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McIntosh Power Amplifier MC303

McIntosh Power Amplifier MC303
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McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 www.mcintoshlabs.com
MC303
Owners Manual
Power Amplifier
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McIntosh Power Amplifier MC303 Specifications

General IconGeneral
Number of Channels3
Total Harmonic Distortion0.005%
Input Sensitivity1.0V
Power Output per Channel300 watts
Rated Power Band20Hz to 20kHz
S/N below rated output> 100 dB
Voltage Gain26 dB
Signal to Noise Ratio> 100 dB
Damping Factor>40
Dimensions17.5 x 7.6 x 19.5 inches
Power Requirements120V, 60Hz

Summary

Important Safety Instructions

Electrical and Fire Hazard Warnings

Warnings about uninsulated voltage, rain, and moisture exposure.

User Serviceability and Internal Access

Prohibition of opening the unit and requirement for qualified personnel for servicing.

General Operation Safety Guidelines

18 key safety instructions for operating and maintaining the equipment.

Technical Assistance and Customer Service

Connector and Cable Information

Key Performance Features

High Power Output Capability

300W per channel output with Thermal Trak transistors for low distortion.

McIntosh Power Guard Protection

Patented circuit to prevent amplifier clipping and protect loudspeakers.

Sentry Monitor and Thermal Safeguards

Protection circuits ensuring long operating life and preventing overheating.

Patented Autoformer Technology

Autoformers for optimal speaker load matching and DC protection.

Dimensions and Physical Layout

Installation and Cabinet Mounting

Rear Panel Connections and Controls

Connecting for Surround Channels

Connecting for Front Channels

Front Panel Controls and Displays

Power Output Metering

Explanation of the three power output meters.

Power Guard Status LEDs

Indicators showing the status of the Power Guard circuits.

Operating the MC303 Amplifier

Power On Procedures

How to turn the amplifier on manually or via remote signal.

Understanding Power Guard

How Power Guard indicators work and protection during overheating.

Technical Description Overview

Design Philosophy and Circuitry

ThermalTrak Power Transistors

Details on advanced transistors for accurate temperature monitoring.

Autoformer Functionality Explained

The role of Autoformers in impedance matching and loudspeaker protection.

Protection and Performance Circuits

Autoformer Advantages

Benefits of Autoformers for matching and protecting speakers.

Sentry Monitor Protection Circuit

The output transistor protection circuit for safe operation.

Power Guard Distortion Prevention

How Power Guard eliminates clipping distortion and its impact.

Power Supply and Control Systems

Detailed Specifications

Power, Impedance, and Bandwidth

Specifications for power output, load impedance, and rated power band.

Distortion, Headroom, and Frequency Response

Technical specs for THD, dynamic headroom, and frequency response.

Input Sensitivity and Noise Performance

Specifications for input sensitivity and signal-to-noise ratio.

Packing and Shipping Instructions

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