Yamaha M-4

Data

General

• Manufacturer: Yamaha
• Model: M-4
• Years of manufacture: 1979 - 1981
• Type: Power Amplifier
• Color: Black
• Remote control: No
• Power consumption: 900 watts
• Dimensions: 435 x 146 x 375 mm (WxHxD)
• Weight: 18.5 kg
• Original price approx.: 1450 DM

Connections

• Number of inputs:
  • Line: 1 V, 25 kOhm
• Number of outputs:
  • 2x loudspeaker

Technical Data

• Continuous power (at distortion factor)
  • 8 Ohm: 2x 120 W

4 Ohm: 2x 170 W

• Dynamic power
  • 8 Ohm: 2x 135 W
  • 4 Ohm: 2x 210 W
• Total harmonic distortion: 0.005% (120 W / 8Ώ ) / < 0.01% (170 W / 4Ώ)
• Attenuation factor: 200 (8Ohm, 1kHz), 100 (4 Ohm / 1 kHz)
• Frequency response: 10 - 100,000 Hz
• Ripple spacing (shorted):
• Stereo channel separation: 90 dB (1 kHz).
• Signal-to-noise ratio: 118 dB

Special Features

• Power display 2 mW - 145 W (10 LEDs / channel)
• Overload indicator (distortion dependent)
• Input level control

Remarks

• Other models in the same series:
• Yamaha M-2

• Previous model:
• None

• Successor model:
• Yamaha M-50

Pictures

• Image: Yamaha M-4

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