8
“Connector and Cable Information” on page 3.
1. For Remote Power Control, connect a power control
cable from the Audio Preamplifier or A/V Proces-
sor Power Control Output Trigger 1 to the Ampli-
fier POWER CONTROL IN.
Note: When a Power Control Cable is connected
between the MC1.25KW and Preamplifier (or
A/V Processor), the AUTO OFF Feature is
bypassed. Refer to page 13.
2. Connect XLR cables from the Output 1 Balanced
R, (refer to note 2 below) of an Audio Preamplifier
or A/V Processor to the Amplifier BALANCED
INput. Place the INPUT MODE Switch in the
BALanced Position.
Notes: 1. An optional hookup is to use unbalanced
cable and place the INPUT MODE Switch
in the UNBALanced Position.
2. When multiple MC1.25KWs are used in
a Stereo or Multichannel System, match
up the Preamplifier or A/V Processor
Channel Output designation to each
MC1.25KW with Loudspeaker and the
Loudspeaker location in the room.
3. Using a suitable tool remove the two screws from
each side of the MC1.25KW Rear
Chassis Handle and temporarily
place them in a safe place. Refer
to figure 1.
This McIntosh MC1.25KW Quad
Balanced Power Amplifier is de-
signed for Loudspeakers with an
impedance of 2 ohms, 4 ohms or 8
ohms. Connect a single Loudspeaker
only to the Output Terminals.
When connecting Loudspeakers
to the MC1.25KW it is very impor-
tant to use cables of adequate size, so there is little to
no power loss in the cables. The size is specified in
Gauge Numbers or AWG (American Wire Gauge).
The smaller the Gauge number, the larger the wire
size:
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
4. Prepare the Loudspeaker Hookup Cable for attach-
ment to the MC1.25KW Power Amplifier:
Bare wire cable ends:
Carefully remove sufficient insulation from the
cable ends, refer to figures 2, 3 & 4. If the cable
is stranded, carefully twist the strands together
as tightly as possible.
Notes: 1. If desired, the twisted ends can be tinned
with solder to keep the strands together.
2. The prepared bare wire cable ends may be
inserted into spade lug connectors.
3. Banana plugs are for use in the United
States and Canada only.
Banana Plugs are for use in the United States and
Canada only:
5. Locate the Terminal Connections Cover from the
inside of the MC1.25KW shipping carton. Insert
the just prepared Loudspeaker hookup cables thru
the cover opening on the right side. Refer to figure
5.
How to Connect
Caution: Do not connect the AC Power Cord to the
MC1.25KW Rear Panel until after the Loud-
speaker Connections are made and the protec-
tive Terminal Connections Cover is installed.
Failure to observe this could result in Electric
Shock.
The connection instructions below, together with
the MC1.25KW Connection Diagram located on the
separate folded sheet “
Mc1A
”, is an example of a typi-
cal audio system. Your system may vary from this,
however the actual components would be connected in
a similar manner. For additional information refer to
Figure 2
Figure 3
Figure 4
Output Terminals
When connecting the Loudspeaker Hookup Cables to
the MC1.25KW Power Amplifier Output Terminals
please follow the steps below:
1. Rotate the top of the Output Terminal Post coun-
terclockwise until an opening
appears. Refer to figures A and
B.
2. Insert the Loudspeaker hookup
cable into the Output Terminal
Post opening or the cable spade
lug around the center post of
the Output Terminal. Refer to
figure C.
3. Rotate the top of the Output
Terminal Post clockwise until it
is finger tight. Refer to figure D.
4. Place the supplied McIntosh
Wrench over the top of the Out-
put Terminal and rotate it one
quarter of a turn (90° ) to secure
the Loudspeaker Cable Connec-
tion.
Do not over tighten.
Refer
to figure E.
Figure A
Opening
Figure B
Figure C
Figure D
Figure E
Figure 1
Remove Screws
