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PA-900DT
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INPUT 1
1
PA Mixing Amplifier
Please read the instructions carefully prior to
operation and keep them for later reference .
Connection of the speakers requires ade-
quate technical knowledge in 100 V PA technol-
ogy and is to made by experts only (chapter 5 .1) .
Operation of the amplifier (chapter 6) is easy,
even for adults without any expert knowledge .
In case of any queries, however, please contact
your installer or retailer .
1
Operating Elements and
Connections
1.1 Front panel
1 Volume controls for the mono channels
INPUT 1 to INPUT 3
2 Volume control NETWORK for the signals
from the Dante network
3 Volume control for the AUX channel
4 Tone controls
BASS control; ±10 dB/100 Hz
TREBLE control; ±10 dB/10 kHz
5 Control MASTER VOLUME for the total
volume
6 Power LED
7 Level indicators
8 POWER switch
1.2 Rear panel
9 Mains jack for connection to a mains socket
(230 V/ 50 Hz) via the mains cable provided
10 Support for the mains fuse;
always replace a blown fuse by one of the
same type
11 Clamping screw to be used in case of ground
connection (e . g . when hum problems occur)
12 Screw terminals* for emergency power sup-
⎓
ply (
24 V)
13 Screw terminals* to connect the speakers
14 XLR input jacks of the mono channels
INPUT 1 to INPUT 3 to connect microphones
or mono units with line level output
Caution! When the phantom power has
been activated [corresponding DIP switch
(22) in the lower position], a 20 V phantom
power will be supplied to the XLR jacks . In
this case, make sure that no microphones
or audio units with unbalanced output sig-
nals have been connected; they may be
damaged .
* To make handling easier, the screw terminals can be
removed from their connectors .
8
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10
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10
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10
INPUT 2
INPUT 3
NETWORK
2
15 Feed-through connections PRE OUT and
AMP IN to insert a unit (e . g . equalizer); the
output level at the jack PRE OUT is inde-
pendent of the control MASTER VOLUME (5)
16 Output LINE OUT to connect additional am-
plifiers;
the output level is independent of the con-
trol MASTER VOLUME (5)
17 Input AUX IN to connect audio units, e . g .
CD player, tuner, mixer, etc .
18 RJ45 jack for network connection
19 Selector switches for the mono channels
INPUT 1 – 3; to switch between microphone
level (button disengaged) and line level (but-
ton engaged)
20 Screw terminals to connect a microphone
or an audio unit with line level output; con-
nected in parallel to the XLR jack INPUT 1
21 Button AUTOTALK to activate/deactivate the
talkover function of channel 1
22 DIP switches +20 V PHANTOM POWER to
activate the 20 V phantom power for the
XLR jacks INPUT 1 to INPUT 3 (14); required
when connecting condenser microphones or
electret microphones using phantom power
Caution! To prevent switching noise, only
use the switches when the amplifier has
been switched off . Please refer to the note
under item 14 .
2
Safety Notes
The unit corresponds to all required directives of
the EU and is therefore marked with
WARNING The unit uses dangerous mains
During operation, there is a hazard of contact
with a dangerous voltage up to 100 V at the
speaker terminals (13) . Always switch off the
PA system before making or changing any
connections .
Do not insert anything into the air vents: Elec-
tric shock hazard!
•
The unit is suitable for indoor use only . Protect
it against dripping water, splash water, high
air humidity and heat (admissible ambient
temperature range: 0 – 40 °C) .
•
Do not place any vessel filled with liquid on
the unit, e . g . a drinking glass .
0
10
–10
dB
+10
–10
dB
+10
AUX
BASS
TREBLE
3
4
.
voltage . Leave servicing to skilled
personnel only . Inexpert handling
may result in electric shock .
+3
0 dB
–3
–8
–13
0
10
ON
MASTER
POWER
VOLUME
5
6
7
•
The heat produced inside the unit must be
dissipated by air circulation; never cover the
air vents .
•
Do not operate the unit and immediately dis-
connect the mains plug from the socket
1 . if the unit or the mains cable is visibly dam-
aged,
2 . if a defect might have occurred after the
unit was dropped or suffered a similar ac-
cident,
3 . if malfunctions occur .
In any case the unit must be repaired by skilled
personnel .
•
Never pull the mains cable to disconnect 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 liabil-
ity for any resulting personal damage or mate-
rial damage will be accepted if the unit is used
for other purposes than originally intended, if
it is not correctly connected or operated, or if
it is not repaired in an expert way .
If the unit is to be put out of operation
definitively, take it to a local recycling
plant for a disposal which is not harm-
ful to the environment
3
Applications
The amplifier is specially designed for PA sys-
tems . It is able to supply an RMS power of 120 W
to 100 V or 70 V speakers or to a speaker group
with a total impedance of 4 Ω . Microphones
(channels 1 – 3) or units with line level (chan-
nels 1 – 3 and AUX) can be connected to the
input channels; these input channels can be
mixed with one another . The fifth input of the
amplifier is an Ethernet interface for connection
to a Dante audio network . From this network,
audio signals can be received via one or two
Dante channels .
Input channel 1 of the amplifier is equipped
with a talkover function . When an announce-
ment is made, this function will attenuate the
volume of the other channels by 40 dB .
3.1 Dante
Dante, an audio network developed by the
company Audinate, allows transmission of up
to 512 audio channels at the same time . Dante
(Digital Audio Network Through Ethernet) uses
a common Ethernet standard and is based on
the Internet protocol . The transmission of audio
signals is uncompressed and synchronized, with
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