Manual

16
ENGLISH
INPUT CABLES
For connecting the speaker use cables with an adequate cross-section.
The greater the distance between the amplifier and the speaker, the larger
the connection cable cross-section should be to limit the voltage loss along
the line. To prevent inductive phenomena from giving rise to humming or
disturbance that jeopardize the effective operation of the audio system, the
speaker cables should not be run together with electrical energy conductors,
microphone cables, or low level audio lines (e.g. LINE level).
To facilitate the ‘’in phase’’ connection of the speaker, use bipolar cables that
have markings to distinguish the polarity (e.g. insulation of different colours,
conductors of different colours, ect.).
To minimize the inductive effects (hum) due to coupling with surrounding
electrical fields, use cables with conductors braided together.
Pa = Amplifier power
Pd = Speaker power
n = Number of speakers
Vd = Speaker input voltage
Va = Amplifier output voltage
Amplifier
Pa > Pd x n Va
Vd = Va
+
-
-
+
-
+
Vd = Va
Fig. 2
-
+
Vd = Va
• The input voltage selected on the speaker must correspond with the
voltage selected on the amplifier.
• The sum of the operating power values of all the speakers connected to
the audio line must not exceed that of the amplifier.
• To ensure correct audio reproduction, the connections should be made “in
phase”, where the +/- polarities of the amplifier output correspond with the
+/- polarities of the speaker input.
When two speakers reproduce the same frequencies but with phase
differences, these frequencies may be annulled. In sound systems, speakers
are often situated in adjacent positions and the sound waves produced
interact with each other. If a speaker is connected incorrectly; i.e. the polarity
of the audio line conductors is inverted, the audio signals are transmitted with
differences in phase and correct reproduction is therefore jeopardized.