Amplifier Outputs - Bosch PRAESENSA Manual
Public address and voice alarm system
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PRAESENSA
3.5.7
Amplifier outputs
The amplifier provides eight output channels and a spare channel that substitutes a failing
channel.
The channels have direct drive 70/100 V outputs for low distortion, low crosstalk and a wide
audio bandwidth. There are no output transformers that would be a limiting factor for the
output power of each channel. Every channel also has a load independent flat frequency
response. This combination of features makes it possible to partition the available amplifier
power across all channels and utilize that power effectively.
Every channel has a 4‑pole connector socket, providing independently switched loudspeaker
group A and group B outputs. The two outputs can be used for single Class A, single Class B
or dual Class B field wiring.
Caution!
Amplifier outputs may carry output voltages up to 100 VRMS. Touching uninsulated terminals
!
or wiring may result in an unpleasant sensation.
Notice!
i
UL notifications
For proper supervision, do not loop wire under terminals. Break the wire run to provide
supervision of connections.
Three different loudspeaker connection topologies are supported, configurable in the system
configuration:
Single Class B wiring
Figure 3.7: Single Class B wiring
If no loudspeaker line redundancy is needed for a zone, then follow the procedure below to
connect the loudspeakers to output A only:
Bosch Security Systems B.V.
Underwriters Laboratories Listing Document (ULLD)
Installation wiring | en
(EOL-US)
2021.12.21 | V0.15b | F.01U.402.882
51
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