CAS 4040 - Volume Control; Balance Control; Treble Tone Control (CAS 4040); Bass Tone Control (CAS 4040)

11
.
Headphone
Socket
This
is
a
standard
Vi
"
jack
socket
for
use
with
low
impedance
headphones
.
When
the
loudspeakers
are
connected
to
the
switched
output
terminals
at
the
rear
,
inserting
the
headphones
will
automatically
disconnect
the
speakers
.
Check
the
rear
panel
details
for
further
information
(
section
3
)
.
12
.
&
13
.
Power
ON
/
OFF
&
LED
indicator
This
is
the
mains
ON
/
OFF
switch
,
with
a
mains
fuse
fixed
to
the
rear
panel
.
When
the
power
is
on
,
the
LED
will
light
.
8
.
Balance
This
passive
channel
balance
control
differentially
alters
the
gain
of
the
left
and
right
channels
.
It
maintains
full
output
whilst
in
the
middle
and
reduces
the
gain
on
one
channel
whilst
increasing
it
on
the
other
.
If
it
is
necessary
to
set
the
balance
control
more
than
a
few
degrees
from
its
centre
position
,
then
you
should
check
your
signal
source
and
loudspeakers
for
problems
.
9
.
Treble
CAS
4040
only
Both
tone
controls
are
designed
to
be
useful
rather
than
dramatic
.
The
treble
control
has
a
frequency
'
hinge
'
point
at
a
much
higher
frequency
than
conventional
circuitry
(
7
kHz
)
.
This
means
that
the
loss
of
attack
or
presence
in
a
recording
can
be
restored
or
merely
improved
without
annoying
phase
alterations
at
the
human
ear
'
s
most
sensitive
frequency
range
between
500
Hz
and
3
kHz
.
The
control
is
of
a
Baxendall
type
with
both
lift
and
cut
.
10
.
Bass
CAS
4040
only
This
control
operates
in
a
similar
way
to
the
treble
control
but
its
hinge
point
starts
at
about
60
Hz
and
raises
with
control
rotation
to
approximately
120
Hz
.
Again
,
this
is
more
functional
than
dramatic
,
and
has
the
advantage
of
adding
another
octave
of
bass
extension
to
smaller
speakers
without
colouring
the
higher
frequencies
.