Fender SR-8520PD User Manual
Page 12
FIGURE 2
*Example- The length of speaker wire
required is between 25 and 50 feet
and the speaker impedance is 8
ohms. The minimum recommended
gauge speaker wire is 16 gauge.
100'-UP
8
10 12 14
50'-100'
10 12 14 16
*25'-50'
12 14 *16 18
10'-25'
14 16 18 18
0'-10'
16 18 18 18
2
Ω
4
Ω
*8
Ω
16
Ω
Speaker Impedance
Speaker Wire Length
FIGURE 3
1.8 3.2 5.3
8
1.6 2.7
4
5.3
1.3
2 2.7* 3.2
1
1.3 1.6 1.8
Cabinet A Impedance
Cabinet B Impedance
16
Ω
8
Ω
4
Ω
*
2
Ω
2
Ω
4
Ω
8
Ω
* 16
Ω
CHART A
Parallel
Impedance
*Example- Cabinet A is 8 ohms.
Cabinet B is 4 ohms. The total
impedance when connected in
parallel is = 1 = 2.7 ohms
1
8
1
4
+
2
n
1
1
1
Z
1
Z
1
Z
...
+
Zp=
18 20* 24 32
10 12 16 24
6
8
12 20
4
6
10 18
Cabinet A Impedance
Cabinet B Impedance
16
Ω
*
8
Ω
4
Ω
2
Ω
2
Ω
4
Ω
* 8
Ω
16
Ω
CHART B
Series
Impedance
*Example- Cabinet A is 4
ohms. Cabinet B is 16 ohms.
The total impedance when
connected in series is 4 + 16
= 20 ohms.
2
n
1 Z
Z
Z
...
+
Zs=
FIGURE 4
PIN 1
PIN 2
PIN 3
PIN 1
PIN 2
PIN 3
SWITCHCRAFT
S3FM
22K
30dB PAD
22K
150
OHM
680
OHM
FEMALE
(to microphone)
MALE
(to mixer)
ALL RESITORS ARE 5%
1/4 WATT
+
-
+
-
+ -
+
-
+
-
+ -
A
B
B
A
Speaker Wire Gage