ADT Unimode 400 Multi-Net Installation Manual page 128

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Figure 4-27 and Figure 4-28 show speaker wiring using two AA-30s with a backup
AA-30. Table 4-17 lists the inventory for wiring the speakers.
1. Set FFT-7 SW1 for four-wire operation (down position).
2. Mount resistor R470 across P3-4 and P3-5 on the last amplifier (Figure 4-27).
Item
Low level Audio cable
Telephone cable
25-volt Audio cable
Cable
470 ohm resistor
Figure 4-27 shows typical wiring of two AA-30s using one AA-30 as a backup:
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Figure 4-28 shows two simplified block diagrams for using a backup amplifier:
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Supplied with
AA-30, AA-100, AA-120
VTCC-1 package
AA-30, AA-100, AA-120
FFT-7
AMG-1
Table 4-17 Wiring Inventory
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Unimode 400 Installation PN 50710:A 10/22/97
Voice System Configurations
Part Number
75100
75121
75109
75097
R470
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