McIntosh MC152 Owner's Manual page 8

Output Terminals
When connecting the Loudspeaker Hookup Cables to
the MC152 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.
How to Connect
Caution: Do not connect the AC Power Cord to the
MC152 Rear Panel until after the Loudspeaker
Connections are made. Failure to observe this
could result in Electric Shock.
The connection instructions below, together with the
MC152 Connection Diagram located on the separate
folded sheet "Mc1A", is an example of a typical audio
system. Your system may vary from this, however the
actual components would be connected in a similar
manner. For additional information refer to "Connec-
tor and Cable Information" on page 4.
8
1. For Remote Power Control, connect a power control
cable from the Audio Preamplifier or A/V Control
Center Power Control Output 1 to the Amplifier
PoWeR ConTRoL IN.
Note: When a Power Control Cable is connected
2. Connect XLR cables from the Balanced Output 1
(L&R) of an Audio Preamplifier or A/V Control
Opening
Center to the Amplifier BALanced INput (Right
Figure A Figure B
and Left). Place the INPUT MODE Switch in the
BALanced Position.
Note: An optional hookup is to use unbalanced
This McIntosh MC152 Power Amplifier is designed
for Loudspeakers with an impedance of 2 ohms, 4
Figure C Figure D
ohms or 8 ohms. Connect a single Loudspeaker only
to the Right and Left Output Terminals.
When connecting Loudspeakers to the MC152 it
is very important to use cables of adequate size, so
there is little to no power loss in the cables. The size is
Figure E
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
2 Ohms
4 Ohms
8 Ohms
between the MC152 and Preamplifier (or A/V
Control Center), the AUTO OFF Feature is
bypassed. Refer to page 13.
cable and place the INPUT MODE Switch in
the UNBALanced Position.
25 feet 50 feet
(7.62 meters) (15.24 meters) (30.48 meters)
or less or less
12AWG 10AWG
14AWG 12AWG
16AWG 14AWG
3. Prepare the Loudspeaker Hookup Cable for attach-
ment to the MC152 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:
4. Attach the previously prepared bare wire cable ends
into the banana plugs and secure the
connections. Refer to figure F.
5. Rotate the top of the Output Terminal
Post clockwise until it is finger tight.
Refer to figure G. Then using the
McIntosh Wrench, rotate the top of the
100 feet Output Terminal one quarter of a turn
(90° ). Do not over tighten. Refer to
or less
figure E.
8AWG
6. Referring to figure H,
10AWG
connect the Loudspeaker
12AWG
hookup cables with ba-
nana plugs into the hole
at the end of the MC152
Negative and Positive
Figure 3 Figure 4
Figure 2
Figure F
Figure G
Figure H