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Introduction and Performance Features
Table of Contents
Safety Instructions ............................................................ 2
Thank You and Please Take a Moment............................. 3
Technical Assistance and Customer Service .................... 3
Table of Contents, Important Information and
Connector Information ..................................................... 4
Introduction ...................................................................... 4
Performance Features ....................................................... 4
Dimensions ....................................................................... 5
Installation ........................................................................ 6
Top View........................................................................... 8
Rear Panel Connections and Switches ............................. 9
How to Connect for Stereo ............................................. 10
How to Connect for Mono .............................................. 12
Front Panel Displays and Controls ................................. 14
How to Operate............................................................... 15
Technical Description ..................................................... 17
Specifications ................................................................. 18
Packing Instructions ....................................................... 19
Important Information
Caution: The MC402 Amplifier weight is 110.5 pounds
(50.1 kilograms). It requires two or more persons
to safely handle when moving the amplifier.
1. The following Connecting Cable is available from the
McIntosh Parts Department:
Power Control Cable Part No. 170-202
Six foot, 2 conductor shielded, with two 1/8 inch stereo
mini phone plugs.
2. For additional connection information, refer to the owner’s
manual(s) for any component(s) connected to the MC402.
3. The MC402 mutes the speaker outputs for approximately two
seconds when first turned on.
4. It is very important that loudspeaker cables of adequate size
be used, so that there will be no power loss. The size is
specified in Gauge Numbers or AWG (American Wire Gauge).
The smaller the Gauge number, the larger the wire size:
If your loudspeaker cables are 50 feet (38.1m) or less,
use at least 14 Gauge.
If your loudspeaker cables are 100 feet (76.2m) or less,
use at least 12 Gauge.
5. In the event that the MC402 over heats, due to improper
ventilation and/or high ambient temperature, the protection
circuits will activate. The Front Panel Power Guard LEDs
will continuously indicate ON and the audio will be muted.
When the MC402 has returned to a safe operating
temperature, normal operation will resume.
6. The MC402 incorporates the very latest in Fully Double
Balanced Circuitry. As a result, the Loudspeaker - Negative
Connections are above chassis ground and are not common
between channels. Do not combine any connections together
or ground them, except as illustrated in this manual.
XLR Connectors
Below is the Pin configuration for the XLR Balanced Input
and Output Connectors on the MC402. Refer to the dia-
gram for connection:
PIN 1: Shield/Ground
PIN 2: + Input
PIN 3: - Input
Power Control and Trigger Connectors
The MC402’s Power Control Outputs provide a 5 volt sig-
nal. Use a 1/8 inch stereo mini
phone plug to connect to the
Power Control Input on other
McIntosh Components.
Connector Information
Positive
N/C
Ground
Pin 1
Pin 2
Pin 3