An indication of the proportional cable power loss (percentage of the amplifier’s total output
power) can be calculated using the following formula:
where the variables represent:
L
-
cable length in meters
G
-
cable gauge in square millimeters
R
-
DC resistance of the loudspeaker(s) in ohms
This formula is based on the DC resistance in stead of the complex impedance of the
loudspeaker(s). However, the approximation can be used to get a good impression of the
loudspeaker cable power loss. Per loudspeaker impedance a table is shown in tables 3-9 to
3-12 with the proportional power loss, given the loudspeaker cable gauge in square millimeters
and the cable length in meters.
Proportional Power Loss =
100
29.4 * G * R
L
1 +
16
Ω
Cable Gauge (mm
2
)
1.5
2.5
3.0
4.0
6.0
10.0
16.0
Cable
Length
(m)
10
1.4
0.8
0.7
0.5
0.4
0.2
0.1
20
2.8
1.7
1.4
1.1
0.7
0.4
0.3
30
4.1
2.5
2.1
1.6
1.1
0.6
0.4
40
5.4
3.3
2.8
2.1
1.4
0.8
0.5
50
6.6
4.1
3.4
2.6
1.7
1.1
0.7
100
12.4
7.8
6.6
5.0
3.4
2.1
1.3
Table 3-4
Proportional power loss as a function of loudspeaker cable gauge and cable
length (%).
CONNECT
IONS
stage accompany
R
ES 10 USER MANUAL
3-9
