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Switching on amplifier
Switch on amplifier by means of
masterswitch
a (Fig
.
2 a).
The
amplifier
is ready
for service after a warm-up period of
approx.
30 sec
.
Fig
.
8 Portable loud
speaker
Fig
.
9 20-
w
att loudspeaker combination
Loudspeaker connection
Connect loudspeaker to amplifier output p
(Fig. 2 b).
For
sound
film projection in
very
large rooms with poor acoustic
conditions,
the
20-watt
loudspeaker
combination
SI. L
6.4 (Fig.
9)
should
be used. The units
should
be placed
side
by
side
and angled for
any
desired direction of projec-
tion, or located
separately
at each
side
of the projection screen for
sound
projection with
spreading
effect.
For large auditoriums and theatres up to approx. 1,000
seats,
the 15-watt port-
able
loudspeaker SI. L
6.1
(Fig. 8)
should
be
employed,
and for auditoriums and
theatres
of
medium
size
for an audience of up to 700, the tweeter-woofer loud-
speaker system
SI. L
6.2 (Fig. 8) should
be
chosen.
The
connecting
lead is
coiled up
inside the
case.
As
a
nonperforated
projection screen
is
generally used
for 16 mm film in
order
to avoid
loss
of brightness,
the loudspeaker
should be
placed
close
to the
side
of
the
screen and, where
possible, on the
same
level as the
screen.
The
volume can
be increased by opening up rear of loudspeaker
case (Fig. 8)
and
lifting it out
sideways.
The
amplifier
may also be operated in
connection
with a
50-watt
power
stage
and
a loudspeaker array.
11
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