CONNECTING LOUDSPEAKERS FOR STEREO
All speakers are connected to the push connec-
tors on the rear panel. When stereo speakers have
been connected to the proper push connectors, the
corresponding front panel pushbuttons turn the
speakers on or off.
Selection of the proper guage 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 receiver/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 am-
plifier, 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
distances of under 30 feet between the amplifier and
speaker. No. 18 wire or larger can be used. For
distances over 30 feet between the receiver 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. The heavier gauge
wires may not fit into the holes in the speaker and
receiver terminals. Attach a short piece of lighter
gauge wire and then connect to the terminals.
MAXIMUM WIRE LENGTHS
Wire For 4 Ohm Load For 8 Ohm Load
Gauge
22
20
18
16
14
12
10
Wire lengths above represent the wire resistance equal to 5%
of the speaker impedance
For multiple speaker operation, run separate
leads from the receiver to the speakers.
Connect the leads from the left main loudspeaker
to the SPEAKER 1 Left and Common push connec-
tors. Connect the lead from the right main
Feet
6
10
15
25
40
60
100
Meters
1.8
3.1
4.6
7.6
12.2
18.3
30.5
Feet
12
20
30
50
80
120
200
Meters
3.7
6.1
9.1
15.2
24.4
36.6
66.0
loudspeaker to the SPEAKER I Right and Common
push connectors. Connect the leads from a second
left loudspeaker to the SPEAKER 2 Left and Com-
mon push connectors. Connect the lead from a se-
cond right loudspeaker to the SPEAKER 2 Right and
Common push connectors. Connect the leads from
a third left loudspeaker to the SPEAKER 3 Left and
Common push connectors. Connect the lead from a
third right loudspeaker to the SPEAKER 3 Right and
Common push connectors.
CONNECTING ONE LOUDSPEAKER FOR MONO
The left and right outputs of the MAC 4100 must con-
nect to separate loudspeakers. Do not parallel the
output connections for a single loudspeaker. If the
left and right outputs are connected together ex-
cessive heat is generated in the power amplifiers
which causes damage even though the MODE
SELECTOR pushbutton is in the MONO position. If
you wish to drive a single loudspeaker, put the
MODE SELECTOR in MONO and connect the loud-
speaker to the left or the right speaker push connec-
tors only. It is not necessary to connect a load to the
other channel output.
CONNECTING A MCINTOSH EQUALIZER
On the JUMPER panel, remove the jumpers bet
ween the PREAMP OUT jacks and POWER AMP IN-
put jacks. The environmental equalizer is connected
between these jacks. Standard shield cables con-
nect the PREAMP OUT to the input of the equalizer.
Connect the output of the equalizer to the POWER
AMP INput jack.
CONNECTING OTHER POWER AMPLIFIERS
External power amplifiers may be fed to the MAC
4100 in two ways:
1. Fed from the RECORDER TAPE OUT. The out-
put at this point is not affected by the volume or
equalizing controls of the MAC 4100. Use this output
to drive an amplifier which has its own controls. A
possible use would be to operate an independent
system in a remote location where volume re-
quirements need to be locally controlled.
2. Fed from the AMPLIFIER - PREAMP OUT
jacks. The output at these jacks is affected by the
VOLUME, EQUALIZER, BALANCE, and LOUDNESS
controls. Use this connection to drive an amplifier
without controls of its own. or where the influence of
the controls of the MAC 4100 are wanted on all
loudspeakers.
8
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