AUDIOropa PROLOOP LOSplus Mode D'emploi page 23

3. Before you adjust the line level, don't forget to apply a test signal to the INPUT2. We recommend using our
test CD, which comes with the FSMplus (A-4292-0).
Use a 1kHz sine signal (track 3 on the CD) and set the volume control (master fader) on the mixing desk or
the audio amplifier as it is normally used at your events.
4. Adjust the input sensitivity regulator (5) of the INPUT2 so that two green LEDs of the level indicator for com-
pression light up on the front panel of the device.
5. Turn the left current regulator (10) to the central setting. The control indicator (2) on the front panel should
now light up.
6. Set the FSMplus to "Norm" and "0dB scale" and hold it vertically to the induction loop level. The ideal height
depends on what the induction loop system is being used for; typically, this might be 1.20m (for seated au-
diences) or 1.70m (for standing audiences).
7. Check the average field strength by running diagonally over the induction loop area and determine the aver-
age of the values indicated. The average value has to measure 0dB (±3dB).
If you do not obtain this value, adjust the corresponding control until this value is reached. Please note that
every time you cross a cable, the field strength will drop briefly. This is normal as long as only one loop is in
operation.
8. Once the master loop is adjusted, switch off the amplifier and disconnect the master induction loop.
9. Now switch on the amplifier again. Important: Do not alter any mentioned control of the amplifier.
10. Turn the right current regulator (10) to the central setting. The control indicator (2) on the front panel should
now light up.
11. Check the average field strength as described under point 7.
12. If you have set up the slave induction loop, switch the amplifier off.
13. Re-connect the master induction loop to the amplifier.
14. Switch on the amplifer, again.
15. For the final check, use a normal audio signal, such as music or voice via the microphone and check the
field strength with the FSMplus. The value should read 0dB (±3dB) in the signal peaks.
If you do not read these values, repeat the measurement process starting from Step 3 and set the controls
higher than for the first test.
16. If the values lie within the stipulated range, the amplifier is set to the ideal levels. Use the headphone jack
of the FSMplus to evaluate the sound of the signal with a pair of headphones.
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