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Yamaha M-4 User Manual

Yamaha M-4
12 pages
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Yamaha M-4 Specifications

General IconGeneral
Total Harmonic Distortion0.005%
Damping Factor100
Signal to Noise Ratio120 dB
Weight12.5kg
Power Output120W per channel into 8Ω (stereo)
Input Sensitivity1V
Dimensions435 x 112 x 375mm

Summary

FEATURES

Voltage Amplifying Stage Design

Explains cascade-connected differential two-stage circuit and FET input for stability and performance.

Driver and Power Amplifier Circuitry

Describes the three-stage emitter follower with complementary OCL SEPP for wide bandwidth.

Power Supply and Stability Features

Highlights large capacitors and separate power supplies for low distortion and stable operation.

Component and Layout Considerations

Mentions mylar/styrol capacitors, layout, and general design for audio characteristics.

CAUTION; READ THIS BEFORE OPERATING YOUR M-4

Safety and Operating Precautions

Covers installation, ventilation, handling, unauthorized opening, power cord, record playback, cleaning, and service.

CONNECTION DIAGRAM

CONNECTION AND OPERATION

AC Power and Speaker Connections

Covers proper AC connection and speaker impedance/terminal setup.

Amplifier Operation and Settings

Details connecting to control amp, input sensitivity, and mode switch functions.

FRONT PANEL AND CONTROLS

Power Switch Operation

Describes the function of the POWER button and initial sound delay.

Speaker Selection Switches

Explains the push-button switches for selecting speaker terminals A and B.

Output Level Indicators

Details the peak and overload indicators for monitoring output levels and clipping.

SPECIFICATIONS

BLOCK DIAGRAM/CHARACTERISTIC DIAGRAM

SCHEMATIC DIAGRAM

TROUBLESHOOTING

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