PRAESENSA Amplifier, 600W 8-channel | PRA-AD608 | en 83
Bosch Security Systems B.V. Installation manual 2019.11 | V1.00 |
Fault tolerance
– Dual OMNEO network connections, supporting Rapid Spanning Tree Protocol (RSTP), for
loop-through connections to adjacent devices.
– Dual 48VDC inputs with polarity reversal protection, each with a full power DC/DC
converter, operating in tandem for redundancy.
– Fully independent amplifier channels; the integrated spare channel automatically replaces
a failing channel, with due regard of the actual sound processing settings.
– All amplifier channels support two independent loudspeaker groups, A and B, enabling
redundant loudspeaker wiring topologies.
– Backup analog audio lifeline input driving the spare amplifier channel to serve all
connected loudspeaker zones in case both network connections, or the amplifier network
interface, would fail.
9.3 Functional diagram
Functional and connection diagram Internal device functions
1 A
1 B
2 A
2 B
3 A
3 B
4 A
4 B
5 A
5 B
6 A
6 B
7 A
7 B
8 A
8 B
1
2
3
4
5
6
7
8
A
B
2
1
DC to DC converter
Audio processing (DSP)
OMNEO network switch
Controller
Lifeline control interface
Lifeline supply input
Lifeline audio input
1-8 Amplifier channel
Spare channel
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