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Output Terminals
When connecting the Loudspeaker Hookup Cables to
the MI254 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 for Multi Channel System
Caution: Do not connect the AC Power Cord to the MI254
Rear Panel until after the Loudspeaker Con-
nections are made. Failure to observe this could
result in Electric Shock.
The connection instructions below, together with the
MI254 Connection Diagram located on the separate
folded sheet "Mc1A", is an example of a typical Mul-
tichannel System. Your system may vary from this,
however the actual components would be connected in
a similar manner. For additional information refer to
8
"Connector and Cable Information" on page 3.
1. For Remote Power Control, connect a power control
cable from the A/V Control Center Power Control
Trigger/Output 1 to the Amplifier PWR CNTRL
Power Control INput.
Note: When the Power Control Cable is connected
Opening
2. Connect XLR cables from the Balanced Outputs
(HR1, HL1, HR2, and HL2) of an A/V Control
Figure B
Figure A
Center to the MI254 BALanced INPUTS (CHAN-
NELs - 1/R, 2/L, 3/R and 4/L ) making sure to
match up channel designations.
Note: The MI254 UNBALanced Inputs may be used
Figure C
Figure D
3. Place the Input Selector Switches for all four chan-
nels in the "LINE" position.
This McIntosh MI254 Power Amplifier is designed
for Loudspeakers with an impedance of 4 ohms or
Figure E
8 ohms. Connect a single Loudspeaker only to each
Channel Output Terminals.
When connecting Loudspeakers to the MI254 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
4 Ohms
8 Ohms
between the MI254 and an A/V Control Center,
the AUTO OFF Signal Sensing Circuitry is
automatically disabled.
in place of the Balanced Inputs when the A/V
Control Center has Unbalanced Output Con-
nections instead of Balanced Connections.
25 feet
50 feet
(7.62 meters)
(15.24 meters)
(30.48 meters)
or less
or less
14AWG
12AWG
16AWG
14AWG
4. Prepare the Loudspeaker Hookup Cable for attach-
ment to the MI254 Power Amplifier:
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.
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. Attach the previously prepared bare wire cable
ends into the banana plugs and secure
the connections. Refer to figure 4.
6. Referring to figure 5, connect the
Loudspeaker hookup cables with
banana plugs into the hole at the end
of the MI254 Negative and Positive
Output Terminals, making sure to
match up channel designation with
Loudspeaker location.
WARNING: Loudspeaker terminals
are hazardous live and present a risk of
100 feet
electric shock. For additional instruc-
or less
tion on making Loudspeaker Connec-
tions contact your McIntosh Dealer or
10AWG
McIntosh Technical Support.
12AWG
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
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