McIntosh MC 502, Руководство пользователя

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How to Connect
INPUT
STEREO OR TWIN AMPLIFIER OPERATION
Use shielded cables to connect the signal from
the preamplifier or signal source to the power
amplifier input. To minimize the possibility of hum
the shielded cables should be run parallel to each
other or loosely twisted together. Locate the cables
away from speaker leads and AC power cords. All
connections are made on the back panel of the MC
502.
For stereo operation, the left output of the
preamplifier should be plugged into the Left input
jack of the power amplifier. The right output of the
preamplifier should be plugged into the Right
(MONO) input jack of the power amplifier.
MONOPHONIC OR SINGLE CHANNEL OPERATION
A shielded cable from the signal source is plug-
ged into the Right (MONO) input jack of the MC 502
only. The MODE SWITCH on the back panel of the
amplifier must be placed in the MONO position. In
the MONO position the right channel input jack con-
nects to both amplifiers. The Left INPUT is discon-
nected.
OUTPUT
Selection of the proper gauge wire to connect the
loudspeakers preserves the quality of sound repro-
duction for which the loudspeakers have been de-
signed. If undersize wire is used, resistance is added
to the amplifier/loudspeaker combination which
adversely affects the performance. Added resis-
tance causes reduction of damping characteristics,
modification of frequency response and reduction in
power output.
Use lamp cord, bell wire, or wire with similar type
of insulation to connect the speakers to the ampli-
fier. In all cases, the leads to and from the speaker
should be twin conductor or twisted together. When
using 8 ohm speakers and for the normally short dis-
tances of under 30 feet between the amplifier and
speaker, No. 18 wire or larger can be used. For
distances over 30 feet between the amplifier and
speaker use larger diameter wire. Select the correct
size wire for the wire length from the chart. It is
recommended that the DC resistance of the speaker
leads be less than 5% of the speaker impedance. Up
to 10% can be tolerated. Resistance of the leads
should be computed for the length of wire both to
and from the speaker or speakers.
Wire
Gauge
22
20
18
16
14
12
10
MAXIMUM WIRE LENGTHS
For 4 Ohm Load
Feet
6
10
15
25
40
60
100
Meters
1.8
3.1
4.6
7.6
12.2
18.3
30.5
For 8 Ohm Load
Feet
12
20
30
50
80
120
200
Meters
3.7
6.1
9.1
15.2
24.4
36.6
66.0
Wire lengths above represent the wire resistance equal to 5%
of the speaker impedance.
For multiple speaker operation, run separate
leads from the amplifier to the speakers.
CONNECTING LOUDSPEAKERS FOR STEREO
Connect the leads from the left loudspeaker to the
Left and Common OUTPUT terminals on the MC 502.
Connect the leads from the right main loudspeaker
to the Right and Common terminals.
CONNECTING ONE LOUDSPEAKER FOR MONO
Connect leads from the loudspeaker to the Left
and Right OUTPUT terminals on the MC 502. Check
to be sure the MODE switch is in the MONO posi-
tion.
In MONO operation neither output terminal (Left
or Right) is at ground potential. The output is balanc-
ed to ground. Due precaution is required when con-
necting test instruments since neither terminal can
be grounded.
AC POWER
The amplifier AC power cord is plugged into a 120
volt 50/60 Hz wall outlet.
FUSE
A 4-amp fuse protects the MC 502 circuits. The
fuse does not protect additional equipment con-
nected to the rear panel AC power outlets.
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