AUDIOropa PROLOOP DCCplus Mode D'emploi page 21

2.8 Metal loss compensation
You will get a loss of the magnetic field strenght if you have strong reinforcement metal in the floor. Compensate this
loss, use the metal loss compensation control (6) on the front side of the loop amplifier. Please follow the steps below
to set the metal loss compensation:
1. Turn the Metal loss compensation control to the left position.
2. Connect headphones to the headphone socket of the amplifier and listen to the audio signal.
3. Use an inductive loop receiver and the same headphones to listen to the audio signals of the inductive loop.
4. Turn the Metal loss compensation control to adjust the tone of the audio signal.
3. Setting up a LOS loop system with PROLOOP DCCplus
If you want to set up a LOS loop system you need two of the PROLOOP DCCplus. The first amplifier will be the
master unit and the second amplifier will be the slave unit.
3.1 Master and Slave settings
- To define the first amplifier as Master amplifier the "0°/90°" switch must be set on 90°.
- A connection cable with a 6.3 mm jack will be plugged into the "SLAVE OUT" socket at the Master amplifier.
- To define the second amplifier as Slave amplifier the connection cable will be plugged into the "SLAVE IN"
socket.
Note
The slave amplifier can only send the signal that it receives from the master amplifier to its induction
loop. The audio inputs and the priority input of the slave amplifier are disabled.
3.2 LOS induction loops
The optimal designs and configurations are always dependent on the venue details, i.e. the floor plans and the
sizes of the rooms serviced, the number of internal induction loops and the demands made on low overspill.
To determine the corresponding values for the »tailored« low-overspill layout and the optimal level adjustments
in each case, it is necessary to use complicated calculation and installation methods. That's why we recommend
that you use the services provided by AUDIOropa. We support architects, technicians and installation experts
qualified in the planning of LOS installations.
3.3 Installation of the induction loop
To use a LOS system, the induction loop must be installed in a special way. In detail, two separate loops are
used (master/slave), which consist of eight-piece segments lined up one after the other. The exact proportions
and the exact number of segments depend on the demands made on low overspill as well as the size of the
room. The smaller the segment, the smaller the overspill will be.
The master loop is laid over the entire area to be serviced. The slave loop is always one segment shorter than the
master loop and doesn't begin until after the first segment half of the master loop. The individual segment lengths
should correspond to the distances between the seating rows.
We recommend using a single-strand cable, e.g. H07V-K or the copper ribbon cable (A-4937-0, 50m role /
A-4948-0, 100m role).
3.4 Advantages of a LOS induction loop design
- No loss of field strength in the centre of the induction loop
- No horizontal overspill
- No signal holes inside the loop
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