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Low Impedance Loudspeakers; Mains Connection - Bosch LBB 1930 Installation And Operating Manual

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Plena Booster Amplifier | Installation and Operating Manual |
LBB1938 only:
Ensure that the fuse for loudspeaker voltage selection is properly set (see chapter 2). The Priority Only and No
Priority outputs are controlled by a priority relay. The Priority Only output only provides priority announcements,
while the No Priority output just provides the program signal and switches OFF at priority calls. You can also use
the Priority Only output for 3-wire remote volume control override. In this case, ensure that the selected voltage for
the Priority Only output is the same as for the direct output used.

4.5.2Low impedance loudspeakers

Connect low impedance loudspeakers to the 8 Ohm/0 terminals. This output can deliver the rated output power
into an 8 Ohm load. Connect multiple loudspeakers in a series/parallel-arrangement to make the combined
impedance 8 Ohm or higher. Check the loudspeaker polarity for in-phase connection.

4.6 Mains connection

11
2 3 0 V
- 2 4
7 0 V
0 V -
0
2 4 V
0
D C IN
8
-
+
Li ne
fu se
2 5 0 V
T 1 A
W ar ni
A p p ar
ng
at us
Th is
co nn
d el iv
ap pa
ec te d
er ed
ra tu s
m us t
fo r 2
be ea
3 0 V -
rth ed
Figure 4.11
Use the supplied mains cord to connect the system to the mains supply.
Note (LBB 1930 and LBB 1935 only)
If necessary set the mains voltage switch 230/240 V (11) to the required voltage using a sharp object,
e.g. a small screwdriver.
Bosch Security Systems | 2003-09 | 3922 988 92983en
LBB1930
LBB1935
Tel/E
L
0
mer.
R
0 2
CD
Chim
Out
e
Aux
1- -3
Line
4 .5
Out 1V
In
Mic/ Line
Inc
1
Mic/ Line
2
230 V-
100V
240 V-
70V
0
0
3
8
24V
-
DC IN
+
4
Line
fuse
250 V
T1A
Warn
ing
This
appar
App aratu
atus
must
conn
s deliv
be earthe
ecte d
for 230
ered
d
V-
External settings and connections
W ar ni
ng
Th is
ap pa
ra tu s
m us t
be ea
rt he d
Figure 4.12
en | 17
LBB1938
War ning
This
appa
ratus
must
be earth
ed

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This manual is also suitable for:

Lbb 1935Lbb 1938