
1
-
4
3
5
1-
4
3
5
L
BB
1
9
20
/
0
0
8
9
0
0
1
9
2
00
005
1
1
5
/
2
3
0
V
~
,
5
0
/
6
0
H
z
N
o
.
1
/
L
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e
2
/
L
i
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e
3
/
L
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4
/
L
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EM
G
O
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D
C
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D
C
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3
5
4
1
2
0
R
a
te
d
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n
p
ut
P
o
w
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r
:
2
5
V
A
T
0
.
5
A
L2
5
0
V
T
h
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1
1
5
V
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4
V
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4
V
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2
3
0
V
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p
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2
3
0
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-
2
1
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N
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3
1
2
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G
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3
L
R
1
-
4
3
5
1-
4
3
5
1-
4
3
5
D
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D
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D
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D
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4
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1
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4
3
5
1-
4
3
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LB
B1
9
20
/
0
0
8
90
0
1
9
2
000
05
1
1
5
/
2
3
0
V
~
,
5
0
/
6
0
H
z
No
.
1
/
L
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2
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L
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3
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L
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4
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L
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EM
G
O
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t
D
C
I
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DC
O
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3
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4
1
2
0
R
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te
d
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p
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P
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w
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r
:
2
5
V
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T
0
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L
2
5
0
V
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W
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1
1
5
V
-
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4
V
-
+2
4
V
-
2
3
0
V
-
A
p
p
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r
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t
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3
0
V
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2
1
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N
D
3
1
2
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G
N
D
3
L
R
1
-
4
3
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1
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4
3
5
1
-
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3
5
Dir
.
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1
D
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2
Di
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3
D
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3
5
L
B
B
1
9
2
0
/
0
0
8
9
0
01
9
2
00
0
0
5
1
1
5
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23
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~
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0
/
6
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z
N
o
.
1/Li
ne
2/Li
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e
3/Li
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4
/
Li
ne
E
M
GOut
D
CIn
DCOut
3
5
4
1
2
0
R
a
t
e
d
in
p
u
t
P
o
w
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r
:
2
5
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A
T
0
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A
L
2
5
0
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T
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3
0
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2
1
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-
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D
3
1
2
+
-
G
N
D
3
L
R
1
-
4
3
5
1
-
4
3
5
1
-
4
3
5
Dir
.
O
u
t1
D
i
r
.
O
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t2
D
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.
O
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t
3
D
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O
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1
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5
L
B
B
1
9
2
0
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0
0
8
9
0
0
19
2
0
0
0
0
5
1
1
5
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0
V
~
,
5
0
/
6
0
H
z
N
o
.
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e
2/Li
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3/Lin
e
4
/
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ne
E
M
G
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t
D
CIn
DCOut
3
5
4
1
2
0
d
B
-6
d
B
-
20 d
B
Pow
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r
/
L
in
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P
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w
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C
D
A
U
X
S
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l
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c
t
Z
1
Z2
Z3
+
+
Z4
Z5
Z6
0
dB
-
6
d
B
-
20
dB
P
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M
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