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Bosch Security Systems | 2003-09 | 3922 988 92883en
Plena Mixer Amplifier | Installation and Operating Manual | en | 15
4.4 Microphone inputs
Figure 4.4
Dependent on the microphone choose between the XLR with Phantom power and the 6.3 mm phono jack
connector. Use an extension cable (1) if necessary. When using input 3 or 4 to connect microphones, set the
switches (6) to Mic. When using these inputs as line-inputs, set the switches (6) to Line. To cut-off the lower
frequencies of the signal, activate the speechfilters on the PCB (see §2.2).
4.5 Emergency input
Figure 4.5
The emergency input is for emergency announcements/signals and obviously has the highest priority (all other
inputs are overruled). The emergency volume -which cannot be affected by the master volume control (11) - can be
set at 8, using a screwdriver. It can not be set to zero.
Caution
A connection to a telephone network must always be made via a telephone coupler that provides adequate
isolation between the telephone network (PBX) and the Plena system. The telephone coupler must also meet
all relevant requirements for this type of communication equipment as imposed by law and/or responsible
telecommunication organisations in the country of use. Never try to make a direct connection between the
telephone network and the mixer amplifier.
External settings and connections
2
1
3
4
Mic/Line
M
ic/Li
ne
C
D
L
R
A
ux
L
ineOut1V
In
c
O
u
t
In
T
el
/
Eme
r
.
0
0
2
C
h
i
m
e
4
.5
1-
-3
6 6
1
1
1
5
V
/2
3
0
V
A
p
pa
r
a
t
u
s
d
e
l
i
v
e
r
e
d
c
o
n
n
e
c
te
d
f
o
r
2
3
0
V
-
R
a
t
e
d
i
n
p
u
t
p
o
w
e
r
:
4
0
0
V
A
T
h
i
s
ap
p
a
r
a
t
u
s
m
u
s
t
b
e
e
a
rt
h
e
d
W
ar
n
in
g
2
1
3
4
M
i
c
/
L
i
n
e
M
i
c
/
L
i
n
e
C
D
L
R
A
u
x
L
i
ne
O
u
t
1
V
In
c
Ou
t
In
T
el
/
E
m
er.
0
0
2
C
h
i
m
e
4
.
5
1
-
-
3
C
a
l
l
/
M
i
x
2
4
VD
C
I
n
C
a
l
l
On
l
yMi
xOn
l
y
1
0
0
V0
7
0
V
0
1
0
0
/
7
0
V
0
1
0
0
/
7
0
V
0
8
0
2
1
CD
L
R
A
Tel/
E
mer
.
0
02
Ch
ime
4
.5
1- -3
1
1
5
V/2
3
0
V
Ap
p
a
r
atu
s
d
e
l
i
v
e
r
e
d
co
n
n
e
c
t
e
d
f
o
r
2
3
0
V
-
R
a
t
e
d
i
n
p
u
t
p
o
w
e
r:
4
0
0
V
A
T
h
i
s
a
p
p
a
r
a
tu
s
m
u
s
t
b
e
ea
rt
h
ed
W
a
r
n
i
n
g
2
1
3
4
M
i
c
/
L
i
n
e
M
i
c
/
L
i
n
e
C
D
L
R
A
u
x
L
in
e
O
u
t
1
V
I
n
c
O
u
t
I
n
T
e
l
/E
m
e
r
.
0
0
2
C
h
ime
4
.
5
1
-
-3
C
a
l
l
/
M
i
x
2
4V
DC
I
n
C
a
l
l
O
n
l
yM
i
xOn
l
y
1
0
0
V0
7
0
V
01
00
/
7
0
V
0
10
0
/
7
0
V
0
8
0
8