Connections; Connecting Inputs; Priority Microphone (Input 1); Additional Microphones (Inputs 2 And 3) - Bosch PLENA Series Operation Manual

12 en | Connections
5

Connections

5.1

Connecting inputs

5.1.1

Priority microphone (input 1)

The priority microphone (or a generic call station) that can be used with push to talk (PTT)
should be connected to microphone/line 1 input. The PTT mode can be activated by setting
the DIP switch (3) at the rear of the unit. Microphone/line 1 input has priority over all other
microphone and music inputs.
If, however, the telephone / 100V emergency input receives a signal, all inputs including
microphone/line 1 input will be overridden.
The microphone/line 1 input has a 5-pin Euro style pluggable screw terminal connector, the
first 3 pins for a balanced mic/line input, the remaining 2 pins for a trigger input. If these two
pins are not connected, this input will be mixed with other inputs without priority.
Set the DIP switch settings next to the Euro connector for microphone/line 1, as required. See
Unit settings, page 14.
Notice!
When connecting an unbalanced line level (200 mV) signal to the microphone/line input,
connect it as follows: Signal to pin 2, pin 1 and pin 3 to ground.
5.1.2

Additional microphones (inputs 2 and 3)

Additional microphones can be connected to microphone input 2 and 3 with XLR or TRS type
connectors. These microphones will mix with the background music. Phantom power can be
switched on to provide power to condenser microphones.
The telephone / 100V emergency input and microphone/line input 1 have priority over
microphone inputs 2 and 3.
5.1.3

Emergency inputs

The telephone / 100V emergency input is used for receiving emergency announcements from a
Public Address or telephone system. This input has absolute priority, and will override all
inputs when an emergency announcement or telephone signal is received.
Either a telephone line or a 100 V input signal can be connected to the Euro style pluggable
screw terminal connector (2) at the rear of the unit.
To adjust the volume of the emergency announcement or signal, turn the rotary knob (1) at
the rear of the unit. For safety reasons, the volume of the emergency announcement or signal
cannot be set to zero.
The master volume control setting (6) does not influence the volume setting of the emergency
announcement or signal.
2019-03 | V1.1 | Operation manual
PLENA Mixer amplifier, 4-zone, 240W
Bosch Security Systems B.V.