McIntosh C20 Instruction Manual page 15

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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