McIntosh MC 7300 User Manual

^
The
McIntosh
output
circuit,
superior
in
its
performance,
demands
a
superior
method
of
coupling
the
amplifier
output
to
the
loudspeaker
load.
The
MC
7300
incorporates
McIntosh
designed
and
manufactured
Autotransformers
to
insure
peak
performance
and
protection,
as
well
as
outstanding
compatibility
between
amplifier
and
speakers.
The
MC
7300
Output
Autotransformers
have
3
dif-
ferent
output
impedance
taps
for
optimum
matching
to
the
particular
speaker
or
combination
of
speakers
.
being
used.
Use
the
following
table
to
determine
which
tap
should
be
used.
It
may
be
desirable
to
consult
your
dealer,
or
the
manufacturer
of
your
.
Speaker
for
the
best
impedance
tap
to
use.
SPEAKER
IMPEDANCE
AMPLIFIER
OUTPUT
IN
OHMS
CONNECTIONS
1.6
to
32
Common
and
2
ohm
outputs
3.2
to
6.4
Common
and
4
ohm
outputs
6.4
and
up
Common
and
8
ohm
outputs
Use
high
quality
speaker
cables.
The
total
resistance
of
the
cables
must
be
as
low
as
possible,
so
larger
diameter,
(lower
gauge
number),
cables
are
most
desirable.
The
longer
the
speaker
cable
is,
the
·
lower
the
gauge
number
must
be
to
keep
resistance
Aow.
RECOMMENDATIONS
FOR
SPEAKER
CABLE
LENGTHS
AND
GAUGE
(SIZE)
These
speaker
cable
lengths
represent
a
resistance
equal
to
approximately
5%
of
the
speaker
im-
pedance.
The
cable
sizes
are
the
minimum
that
should
be
used.
If
there
is
a
choice,
the
larger
diameter
cables,
(Lower
gauge
number),
should
be
used.
For
4
Ohm
Load
For
8
Ohm
Load
Wire
Feet
Meters
Feet
Meters
Gauge
15
4.6
30
9.1
18
25
7.6
50
15.2
16
40
12.2
80
24.4
14
60
18.3
120
36.6
12
100
.
30.5
200
61.0
10
“
STEREOPHONIC
OPERATION
Connect
a
cable
from
the
left
speaker
common
ter-
minal
to
the
amplifier
LEFT
OUTPUT
LC
terminal.
Connect
a
cable
from
the
left
speaker
hot
terminal
to
the
amplifier
LEFT
OUTPUT
L
(impedance
tap
desired)
terminal.
Connect
the
right
speaker
in
an
identical
manner
to
the
amplifier
RIGHT
OUTPUT
terminals
of
the
cor-
rect
impedance
for
your
speakers.
If
the
actual
load
impedance
of
a
speaker
is
lower
than
the
specified
impedance,
particularly
at
dif-
ferent
parts
of
the
frequency
range,
it
will
cause
no
problems.
The
high
current
output
capacity
of
the
MC
7300
will
produce
the
extra
current
necessary
to
properly
drive
the
speaker
under
these
conditions.
If
the
impedance
of
the
speaker
is
higher
than
the
8
ohm
tap,
no
change
in
performance
quality
will
occur.
The
available
power
output
will
simply
be
slightly
less.
The
common
and
hot
terminals
of
both
speakers
in
a
stereo
installation
must
be
connected
in
an
identical
manner
to
the
proper
amplifier
output
terminals.
This
is
essential
for
keeping
both
speaker
systems
operating
IN
PHASE.
This
means
that
the
driving
surfaces
of
each
channel
speaker
system
will
move
back
and
forth
together.
Almost
all
speakers
have
their
hot
and
com-
mon
terminals
color
coded,
with
red
usually
as
hot.
BE
SURE
THE
REAR
PANEL
MODE
SWITCH
15
SET
TO
STEREO
The
MC
7300
can
be
used
to
feed
a
constant
voltage
line,
often
used
in
background
music
ap-
plications.
For
a
25
volt
line,
use
the
2
ohm
outputs
on
the
amplifier.
Because
the
crosstalk
between
channels
on
the
MC
7300
is
almost
non
existent,
each
channel
can
be
used
as
a
separate
monophonic
amplifier.
An
exam-
ple
would
be
one
channel
feeding
background
music
to
a
given
area,
and
the
other
channel
used
for
pag-
ing
in
a
different
area.
Е
MONOPHONIC
BRIDGE
OPERATION
The
MC
7300
can
be
used
as
a
single
channel
monophonic
power
amplifier
in
bridge
configuration.
The
two
amplifier
channel
outputs
add
together
in
series
when
used
in
MONO
(BRIDGE).
The
MODE
switch
connects
the
right
channel
inputs
to
both
power
amplifiers,
with
the
phase
of
the
left
channel
inverted
to
get
bridge
operation.
The
speaker
con-
nections,
both
common
and
hot,
should
be
con-
nected
only
to
the
left
and
right
amplifier
output
im-
pedance
taps
as
shown.
The
common
amplifier
out-
put
connections
are
not
used
in
MONO
(BRIDGE)
configuration.
For
example,
the
two
8
ohm
outputs
will
add
together
to
become
16
ohms.
HOW
TO
CONNECT
OUTPUTS
9

McIntosh MC 7300 Specifications

General

Brand	McIntosh
Model	MC 7300
Category	Amplifier
Language	English