5
Operating Precautions
Make sure the mains voltage is correct and is the same as that printed on the rear of the amplifier. Damage caused
by connecting the amplifier to improper AC voltage is not covered by any warranty.
Note: Always turn off and disconnect the amplifier from mains voltage before making audio connections. Also, as an
extra precaution, have the attenuators turned down during power-up.
It is always a good idea to have the gain controls turned down during power-up to prevent loudspeaker damage if
there is a high signal level at the inputs. Whether you buy or make them, use high-quality connections, input cables
and loudspeaker cables along with proper soldering technique to ensure trouble-free operation. Most intermittent
problems are caused by faulty cables.
Consult the Wire Gauge Chart (below) to determine proper gauges for various load impedances and cable lengths.
Remember that cable impedance robs amplifier power in two ways: power lost directly to resistance (I
2
R loss) and
by raising the total load impedance.
W I R E G A U G E C H A R T
Cable Length
(In Feet)
Stranded Wire Gauge
(AWG)
Power Loss into
8 ohms (%)
Power Loss into
4 ohms (%)
5
18
.79
1.58
16
.50
1.00
14
.31
.62
12
.20
.40
10
.125
.25
10
18
1.58
3.16
16
1.00
2.00
14
.62
1.25
12
.40
.80
10
.25
.50
40
18
8.00
12.60
16
4.00
8.00
14
2.50
5.00
12
1.60
3.20
10
1.00
2.00
8
.625
1.25
80
16
8.00
16.00
14
5.00
10.00
12
3.20
6.40
10
2.00
4.00
Содержание SA 4200
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