Specifications

1.
Hi-Fidelity
sound
because...
Sound
heads,
amplifier,
loudspeaker
and
mechanical
components
were
designed
for
each
other
as
a unit,
according
to
the
most
exacting
specifications.
Exceltent
sound
quality
is
due
to absolirtely
coRstant
film
movement
assured
by two
massive,
perfectly
balanced
flywheels.
a)
Optical
sound
head.
lts
careful
design
yields
a faithful
reproduction
of music,
voice
and
sound
effects.
-
Frequency
range:
50 to
7,000
c/s
r
3 db.
-
High
precision
scanner.
-
Standard
4
V 0.75
amp.
exciter
lamp fed
by 40,0O0
c/s high
f requency
current,
which
eliminates
hum. The
lamp
is
precentered
and
easy to
change.
-
Large
ph.cto-electric
cell
with
elastic
suspension,
shielded
against
microphonic
effects.
-
Focusing
knob
keeps
scanner
beam
at maximum
efficiency.
regardless
of
whether
emulsion
or
base
side
of film
faces
sound
head.
-
Scanner
shielded
against
stray light
from
valves
and
other
light
sources.
b)
Amplifier.
Of sturdy
construction,
it
was
de-
signed
specially
with
the
use of
a sound
projector
in
mind
(choice
of
first
class materials,
modern
valves,
silicium
rectifiers).
The
wiring
has
to
undergo
careful
testing
and
the
performances
are measured
to
meet exact
specifications.
-
Frequency
range:
30-16,000
c/s,
+
1
db.
Audio
power
output : 15
watts,
sufficient
even
for
large
auditoriums
;
audio
power
output
3
% distorsion
:
12
watts.
-
Voltage
selector.
-
Two
high impedance
inputs
: 1)
for
microphone
;
2) for
record-player,
tape
recorder
or radio.
-
Two independant
input
channel
controls
for
mixing
and transitional
fades.
-
Two
output
channels
: 1
)
for loudspeaker
(6
ohms)
;2)
tor
earphones
(50
ohms).
-
Use
of the amplifier
as
"Public
Address"
system. Used
in
conjunction with
a microphone,
record-player
or
tape,recorder
the
amplifier-
loudspeaker
system
can also
serve
as a
public
address
system.
-
During
proiection
: to add
commentary,
back-
ground
music
and
sound elfects
to a
silent film,
or to
accompany
the
music track
of
a lilm
with
live
narration
:
-
Without projection
:
as
a
public
address
system.
c) Built-in
loudspeaker.
Permanently
fitted into
the
projector
cover.
-Output:6watts.
-
Diameter:8inch.
-
Supplied with
50 foot
cable.
Magnetic
sound features
of the
5-221
pro-
iector
are described
on
page
1
0
"Additional
Specif icati
on...".
Volume
control.
Tone
control
for
bass
and treble
respectively
(response
characteristic
can thus
be
varied
de-
pending
on the
acoustical
characteristics
of the
room
where
projection
takes
place).
Checking
the sound
quality
of an 5-221
projector
electronically.