The Yamaha M-4 is a DC stereo power amplifier featuring pure complementary OCL and parallel push-pull circuitry. It delivers 120W + 120W of output without strain on its large-capacity power supply section, utilizing high-fT transistors for wide bandwidth and low distortion.
The document covers installation precautions such as proper ventilation and placement away from direct sunlight or heat sources. It details connection procedures for speakers (supporting 4Ω to 16Ω impedances) and control amplifiers, including the use of rear panel level controls. The manual also explains front panel functions like the POWER switch with muting relay action and SPEAKER A/B selection switches.
| Rated Output Power (General/European) | 120W + 120W |
|---|---|
| Weight | 18.5 kg |
| Power Consumption (European) | 900W |
| Speaker Impedance (General/European) | 4Ω~16Ω |
| Speaker Impedance (Others) | 8Ω~16Ω |
| Output Level Range | 0.0032W to 100W (8Ω) |
The General model supports 110/120V and 220/240V, while the European model is set for 220V/240V.
Due to the muting relay, no sound will be heard for several seconds after switching on the power to prevent transient noises.
Lower the input sensitivity by turning the LEVEL controls counter-clockwise.