Page 12
CP660 Six Channel Amplifier
Reference Manual
3.3.4 Additional Load Protection
The
CP660
amplifier can generate substantial power
output. If your loudspeakers do not have built-in protec-
tion from excessive power, it’s a good idea to protect
them. Loudspeakers are subject to thermal damage
from sustained overpowering and mechanical damage
from large transient voltages. In both cases, special
fuses may be used to protect your loudspeakers.
7. If the size of the cable exceeds what you want to use,
(1) find a way to use shorter cables, (2) settle for a
lower damping factor, or (3) use more than one cable
for each line. Options 1 and 2 will require the substitu-
tion of new values for cable length or damping factor in
the nomograph. For option 3, estimate the effective
wire gauge by subtracting 3 from the apparent wire
gauge every time the number of conductors of equal
gauge is doubled. So, if #10 wire is too large, two #13
wires can be substituted, or four #16 wires can be
used for the same effect.
Fig. 3.4 Wire Size Nomograph
40
30
20
15
10
9
8
7
6
5
4
3
2
1
2
5
10
20
50
100
.04
.06
.1
.2
.4
.6
1
2
4
6
10
20
40
5
10
20
50
1
2
100
200
500
1000
2000
5000
8000
5000
1000
500
100
50
10
5
1
.5
.1
.05
.01
#28
#26
#24
#22
#20
#18
#16
#14
#12
#10
#8
#6
#4
#2
#0
#00
#0000
R
LOAD
RESISTANCE
(ohms)
L
R
R
DAMPING
FACTOR
L
S
R
SOURCE
RESISTANCE
(ohms)
S
2-COND.
CABLE
(feet)
ANNEALED
COPPER
WIRE
(AWG)
(ohms/1000 ft.)
Example Shown:
R = 8 ohms; R = 0.016 ohms or D.F. = 500;
Cable Length = 10 ft.; answer: #8 wire
L
S
1
0.5
200
500
1,000
2,000
20,000
5,000
10,000
.01
.001
.02
.004
.006
.002
.0004
.0006
.0002
0.6
0.7
0.8
1.5
0.9
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