Microphone Sensitivity; Speech Filter; Priority Mode - Bosch PLENA PLN-6AIO240 Installation And Operating Manual

26 en | Configuration
7.3.2

Microphone sensitivity

The setting for the microphone sensitivity sets the gain of the microphone amplifier in front of
the signal limiter. The output level preset (item (8) in Call Station hardware configuration, page
24) sets the volume of the output after the signal limiter. Note that these are two different
things. The output level sets the maximum loudness of the announcements in the zones, while
the sensitivity setting compensates for loud or soft speaking voices. Soft speakers or speakers
that keep much distance from the microphone should use a high sensitivity. Be careful with
selecting a high sensitivity in combination with a high output level, when the zone
loudspeakers are in the same area as the call station. This might result in acoustic feedback
(howling).
1.
2.
3.
Sensitivity
1
2
3
4
5
6 (max)
Table 7.4: Microphone sensitivity settings
7.3.3

Speech filter

The speech filter removes the lowest frequencies of the speech signal, that are especially
present when talking close into the microphone. Removing the lowest frequencies reduces the
risk for amplifier overloading and in general improves intelligibility.
1.
2.
3.
Speech filter
Filtered response
Flat response
Table 7.5: Speech filter settings
7.3.4

Priority mode

This setting determines what happens when more than one Call Station is connected to the
All‑in‑One Unit. For consistent behavior make sure that all connected Call Stations use the
same setting.
2014.09 | V1.2 |
Press the PTT button and Zone 5 button simultaneously for more than 3 seconds, the
Talk LED and Zone 5 LED will flash to indicate this configuration mode.
Press button Zone 5 repeatedly to step through the six different sensitivity settings
sequentially. The Zone 1-3 LEDs show the selected sensitivity (0 = LED off, 1 = LED on).
Press the PTT button to store the selected sensitivity and exit.
Press the PTT button and Zone 2 button simultaneously for more than 3 seconds, the
Talk LED and Zone 2 LED will flash to indicate this configuration mode.
Press button Zone 2 to toggle between a flat frequency response and the filtered
response. The Zone 2 LED shows the selected filter setting (0 = LED off, 1 = LED on).
Press the PTT button to store the speech filter setting and exit.
Installation and Operating Manual
Zone 3 LED Zone 2 LED
0 0
0 1
0 1
1 0
1 0
1 1
Zone 2 LED Remark
0 Low cut @ 315 Hz (-3 dB), 6 dB/
octave
1
Plena All-in-One System
Zone 1 LED
1
0
1
0
1
0
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