McIntosh C20 - Balancing a Stereo Systern

BALANCING
A STEREO SYSTEM
A
properly
balanced
stereo
system must
be in
phase,
and
each
channel
rnustbeequal
in
loudness, and
sirnilar in
frequency
response, The C-20
has been
designed so that
once pro-
perly balanced the
6ystern
will
rernain in balance
through
all rnodes of operation.
A familiar
recording
either
stereo
or monophonic
should be used for
balancing the stereo
systern.
The
following
procedure
has been
outlined
to assist
you.
l.
Turn the
"INPUT
SELECTOR"
to
"PHONO
I M.
"
Z.
Turn each
"RECORD
COMPENSATOR'|
control to
"RIAA.
"
3. Turn
the
'iBASS"
and
"TREBLE"
controls
to
"O".
4. Turn the
"MODE
SELECTOR"
to
"STEREO.'l
5. Turn
the
"BALANCE"
and
'TPHASE"
controls
to
"O'r.
6. Turn
the
'THIGH
FRECUENCY
CUTOI'F
FILTER"
to
'rFLAT.
"
7. Turn
the
"LOUDNESS'r
control
to
'TFLAT'
"
With the
controls
set as
above a rnonophonic
signal of equal
arnplitude will be fed to
each
side of the
preamplifier.
To
Adjust
for Amplitude
Balance
in the Treble Range.
Rotate
the
"BASS"
tone control
totally
counterclockwise.
The"PHASE"
control rernains
in the
"O"
position. Wtrile the
record is
playing, switch the
"MODE
SELECTOR"between
"L"
and
"R".
Adjust
the control
rnarked
'|GAIN"
on the input
to the power
arnplifier
until the
loud-
speakers
are of equal
loudness.
(When
using the Mclntosh
MC-Z4O
and
connecting
the
C-20
to
the stereo
input
jacks
rnerely
rotate
the
"BALANCE'|
control on the MC-240
untilloudspeakers
are
of
equal
loudness.)
Do not use the C-20
"BALANCE'|
control
for
this
procedue. The
C-20
'TBALANCE"
control
is used to
adjust for
any unbalance in the
source rnaterial, the
phono
cartridge
or
the tape
rnachine.
To
Adjust
for Balance
in the
Bass
Range.
Many
factors
throughout the
sound
reproducing systern can
adversely affect the balance
in
frequency
response.
Loudspeakers
in
particular are prone to be unequal
as a result
of enclo-
sure, placernent
in the
roorn,
etc. Controls
have been
provided
on the
rear panel of the
C-20
to compensate
for these
inequalities in bass
response. The
following outline will assist you
in
achieving balance.
Adjust
the
"TREBLE'r
tone control
to the totally
counterclockwise
position, and the
"BASS'l
tone control
to the extrerne
clockwise
position,
For
an additional
boost,
if desired, the
''RE-
CORD
COMPENSATOR"
control
rnarked
'|BASS"
can
be rotated to the
"TAPE"
position.
(Note
that
the
rnusic will
have unnatural tone
balance
for
this
procedure.
Bass sound
will predorni-
nate. In
some
installations
it rnay be necessary
to
reduce
thevolurne to
prevent acoustic feeti-
back.
)
While
switching
the'TMODE
SELECTOR'r
between'rL'r
and'rR'r listen carefully to the low
frequency
response. Adjust
the controls
on the back
panel marked
"LOW
FREQUENCYTRIM.'I
The
'rLOW
FREQUENCY
TRIM'r
controls
are
independent of the
front panel
tonecontrolsand
-
LZ-