9
ENGLISH
POWER SELECTION
LINK TO 100 V / 70 V CONSTANT VOLTAGE LINE
If this speaker is connected to a 100 V constant voltage line, select its proper
power rate by turning its rotary switch (by using a screw-driver) among the
values 30 – 15 – 7.5 – 3.75 W (100 V).
If speakers are connected to a 70 V line, their power rates will be halved.
OFF position: the speaker is muted.
WARNING: do NOT select the 8 Ω position
(as this may damage both
the speaker and the amplifier)!
N
otes
:
-
The speaker input voltage (Vd) shall correspond to the amplifier output
voltage (Va).
-
The sum of nominal power values (Pd x n) of all speakers connected to the
line shall not exceed the amplifier power (Pa).
30W
OFF
OFF
1.875W
3.75W
3.75W
7.5W
7.5W
15W
100V
70V
15W
8Ω
8Ω
LOW IMPEDANCE CONNECTION
Turn the power switch to the 8 Ω position.
Notes:
-
The total speaker impedance must not be lower than the amplifier output
impedance.
-
A speaker total impedance equal to the amplifier 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 amplifier maximum
deliverable power.
-
The speaker line 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).
AMPLIFIER
Pa = Amplifier power
Pd = Speaker power
n = Number of speakers
Vd = Speaker input voltage
Va = Amplifier output voltage
Pa > Pd x n
Va
Vd = va
Vd = va
Vd = va
