Connections; Connecting The Terminal Strip; Connecting The Line Transformer; Earthing The Speaker - rcf PL70BS Manual De Uso Y De Instalación

5. Connections

WARNING: To prevent the risk of electric
shock, do not connect the speaker with
the amplifier switched on.
Before using the speaker, carefully check that all
the connections have been made correctly to make
sure there are no accidental short circuits that could
cause electrical sparks.
The speaker is factory-set for direct connection to
audio lines at constant voltage of 100 V.
The speaker can be driven by constant voltage
lines at 70 V or 100 V. Speaker connection is compo-
sed of two phases: connecting the terminal strip in
the base, and connecting the line transformer atta-
ched to the loudspeaker.
When making the connections, keep the following
indications in mind (Fig. 5, page 29).
• The input voltage selected on the speaker must
correspond with the voltage selected on the ampli-
fier.
• 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 con-
nections should be made "in phase", where the +/-
polarities of the amplifier output correspond with the
+/- polarities of the speaker input.
A CLOSER LOOK: 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.

Connecting the terminal strip

Connections with the audio line are made using the
two ceramic terminal strips IN and OUT situated insi-
de the base, and can be made even without the pre-
sence of the speaker, which can be installed at a later
time. The IN +/- terminals are used for audio signal
input and the OUT +/- terminals, being directly con-
nected to the corresponding IN +/- terminals, can be
used as an output for connecting an additional
speaker in parallel (Fig. 6, page 29).
1. Run the conductors to be connected through the
two rubber cable guides I (Fig. 6, page 29) on the
base.
2. Connect the IN - conductor of the speaker to the
negative conductor (-) of the audio line input,
which leads from the amplifier terminal marked -,
0, or COM (Fig. 6).
3. Connect the IN + conductor of the speaker to the
positive conductor (+) of the audio input line (Fig.
6).
4. Follow the same logic for connecting the OUT +/-
terminals with the output line used to drive an
additional speaker to be connected in parallel.
A CLOSER LOOK: To facilitate connec-
tions, especially when using particularly
rigid fire protection cables, the ceramic
terminals can be removed from the base by
unscrewing the wing bolt E (Fig. 1, page 27) that
secures the terminal support.

Connecting the line transformer

The line transformer F (Fig. 1, page 27) of the
speaker must be connected to the terminal strip on
the base using the two conductors with FASTON con-
nectors already connected to the terminal strip.
1. Connect the FASTON connector marked COM to
the terminal marked COM on the line transformer
of the speaker (Fig. 7, page 30).
2. Connect the FASTON connector marked TAP to the
terminal of the line transformer marked with the
output power desired and the voltage of the audio
line (Fig. 7). Be careful not to confuse the power
indications referring to the 70 V input voltage
with the power indications referring to the 100 V
input voltage (e.g. 6W/70V with 6W/100V).
VERY IMPORTANT: To avoid damaging
the speaker, never use the terminal of
the transformer marked 6W/70V when
the speaker is supplied with 100 V lines.

Earthing the speaker

1. Run the protective conductor of the local earth
system through one of the rubber cable guides I
(Fig. 6, page 00) on the speaker base.
2. Connect the protective conductor of the local
earth system to the terminal on the base marked
with the earth symbol
3. Tighten the earth screw L (Fig. 7, page 30) of the
speaker, and insert the forked terminal at the end
of the GREEN conductor of the terminal strip under
the washer of the screw.
4. Tighten the earth screw L (Fig. 7).
10
(Fig. 6).