+3
0dB
–3
–8
–13
ON
POWER
–10
+10
dB
BASS
–10
+10
dB
TREBLE
0
10
MASTER
VOLUME
PA-900S
1
2
3
5
4
6
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➅
PA Power Amplifier
Please read these instructions carefully prior to
operation and keep them for later reference .
Connection of the speakers (chapter 5 .1)
requires adequate technical knowledge
in 100 V PA technology and is to be made
by experts only . Operation of the amplifier
is easy, even for adults without any expert
knowledge . However, in case of any queries,
please contact your installer or retailer .
1 Operating Elements
and Connections
1
Tone controls
BASS = ±10 dB at 100 Hz
TREBLE = ±10 dB at 10 kHz
2
MASTER VOLUME control
3
VU-meter
4
Power LED
5
POWER switch
6
Mains jack for connection to a mains
socket (230 V/ 50 Hz) via the supplied
mains cable
7
Support for the mains fuse;
replace a burnt-out fuse by one of the
same type only
8
Clamping screw for a possible ground
connection (e . g . in case of hum problems)
9
Screw terminals* for an emergency supply
volt age (24 V
⎓
)
10
Screw terminals* for connecting the
speakers
11
XLR output for connecting another am-
plifier;
the output level depends on the MASTER
VOLUME control (2), however, not on the
tone controls (1)
12
Button for activating the low-bass filter;
to suppress low-frequency interfering sig-
nals, e . g . hum noise
13
XLR input jack for connecting a signal
source with line output (mixer, preampli-
fier, PA mixing amplifier, etc .)
14
Line input with screw terminals, as an al-
ternative to the XLR input (13)
2 Safety Notes
This unit corresponds to all relevant directives
of the EU and is therefore marked with .
WARNING
The unit is supplied with haz-
ardous mains voltage . Leave
servicing to skilled personnel
only . Inexpert handling or
modification of the unit may cause an elec-
tric shock hazard .
During operation, there is a hazard of con-
tact at the speaker terminals (10) with a
dangerous voltage up to 100 V . Always
switch off the PA system before making or
changing any connections .
Do not insert anything into the air vents; this
may result in an electric shock!
•
The unit is suitable for indoor use only . Pro-
tect it against dripping water and splash
water, high air humidity, and heat (admis-
sible ambient temperature range 0 – 40 °C) .
•
Do not place any vessels filled with liquid,
e . g . drinking glasses, on the unit .
•
The heat being generated in the unit must
be dissipated by circulation . Therefore,
never cover the air vents .
•
Do not operate the unit and immediately
disconnect the mains plug from the socket
1 . in case of visible damage to the unit or
to the mains cable,
2 . if a defect might have occurred after the
unit was dropped or suffered a similar
accident,
3 . if malfunctions occur .
In any case the unit must be repaired by
skilled personnel .
•
Never pull the mains cable for disconnect-
ing the mains plug from the socket, always
seize the plug .
•
For cleaning only use a dry, soft cloth; never
use water or chemicals .
•
No guarantee claims for the unit and no
liability for any resulting personal damage
or material damage will be accepted if the
unit is used for other purposes than orig-
inally intended, if it is not correctly con-
nected or operated, if it is not repaired in
an expert way, or if it is overloaded .
If the unit is to be put out of oper-
ation definitively, take it to a local
recycling plant for a disposal which
is not harmful to the environment .
3 Applications
The amplifier is specially designed for PA sys-
tems . It is able to supply 120 W RMS to 100 V
or 70 V speakers or to a speaker group with a
total impedance of 4 Ω . Examples of speaker
connections can be found in the figures 1 to
5 on page 2 .
4 Setting up the Amplifier
The amplifier is designed for installation into
a rack (482 mm / 19”), however, it can also
be used as a table top unit . In any case, air
must be allowed to pass freely through all
air vents to ensure sufficient cooling of the
power amplifier .
4.1 Rack installation
For rack installation, screw the two mounting
brack ets supplied to the sides of the unit . In
the rack, 2 rack spaces are required for the
amplifier (1 rack space = 44 .5 mm) .
To prevent top-heaviness of the rack, the
amplifier must be inserted into the lower part
of the rack . The front panel alone will not be
able to secure the unit . Side rails or a base
plate must additionally be provided .
5 Connecting the PA Amplifier
All connections should only be made by
skilled personnel and with the amplifier
switched off!
5.1 Speakers
It is possible to connect PA speakers or
speakers
/
speaker groups with a mini-
mum total impedance of 4 Ω . Examples of
speaker connections are shown in figs . 1 to 5
(page 2) . Depending on the speaker type,
use the corresponding contacts of the termi-
nal strip SPEAKER OUTPUT (10) . To facilitate
handling, the terminal strip can be removed
from its plug-in connection .
When connecting, observe the correct
individual or total impedance of the speakers
and their correct polarity (positive and nega-
tive connections as shown in figs . 1 to 5) . The
positive connection of the speakers is always
specially coded .
Caution!
With PA speakers with a 70 V
or 100 V audio transformer (figs . 1 and 2),
the total load by the speakers must not ex-
ceed 120 W RMS, otherwise the amplifier
will be overloaded and may be damaged .
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* The screw terminals can be removed from their
plug-in connections .