Philips SQ 45 User Manual
Philips
Communication &
Security Systems
SQ 45
High Performance Power Amplifier
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VU
SQ 45
LBB 1342, 1343, 1344, 1346, 1347, 1348
User Manual
ENGLISH
Instructions for use page 1
TABLE OF CONTENTS
1 Introduction page 1
2 Installation 2
3 Controls 5
6 Technical data 6
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SQ 45
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S 1
Fig. 1 - Front view
Fig. 2 - Rear view
Fig. 3 - Top view
220V - 230V
240V
127V 110V
RED
GRN
BLK
YEL
BLUE
BRN
RED
GRN
BLK
YEL
BLUE
BRN
RED RED
GRN
GRN
BLK
BLK
YEL
YEL
BLUE
BLUE
BRN
BRN
0V + 48 V DC Emergency
battery supply
Remote switch
Open = DC power ON
Closed = DC power OFF
CALL
MUSIC
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5
100V
70V
50V
0V
0V
0V
TEST INPUT
TEST INPUT
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48V
MAINS
DC
POWER
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-
Fig. 4 - Mains connections
Fig. 5 - Battery supply
Fig. 6 - SQ45 Block diagram
1
ENGLISH
The following list gives the amplifier
configurations (see fig.8) available in the
Power Amplifiers series 100, 70 and 50 V
output:
■
LBB 1342/40 1 x 100 Watt
■
LBB 1343/40 2 x 100 Watt
■
LBB 1344/40 1 x 200 Watt
■
LBB 1346/40 4 x 100 Watt
■
LBB 1347/40 2 x 200 Watt
■
LBB 1348/40 1 x 400 Watt
Illustrations are printed on the inside of the
two-fold-out cover pages.
A mounting kit for table top version is
available under type nr. LBB 1329/30
1 INTRODUCTION
The SQ 45 range of high performance audio
power amplifiers have been designed for
smooth operation in professional Public
Address projects. Ease of installation, along
with good service accessibility and reliability
have been optimized in their design.
The mechanical housing for the range of
SQ 45 amplifiers has been designed to
accommodate up to a maximum of four
individual amplifiers in a single housing,
using a common power supply, therefore
saving both cost and space.
Because of the SQ 45 mechanical housing, a
number of configurations are available to suit
a variety of application needs. The units can
be easily mounted into 19” racks.
Each individual amplifier has two balanced
audio inputs:
■
‘music’ input, with adjustable pre-set level
control, for (continuous) back-ground
music.
■
‘priority’ input with fixed input level for
(occasional) paging and other calls.
The ‘music’ input is normally active until a
call is made, at which time the in-built relay
switches the amplifier to the ‘priority’ input,
overriding the music signal, and its volume
setting. When the call is finished the relay
switches the amplifier back to the music
input and the music signal resumes at its
normal level. The change over from one
input to the other can be controlled
remotely.
An electronically balanced ‘test’ input is
provided, into which an in- audible signal
may be injected. This signal is sampled at
the output to provide continuous
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