11
This section contains field wiring guidelines and illustrations for the amplifiers. These diagrams
apply to both the Flex-35 and Flex-50. Wiring of optional NAC Expansion, Class A, and Constant
Supervision NAC (CSNAC) modules is also covered in this section, as well as speaker circuit
wiring distances. Since the Flex amplifiers allow self-backing operation, no wiring is required for
configuring an amplifier for backup operation.
Table 2. Class A (Style Z) Speaker Circuit Wiring Distances for Flex Amplifiers
VRMS
Power
(Watts)
Distance to the Last Speaker (One Way) (Feet/Meters)
Applied Actual
12 AWG
(3.309 mm
2
)
14 AWG
(2.081 mm
2
)
16 AWG
(1.309 mm
2
)
18 AWG
(0.8231 mm
2
)
25 50 25 812 ft. (247 m) 510 ft. (155 m) 340 ft. (104 m) 200 ft. (61 m)
25 40 20 1,015 ft. (309 m) 640 ft. (195 m) 402 ft. (123 m) 252 ft. (77 m)
25 30 15 1,350 ft. (411 m) 850 ft. (259 m) 535 ft. (163 m) 337 ft. (103 m)
25 20 10 2,035 ft. (620 m) 1,250 ft. (381 m) 804 ft. (245 m) 505 ft. (154 m)
25 10 5 4,070 ft. (1,241 m) 2,600 ft. (792 m) 1,600 ft. (488 m) 1,012 ft. (308 m)
70 50 25 6,500 ft. (1,981 m) 4,096 ft. (1,248 m) 2,578 ft. (786 m) 1,620 ft. (494 m)
70 40 20 8,121 ft. (2,475 m) 5,108 ft. (1,557 m) 3,212 ft. (979 m) 2,020 ft. (616 m)
70 30 15 10,860 ft. (3,310 m) 6,800 ft. (2,073 m) 4,270 ft. (1,301 m) 2,689 ft. (820 m)
70 20 10
16,212 ft. (4,941 m) 10,190 ft. (3,106 m) 6,400 ft. (1,951 m) 4,030 ft. (1,228 m)
70 10 5
32,400 ft. (9,876 m) 20,000 ft. (6,096 m) 12,500 ft. (3,810 m) 8,000 ft. (2,438 m)
Table 3. Class B (Style Y) Speaker Circuit Wiring Distances for Flex Amplifiers
VRMS
Power
(Watts)
Distance to the Last Speaker (One Way) (Feet/Meters)
Applied Actual
12 AWG
(3.309 mm
2
)
14 AWG
(2.081 mm
2
)
16 AWG
(1.309 mm
2
)
18 AWG
(0.8231 mm
2
)
25 50 25 1,624 ft. (495 m) 1,021 ft. (311 m) 680 ft. (207 m) 400 ft. (122 m)
25 40 20 2,033 ft. (620 m) 1,279 ft. (390 m) 804 ft. (245 m) 505 ft. (154 m)
25 30 15 2,707 ft. (825 m) 1,704 ft. (519 m) 1,070 ft. (326 m) 673 ft. (205 m)
25 20 10 4,067 ft. (1,240 m) 2,558 ft. (780 m) 1,608 ft. (490 m) 1,011 ft. (308 m)
25 10 5 8,140 ft. (2,481 m) 5,120 ft. (1,561 m) 3,219 ft. (981 m) 2,024 ft. (617 m)
70 50 25 13,000 ft. (3,962 m) 8,197 ft. (2,498 m) 5,154 ft. (1,571 m) 3,241 ft. (988 m)
70 40 20
16,243 ft. (4,951 m) 10,216 ft. (3,114 m) 6,424 ft. (1,958 m) 4,040 ft. (1,231 m)
70 30 15
21,721 ft. (6,621 m) 13,602 ft. (4,146 m) 8,553 ft. (2,607 m) 5,379 ft. (1,640 m)
70 20 10
32,424 ft. (9,883 m) 20,394 ft. (6,216 m) 12,823 ft. (3,908 m) 8,065 ft. (2,458 m)
70 10 5
64,800 ft. (19,751 m) 40,000 ft. (12,192 m) 25,000 ft. (7,620 m) 16,000 ft. (4,877 m)
Amplifier Field Wiring
Overview
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General