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230 V~
50 Hz
FUSE
USE ONLY WITH A 250V FUSE
9
10
minimum latency . The advantage over analog
audio signal transmission is a cost-effective con-
nection of components via standard network ca-
bles and low susceptibility to interference, even
in case of long transmission paths . In addition,
signal routing between components that have
once been connected can be changed by soft-
ware at any time . In the Dante network, units
configured as transmitters are used as signal
sources . By means of the program "Dante Vir-
tual Soundcard" from the company Audinate,
computers can also be used as signal sources,
e . g . to feed audio files replayed on the computer
to the Dante network .
One or both reception channels of PA-
900DT are assigned to any transmitting channels
in the Dante network via the Dante configu-
ration program "Dante Controller" (
ter 7) . In the amplifier, the signals of the two
received channels are mixed to one mono signal .
The Ethernet interface is also configured
via the program "Dante Controller" (
ter 7 .2) . For correct configuration, knowledge in
network technology is indispensable .
Dante™ is a trademark of Audinate Pty Ltd.
4
Setting up the Amplifier
The amplifier is designed for installation into a
rack (482 mm /19"), but it can also be placed
on a table . Do not block the air vents; air must
be able to flow through the air vents to ensure
sufficient cooling of the power amplifier .
4.1 Installation into a rack
For installation into a rack, screw the two
mounting brackets provided to the sides of the
unit . In the rack, the amplifier requires a height
of 2 RS (1 RS = rack space = 44 .45 mm) .
To prevent the rack from becoming top-
heavy, insert the amplifier into the lower section
of the rack . The mounting brackets alone are
not sufficient for fixing it safely; additionally use
lateral rails or a bottom plate to secure the unit .
5
Connecting the PA Amplifier
Connections should only be made by experts . Al-
ways switch off the amplifier before connecting!
5.1 Speakers
Connect either 100 V speakers (fig . 1) and 70 V
speakers (fig . 2) or speakers/speaker groups with
a total impedance of at least 4 Ω (figs . 3 – 5),
refer to page 2 . Depending on the speaker type,
use the corresponding contacts of the terminal
strip SPEAKER OUTPUT (13) . To make handling
DC
SPEAKER
INPUT
OUTPUT
GND
24 V
COM
4Ω
70V 100V
11
12
13
easier, the terminal strip can be removed from
its connector .
When connecting, observe the correct
individual or total impedance of the speakers
and their correct polarity (positive and negative
connections as shown in figs . 1 – 5) . The positive
connection of the speakers is always specially
marked .
Caution! In case of PA speakers with a 70 V
or 100 V audio transformer (figs . 1 and 2), the
total load by the speakers must not exceed
120 W; otherwise, the amplifier will be over-
loaded and may be damaged .
5.2 Microphones
Up to three microphones can be connected to
the inputs INPUT 1 to INPUT 3 (14) . Instead of
☞
chap-
the XLR jack INPUT 1, the screw terminals (20)
can be used alternatively .
1) When connecting a microphone, disengage
the corresponding switch MIC/LINE (19) .
☞
chap-
2) For the jacks to which a phantom-powered
microphone has been connected, use the cor-
responding DIP switch PHANTOM POWER
(22) to activate the 20 V phantom power
(switch in lower position) .
Caution! When the phantom power has
been activated, make sure that no micro-
phone or audio unit with unbalanced output
signal has been connected to the input; it
may be damaged .
5.3 Units with line output
Up to four units with line level output (e . g . CD
player, mixer) can be connected to the inputs
INPUT 1 to INPUT 3 (14) and to the input AUX IN
(17) . When connecting any units to the inputs
INPUT 1 to INPUT 3, engage the corresponding
switch MIC / LINE (19) .
5.4 Inserting an equalizer or
another unit
For external effects on the sound, insert, for
example, an equalizer via the jacks PRE OUT
and AMP IN (15) .
1) Remove the jumper between the connections
PRE OUT and AMP IN: The preamplifier and
the power amplifier will be separated .
2) Connect the input of the unit to the jack PRE
OUT .
3) Connect the output of the unit to the jack
AMP IN .
Note: The amplifier will not deliver any signal if the
unit inserted is not switched on, if it is defective or not
correctly connected .
PRE
LINE
AUX
NETWORK
OUT
OUT
IN
L
L
PUSH
R
R
AMP
IN
14
15
16 17
18
INPUT
INPUT
INPUT
3
2
1
2
1
2
1
2
1
MIC
MIC
MIC
LINE
3
LINE
3
LINE
3
GND
19
20
5.5 Additional amplifier
If the number of the speakers required is higher
than the number admissible for the amplifier, an
additional amplifier will be required (e . g . PA-
900S from MONACOR) . Connect the input of
the additional amplifier to the jack LINE OUT
(16) . The output level at the jack is independent
of the control MASTER VOLUME (5) .
5.6 Power supply and
emergency power supply
For continued operation of the amplifier in
case of mains failure, connect a 24 V emer-
gency power supply unit (e . g . PA-24ESP from
MONACOR) to the terminal strip DC INPUT (12) .
To make handling easier, the terminal strip can
be removed from its connector . Finally connect
the mains cable provided to the mains jack (9)
and then to a mains socket (230 V/ 50 Hz) .
Notes:
1 . When a 24 V voltage from the emergency power
supply unit is applied to the terminals DC INPUT,
it will not be possible to switch off the amplifier
with the POWER switch (8) . In case of mains failure
or when the POWER switch is set to "Off", the
amplifier will automatically switch to emergency
power supply .
2 . During emergency power supply, the amplifier will
deliver less power than during mains supply .
6
Operation
1) Prior to switching on the amplifier for the first
time, first set the controls INPUT 1 to 3 (1)
and the controls NETWORK (2), AUX (3) and
MASTER VOLUME (5) to the position "0" .
2) Use the POWER switch (8) to switch on the
amplifier: The LED ON (6) will light up .
3) Turn up the control MASTER VOLUME (5) so
that the subsequent settings will be audible .
4) Set the volume controls INPUT 1 to 3 (1), NET-
WORK (2) and AUX (3) to the desired value .
5) Use the tone controls BASS and TREBLE (4)
to adjust an optimum sound .
6) Use the control MASTER VOLUME (5) to
adjust the total volume . A row of five LED
indicators (7) will indicate the output level .
Caution: Never set the audio system to a very
high volume . Permanent high volumes may
damage your hearing!
6.1 Talkover function of channel 1
Via channel INPUT 1, announcements can be
made during a music program . For this purpose,
the volume of the other channels will be auto-
matically attenuated by 40 dB . To activate this
function, engage the button AUTOTALK (21) .
AUTO
+20 V
TALK
PHANTOM
POWER
OFF
ON
OFF
n/c
3
2
1
ON
21
22
➆
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