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13
Caution: Do not connect the AC Power Cord to the
MA252 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
MA252 Connection Diagram located on the next page
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 addition-
al information refer to “Connector and Cable Informa-
tion” on page 6.
The McIntosh MA252 Power Amplifier Circuitry
is designed for a Loudspeakers with an impedance
of 8 Ohms or 4 Ohms. Connect a single Loudspeaker
only to the Right and Left Output Terminals.
When connecting Loudspeakers to the MA252 it
is very important 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
1. Prepare the Loudspeaker Hookup Cable for attach-
ment to the MA252 Power Amplifier:
Bare wire cable ends:
Carefully remove sufficient insulation from the
cable ends, refer to figures F, G & H. 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:
2. Attach the previously prepared bare wire cable ends
into the banana plugs and secure
the connections. Refer to figure I.
3. Rotate the Output Terminal Post
clockwise until it is nger tight.
Refer to gure J. Then using the
McIntosh Wrench, rotate the top of
the Output Terminal one quarter of
a turn (90°). Do not over tighten.
Refer to gure E.
4. Referring to figure K, connect the
Loudspeaker hookup cables with
banana plugs into the hole at the
top of the terminal to the
MA252 Negative Output
Terminal and Positive
Output Terminal to the
Loudspeaker Terminal
Connections being care-
ful to observe the correct
polarities.
Note: The illustration located on the separate folded sheet
“Mc2B” is for connection to an 8Ω (ohms) Loudspeak-
er.
If the Loudspeaker’s impedance is in-between
the available connections, use the nearest lower
impedance connection. Refer to “General Informa-
tion” Note 6 on page 6 for additional information.
WARNING: Loudspeaker terminals are hazard-
ous live and present a risk of electric
shock. For additional instruction on
making Loudspeaker Connections con-
tact your McIntosh Dealer or McIn-
tosh Technical Support.
Output Terminals
When connecting the Loudspeaker Hookup Cables to
the MA252 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 gures 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
gure C.
3. Rotate the top of the Output
Terminal Post clockwise until it
is nger tight. Refer to gure 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 gure E.
Figure A
Opening
Figure B
Figure C Figure D
Figure E
How to Connect Loudspeakers
Figure F
Figure G
Figure H
Figure I
Figure J
Figure K
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