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Operation; Switching On And Off; Microphone Control; Music Control - Bosch PLENA Series Operation Manual

Mixer amplifier, 4-zone, 240w


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PLENA Mixer amplifier, 4-zone, 240W



Switching on and off

To switch on unit, set the power button (1) on the front panel to On - pushed in (see Front
panel, page 9).
To switch off the unit, set the power button (1) on the front panel to Off - popped out (see
Front panel, page 9).

Microphone control

Use the input level control knobs to individually control the sound level of microphone/line
input 1 and microphone inputs 2 and 3.
Users can create custom labels for the microphone and microphone/line inputs, description
of the music sources, and audio output zones 1 to 4. These labels can be attached to the
mixer amplifier at position numbers 2, 3, and 5 (see Front panel, page 9).
Colored pins can also be inserted at various positions around the control knobs to indicate
the favorite settings for a particular application.

Music control


Source selection

Use the music source selector (9) to select one of the connected music sources. The selected
source will be indicated by a green LED.
The music input selected is stored in the unit. Therefore, it is not necessary to repeat the
selection after restart.

Volume control

Use the music source volume control knob (11) to control the sound level of the selected
music source.

Tone control

The tone control knobs provide separate control of high frequency (treble) and low (bass)
frequency audio for the mixed input of mic/line and music.
The tone controls are not standard bass and treble controls: they can be used as a traditional
tone control with high and low control, but also have a powerful contour that addresses
problems found in real situations.
The tone control boosts warmth in voices and deep bass without boosting rumble, and cuts
rumble without losing warmth or making the sound boomy in the low frequencies. In the high
frequencies, the tone control boosts sparkle without adding sharpness, but when cutting is
first, cuts harshness and sharpness without reducing audio clarity.
Use the Hi (high) and Lo (low) tone control knobs (see Front panel, page 9, numbers 4 and 12)
to change the tone of the mixed output.

Output control


Zone selection

Use the zone selection buttons (13 to 16) to route the music/microphone, line mix from the
amplifier output to loudspeaker zone 1, 2, 3 and/or 4.
Bosch Security Systems B.V.
Operation manual
Operation | en
2019-03 | V1.1 |


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