Centralized audio applications
4.2 EST3 Installation and Service Manual
Equipment required
The EST3 system requires one 3-ZA20 amplifier for each audio
channel to be operated simultaneously. The output of each
amplifier is reduced from 25 Vrms to the appropriate input level
(1 Vrms) using the 3-ATPINT interface, and then fed into the
input of the banked amplifiers.
The wiring between the output of each 3-ZA20 and its associated
amplifier bank input should be twisted, shielded pair, and can be
configured for Class A or Class B integrity monitoring.
The output of the banked amplifiers (the audio riser) is directed
to the appropriate areas using Signature Series modules. The
SIGA-CC1 module, Figure 4-16, is used for single channel
systems and the SIGA-CC2 module, Figure 4-17, is used for two
channel systems.
EST3 audio system programming requires that the Signature
modules controlling the audio signals be programmed in addition
to the programming required for the 3-ZAxx amplifier(s)
supplying the audio signal.
Note: Remember to follow power-limited or nonpower-limited
wiring practices as determined by the amplifier providing the
audio signal.
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