You
may now start
to enjoy
the rnarvelous
instrurnent which you own.
To
give you
sorrre
farniliarity with its
complete
design
and
flexibility
here
are sorne of the things it
will
do for
you.
l.
If
the recording has been rnade with
left
or right distribution of instrurnents reversed,
you
rnay
correct
it by
changing
the
"MODE"
selector frorn
"STEREOil
to
"REVERSE. "
You
will fi.nd
sorne stereo
records
that sound
better played
in
Stereo Reverse
because in this
posi-
tion the
I'MODErr
selector
returns
the left-right distribution to norrnal.
Z.
If
the sound is louder on
the
left
than
on
the
right,
adjust the
"BALANCEI'control
to
the right to bring the sound into
r'left
to
right" balance.
If
the sound is louder on the right,
correct it by turning the'TBALANCETT
control
to
the
left.
You
will find records where
the
bal-
ance setting differs frorn other records.
If after
balancing your
systerr. as outlined in this manual
you
then find
that nearly all
re-
cords
always require
an adjustrnent
of
the
I'BALANCE"
control
to one side of
the center, the
condition
indicates an
unbalanced stereo cartridge.
While
this is no
great
disadvantage
as
such, you
can correct
for it by offsetting one of the
power
arnplifier
input
gain
settings.
When
switching frorn
I'STEREO"
to
"REVERSEil
you
will
now experience
a
change
in volurne as
a
re-
sult of
this
correction.
3.
If the stereo sound seerns to
corne
frorn
either side of
the
room instead
of being distri-
buted between
the
loudspeakers,
adjust the
"PHASEil
control to
I80o.
This listening
effect
is
due to reproducing sound that is out of
phase
frorn one
channel
to the other.
You
will find
some
records
differ from others in this respect
and that sorne tapes differ frorn records.
4.
If
you
wish to reproduce ota, Uaaty worn
record.s, you rnay rninimi ze
tle surface
noise
by
switching the
I'H.
F.
CUTOFF
FILTERil to
9
KC
or
5
KC.
5..
If
you
are using a turntable
or
changer which has a low frequency rumble
noise,
you
rnay reduce
this
problern
by operating the
'TRUMBLE
tr'ILTER"
push
button in
the
"IN"
position.
Undesirable
acoustic
coupling
in the
very low
frequency
bass range rnay
also be reduced by
this
procedure.
6.
Music
reproduced
at very low volurne loses its bass
and treble due
to a selective shift
in sensitivity
of the hurnan hearing.
The
farnily of
curves
on a
graph
showing this effect
are
known
as Fletcher-Munson
curves. The
loudness
control on the
C-20
corrects for this
effect
.
'When
you wish
to hear rnusic at
greatly
reduced
loudness and yet hear
bass and treble
then turn
the
'TLOUDNESSil
control, to
reduce
intensity, rather
than the volurne
control.
Sorne
users of
C-20's
like to leave
the
"LOUDNESS|t
control at
positions
I or 2
to
correct
for
environrnental
conditions such as loudspeaker
characteristics or roorn placement,
etc.
7.
If
you wish
to
Iisten
to
rnonophonic
records,
switch the input
selector
to'TPHONO I
MI
or
ITPHONO
Z
M".
Vertical
output frorn
stereo
cartridges
is
cancelled
by operating
the input
selector to the'rM'r(rnonophonic) positions.
When
listening
to rnonophonic
records
vertical out-
put
consists only of undesirable sounds
such as record scratch.
8.
The tone balance which you hear
when listening
to an orchestra
is affected by
the
con-
ductorrs instructions
to his rnusicians,
the acoustic
environrnent in which
you
are
listening
and
your
own subjective hearing interpretation.
When
you realize
that
tone balance
will vary
even
with
the roolrr or haII location from which
you listen
to music it
is not difficult
to understand
why
tone balance
controls
play
a necessary part in
correcting
for
the following
factors:
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L4-
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