FLX-E Operations Manual Rev F
Page 26
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11
Appendix A—Maximum Speaker Cable Length Tables
Because speaker wires have a finite resistance per unit length, long cables will affect SPL. This is more
important for low impedance speakers, since a few tenths of Ohms corresponds to a larger fraction of the
speaker impedance, but should still be considered for high impedance systems.
The following tables can be used as a rule-of-thumb to determine the maximum speaker cable length (in
feet) for various systems. First, consult the appropriate table for the type of system; low impedance, 25V,
70.7V or 100V. Find the column corresponding to the average power level to be delivered to the speakers.
(For 25V, 70.7V and 100V systems, the tables assume the entire load is located at the maximum distance.)
Scan down the column until you reach the required cable length, and scan across to find the appropriate
wire gauge. This will result in an approximately 0.5dB loss in SPL.
4Ω, 8Ω and16Ω Speaker Lines (length in feet)
Wire gauge
4Ω Speaker load
(W)
8Ω Speaker load
(W)
16Ω Speaker load
(W)
10
120
240
480
12
75
150
300
14
50
100
200
16
30
60
120
18
20
40
80
20
12.5
25
50
22
8
16
32
25V Speaker Line (length in feet)
Wire
gauge
7.5W
Load
15W
Load
30W
Load
60W
Load
100W
Load
125W
Load
250W
Load
400W
Load
500W
Load
10
2500
1250
625
313
188
138
69
46
34
12
1550
775
388
194
118
94
47
29
23
14
950
475
238
119
75
56
28
18
14
16
600
300
150
75
46
36
18
11
X
18
375
188
94
47
29
23
11
X
X
20
240
120
60
30
19
14
X
X
X
22
150
75
38
19
12
X
X
X
X
