10
How to Connect
Amplifier should not be connected to another
Loudspeaker.
4. Prepare the Loudspeaker Hookup Cables that
attach to the Amplifier by choosing one of the
methods below:
Bare wire cable ends:
Carefully remove sufficient insulation from the
cable ends, refer to figures 1, 2 & 3. If the cable
is stranded, carefully twist the strands together
as tightly as
possible.
Note: If
desired,
the
twisted
ends can be tinned with solder to keep the
strands together, or attach spade lug and/or
banana connector.
Spade lug or prepared wire connection:
Insert the spade lug connector or prepared sec-
tion of the cable end into the terminal side ac-
cess hole, and tighten the terminal cap until the
cable is firmly clamped into the terminal so the
wires cannot
slip out. Re-
fer to figures
4, 5 & 6.
Banana plug connection:
Insert the banana plug into the hole at the top of
the terminal. Refer to figures A and B.
Note: Banana
Plugs are
for use
in the
United
States
and Canada only.
When making Loudspeaker Connections to the MC75
Caution: The supplied AC Power Cord should not
be connected to the Rear Panel of the
MC75 Tube Power Amplifier until after
the Loudspeaker Connections have been
made. Failure to observe this could result
in Electric Shock. For additional instruc-
tion on making Loudspeaker Connections
contact your McIntosh Dealer or McIn-
tosh Technical Support.
1. For Remote Power Control, connect a power control
cable from the Control Center or Preamplifier
Power Control Out to the MC75 POWER CON-
TROL IN.
2. Connect a cable from the Balanced Output of a
McIntosh Preamplifier or Control Center to the
MC75 BALANCED INPUT. Place the INPUT
MODE Switch in the BALANCED Position.
Note: An optional hookup is to use an unbalanced
cable and place the INPUT MODE Switch in
the UNBALANCED Position.
When connecting Loudspeakers to the MC75 it is very
important to use cables of adequate size, so there is
little to no power loss in the cables. The size is speci-
fied in Gauge Numbers or AWG (American Wire
Gauge). The smaller the Gauge number, the larger the
wire size:
3. This McIntosh MC75 Tube Power Amplifier is de-
signed for the connection of a single Loudspeaker
with an impedance of 2 ohms, 4 ohms or 8 ohms.
Note: The remaining Loudspeaker Terminals on the
refer to the Connection Diagram on the next page.
This is an example of a typical audio system, your
system may vary from this, however the actual Loud-
speaker would be connected in a similar manner.
5. Connect the Loudspeaker hookup cables from a
single Loudspeaker to the MC75 Negative Output
Terminal identified as COMmon and Positive Out-
put Terminal indentified as 2Ω (ohms), 4Ω (ohms)
or 8Ω (ohms) connection that matches the imped
-
ance of the Loudspeaker, being careful to observe
the correct polarities. If the Loudspeaker’s imped-
ance is in-between the available connections, use
the nearest lower impedance connection. Refer to
“General Information” Note 4 on page 6 for ad-
ditional information.
WARNING: Loudspeaker terminals are hazard-
ous live and present a risk of electric
shock.
6. Connect the MC75 Power Cord to a live AC outlet.
Loudspeaker Cable Distance vs Wire Gauge Guide
Loudspeaker
Impedance
25 feet
(7.62 meters)
or less
50 feet
(15.24 meters)
or less
100 feet
(30.48 meters)
or less
2 Ohms
12AWG
10AWG
8AWG
4 Ohms
14AWG
12AWG
10AWG
8 Ohms
16AWG
14AWG
12AWG
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Loudspeaker
