User Manual

7
ENGLISH
LOW IMPEDANCE CONNECTION (8 Ω)
Set the power selector to 8 Ω.
- The total speaker impedance must not be lower than the amplier output
impedance.
- A speaker total impedance equal to the amplier output one permits to get
the maximum deliverable power (but a higher impedance entails less power).
- The total speaker power shall be adequate for the amplier maximum
deliverable power.
- Speaker lines shall be as short as possible (for long distances, it may be necessary
to use cables with large cross-section wires).
- The impedance of a single speaker is 8 Ω. For example, the total impedance of
the parallel of two speakers is 4 Ω (impedance = 8 / speaker number).
POWER SELECTION WHEN LINKED TO 70 / 100 V CONSTANT VOLTAGE LINE
If this speaker is connected to a 70 / 100 V constant voltage line, select its
proper power rate by turning its power selector (with a screw-driver) among
the values 40 – 20 – 10 – 5 W (100 V) or 40 – 20 – 10 – 5 – 2.5 W (70 V).
WARNING:
- Do NOT select the 8 Ω position
(as this may damage the speaker and the amplier)!
- Do NOT select the 40 W – 70 V position
when linked to a 100 V line!
AMPLIFIER
Pa = Amplier power
Pd = Speaker power
n = Number of speakers
Vd = Speaker input voltage
Va = Amplier output voltage
Pa > Pd x n Va
Vd = va Vd = va Vd = va
NOTES ABOUT 70 / 100 V CONSTANT VOLTAGE LINES
- The speaker input voltage (Vd) shall correspond to the amplier output
voltage (Va).
- The sum of nominal power values (Pd x n) of all speakers connected to the line
shall not exceed the amplier power (Pa).
8
40W
NC
20W
40W
100V
70V
10W
20W
5W
10W
2.5W
5W
Ω
8
40W
NC
20W
40W
100V
70V
10W
20W
5W
10W
2.5W
5W
Ω