Pin 1
Pin 3
Pin 2

Introduction and Performance Features

Table of Contents

 

Connector Information

 

 

 

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

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 Positive Power Control Input on other

Front Panel Displays and Controls

14

How to Operate

15

Technical Description

17

Specifications

18

Packing Instructions

19

McIntosh Components.

N/C

Ground

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.

4

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McIntosh MC402 owner manual Table of Contents, Important Information

MC402 specifications

The McIntosh MC402 is a powerful and elegant amplifier that represents the pinnacle of high-fidelity audio performance. This two-channel amplifier stands out in the McIntosh lineup, delivering a robust 400 watts per channel into 2, 4, or 8-ohm loads. It is designed for audiophiles who seek uncompromising sound quality and superior performance, making it an ideal choice for both home studios and high-end listening rooms.

One of the standout features of the MC402 is its unique Autoformer technology, which allows the amplifier to deliver the same power output irrespective of the speaker impedance. This feature ensures that users enjoy consistent performance whether they are using 2-ohm, 4-ohm, or 8-ohm speakers. The use of transformers is integral to maintaining fidelity and output power while providing an additional layer of protection for the amplifier and connected speakers.

Additionally, the MC402 employs a quad balanced circuit design, which helps to eliminate distortion and achieve greater clarity in sound reproduction. This approach ensures that the audio signal remains pure from input to output, allowing listeners to experience their music in the way it was intended to be heard. The dual-construction design of the amplifier not only enhances its aesthetic appeal with the classic McIntosh blue meters and sleek black glass front but also contributes to its durability and reliability over time.

The amplifier features a robust cooling system that includes large heat sinks to dissipate heat effectively, ensuring optimal performance even during prolonged listening sessions at high power levels. This aspect of its design guarantees that the MC402 maintains a consistent performance without overheating.

In terms of connectivity, the MC402 is versatile, featuring balanced and unbalanced inputs to accommodate a variety of audio sources. The amplifier also has a signal sensing circuit that automatically turns it on when an audio signal is detected and powers it down when the signal is absent, helping conserve energy and adding convenience for users.

Overall, the McIntosh MC402 amplifier combines cutting-edge technology with timeless design. Its impressive power output, advanced circuitry, and robust construction make it a top choice for those who demand the best in audio performance. Whether driving efficient speakers or high-power systems, the MC402 is engineered to elevate your listening experience to new heights.