the temperature has dropped to an acceptable level. Be aware that this may re-activate
the speaker/shaker.
The third and fourth LEDs down are only for diagnostic purposes by the manufacturer.
4. Low Frequency Tuning
In some situations it can be desired to adapt the low frequency levels per third octave
band to compensate for strong reflections of nearby large walls, or to correct for the
standing waves in a room. In that case the third octave band levels below 400 Hz can
be adapted in level.
The level of the following third bands can be adapted:
F1 : 50 Hz
-6dB/0dB/+6dB
F2 : 63 Hz
-6dB/0dB/+6dB
F3 : 80 Hz
-6dB/0dB/+6dB
F4 : 100 Hz -6dB/0dB/+6dB
F5 : 125 Hz
-6dB/0dB/+6dB
F6 : 163 Hz
-6dB/0dB/+6dB
F7: 200 Hz
-6dB/0dB/+6dB
F8: 250 Hz
-6dB/0dB/+6dB
F9: 315 Hz
-6dB/0dB/+6dB
And the level can be reduced of the remaining frequency range.
F0 : 400-20000 Hz -6dB/0dB/+6dB
It is advised to first measure the microphone spectrum with the amplifier in pink/white
or external in “”E”” setting, and take a note on which third octave bands need level ad-
aptation. You will notice that the output level in “”E”” is always 6dB lower than the “”L””
and “”A”” settings. This is needed for protection of the sound source.
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