10
IN1+
IN1-
IN2+
IN2-
SHLD
SHLD
SHLD
SHLD
A+
A-
A+
A-
A+
A-
B+
B-
B+
B-
B+
B-
EOLR
NAC1
NAC2
NAC3
NAC1
NAC2
NAC3
IN1
IN2
NAC1
NAC2
NAC3
IN1
IN2
SPEAKER
SPEAKER
SPEAKER
CLASS A WIRING
SHIELD
NOTE 1
EOLR
NOTE 1
4100-5116 Expansion Signal Card
4100-1267 Class A Adapter
To Source
NAC(s)
B+
B-
IN1+
IN1-
IN2+
IN2-
B+
B-
B+
B-
B+
B-
SHLD
B+
B-
SHLD
SHLD
SHLD
B+
B-
EOLR
EOLR
EOLR
NAC1
NAC2
NAC3
EOLR
EOLR
SPEAKER
SPEAKER
SPEAKER
EOLR
SPEAKER
SPEAKER
SPEAKER
4081-9008
EOL HARNESS
10 K 1/2 W
4081-9008
EOL HARNESS
10 K 1/2 W
CLASS B WIRING
SHIELD
SHIELD
NOTE 1
NOTE 1
4100-1266 Class B Expander (option)
4100-5116 Expansion Signal Card
To Source
NAC(s)
NOTE 1
NOTE 1
Provide Audio NAC wiring without Constant Supervision as shown in Figure 4.
Figure 4. Audio NAC Wiring (without Constant Supervision)
Continued on next page
Wiring,
Continued
Audio NAC Wiring
(without Constant
Supervision)
1. Leave the 10 K, ½ W resistors (378-030 – brown/black/orange) on the “B+” and “B-” terminals of
unused circuits.
2. All wiring is between 18 AWG (0.8231 mm
2
) (minimum) and 12 AWG (3.309 mm
2
) (maximum).
3. Field wiring is power-limited.
4. Maximum speaker load per NAC is 50 W. Maximum current per NAC is 1.5 A. Maximum number of
speakers per NAC is 100.
5. Shields, when required, are normally connected to 0 V as shown. Alternate shield termination using
earth ground is provided on amplifier chassis.
6. Signal wiring must test free of all grounds.
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