8 Audio AmplifiersAudio Amplifier (AA-120)
The AA-120 Audio Amplifier is capable of backing up one or more
amplifiers on a single channel. In the event of a primary system amplifier
failure, the backup amplifier takes over automatically. Refer to Figures 5
and 9 for connection details.
To connect a Backup Amplifier, perform the following steps:
1. Connect the output labeled “25 Volt Out,” terminal (P6) on the backup
amplifier, to “Backup In,” terminal (P4) of the first amplifier being
backed up.
2. Connect “Backup Out,” terminal (P5) of the amplifier, to “Backup In,”
terminal (P4) of the next amplifier in line to be backed up.
A single backup amplifier may be used to provide single channel backup
of any combination of 25 VRMS AA-120 amplifiers and 70.7 VRMS
AA-120 amplifiers with the T-70 option installed. Refer to the
T-70 Transformer Installation section of this document for installation
information for the T-70 option. The backup amplifier provides backup to
any one amplifier in the group which fails. In the event of multiple
amplifier failures, the failed amplifier wired closest to the backup
amplifier is the only failed amplifier serviced by the backup amplifier.
If the backup amplifier is located in another cabinet away from the
amplifiers it is backing up, and if it needs to be supervised, connect it to
the 4-wire high-level return P8 (1, 2, and 3, shown by the dotted line in
Figure 9) and cut R100 to enable supervision of the high-level audio
output wiring.
Employing a
Backup
Amplifier
Connecting a
Backup
Amplifier
