10
ENGLISH
CONNECTIONS
In order to prevent the risk of electric shock, assure the amplifier is switched
off (before connecting the loudspeaker).
Notes:
To ensure a correct musical reproduction, loudspeaker phase is to
be respected (loudspeakers are connected respecting the amplifier
polarity). This is important when loudspeakers are installed adjacent one
another, for instance, in the same room. Use bipolar cables that have
markings to distinguish the polarity (e.g. insulation of different colours,
conductors of different colours, etc.).
To prevent inductive effects from causing hum, noise and a bad system
working, loudspeaker lines should not be laid together with other electric
cables (mains), microphone or line level signal cables connected to
amplifier inputs.
The loudspeaker cable shall have wires with a suitable section (twisted, if
possible, to reduce inductive effects due to surrounding electro-magnetic
fields) and a sufficient electrical insulation. 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.
Connect the amplifier po output to the white wire of
the loudspeaker cable.
Connect the amplifier negative – output to the black wire
of the loudspeaker cable.
Before turning the amplifier on, check the connections again.
NOTES ABOUT LOW IMPEDANCE CONNECTIONS
The total loudspeaker impedance must not be lower than the amplifier
output impedance. Note: a loudspeaker total impedance equal to the
amplifier output one permits to get the maximum deliverable power (but
an higher loudspeaker impedance entails less power).
The total loudspeaker power shall be adequate for the maximum
deliverable power of the amplifier.
The loudspeaker line shall be short (for long distances, it may be
necessary to use cables with large cross-section wires).
The impedance of a single DM 41-B16 is 16 Ω; the total impedance of
the parallel of 2 loudspeakers is 8 Ω (impedance = 16 / loudspeaker
number).
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