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Loop amplifier for
inductive audio transmission
These instructions are intended for installers
with technical knowledge in inductive sig-
nal transmission . Please read the instructions
carefully prior to operation and keep them
for later reference .
All operating elements and connections
described can be found on the fold-out
page 3 .
1 Overview
1.1 Front panel
1
3 .5 mm jack for headphones; can be used
to monitor the signal for the induction
loop
2
Controls to adjust the volume of the input
channels (INPUT 1 to INPUT 3)
3
Tone controls
BASS = for the low frequencies
TREBLE = for the high frequencies
4
Control MASTER for the field strength
within the induction loop (maximum
volume)
5
ON power LED
SIG signal LED with 3 LED level indicators
above
PROT fault LED
6
POWER switch
1.2 Rear panel
7
Mains jack for connection to a socket
(230 V/ 50 Hz) via the mains cable provided
8
Support for the mains fuse
Always replace a blown fuse by one of
the same type!
9
Screw terminals LOOP OUTPUT to connect
the induction loop
10
Screw terminals MESSAGE TRIGGER for
an external switch to replay the MP3 files
(alarm announcements) from the memory
card (18)
11
Control METAL LOSS CORRECTION
(function only available with jumper J2 in
position ON, refer to chapter 6 .2)
12
Jack SLAVE IN / OUT to connect another
loop amplifier (refer to fig . 4)
13
RCA input jacks INPUT 3 LINE to connect
a (stereo) audio unit with line level output
(CD/MP3 player, radio, mixer etc .)
14
XLR input jack INPUT 3 MIC for a micro-
phone
15
DIP switches:
1 = phantom power for INPUT 3
2 = phantom power for INPUT 2
3 = input sensitivity for INPUT 2: micro-
phone level or line level
16
XLR input jacks INPUT 1 and 2 for micro-
phones or audio units
17
DIP switches for INPUT 1:
1 = priority function (INPUT 2 and 3 will
be muted when a signal is applied)
2 = phantom power (40 V)
3 = input sensitivity of microphone level
or line level
18
Slot for a memory card to replay alarm
announcements (refer to item 10)
2 Safety Notes
The unit corresponds to all relevant directives
of the EU and is therefore marked with .
WARNING
The unit uses dangerous
mains voltage . Leave servic-
ing to skilled personnel and do
not insert anything into the air
vents! Inexpert handling may result in elec-
tric shock .
Always switch off the induction loop system
before making or changing any connections .
•
The unit is suitable for indoor use only . Pro-
tect it against dripping water, splash water
and high air humidity . The admissible ambi-
ent temperature range is 0 – 40 °C .
•
Do not place any vessel filled with liquid on
the unit, e . g . a drinking glass .
•
The heat produced inside the unit must be
dissipated by air circulation; never cover the
air vents of the housing .
•
Do not operate the unit or immediately
disconnect the mains plug from the socket
1 . if the unit or the mains cable is visibly
damaged,
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 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 li-
ability for any resulting personal damage or
material 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 .
•
Likewise, no liability will be accepted for
any data loss as a result of operating errors
or a defect or for any consequential dam-
age caused by this data loss .
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 .
1 .1 Front panel . . . . . . . . . . . . . . 8
1 .2 Rear panel . . . . . . . . . . . . . . 8
4 .1 Rack installation . . . . . . . . . . . 9
5 .1 Induction loop . . . . . . . . . . . . 9
5 .1 .1 Cable cross section . . . . . . . . . 9
5 .1 .2 Connection of the induction loop . . 9
5 .1 .3 Operation with two loop amplifiers . 9
5 .2 Microphones . . . . . . . . . . . . 10
5 .3 Units with line level . . . . . . . . . 10
alarm announcements . . . . . . . 10
5 .5 Application in a PA system . . . . . 10
5 .6 Power supply . . . . . . . . . . . . 10
6 .1 First-time operation . . . . . . . . . 10
6 .2 Metal loss correction . . . . . . . . 11
7 .1 Protective circuit . . . . . . . . . . 11
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