Legendary Yamaha C-4 preamplifier and M-4 power amplifier absolute Beast 160W of sheer Power

Legendary Hifi
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Yamaha C-4 preamplifier and M-4 power amplifier are a classic late-1970s/early-1980s stereo separates pairing known for transparent "Natural Sound" performance, heavy-duty metal construction, and extensive vinyl support. Released around 1979–1981, they marked Yamaha's shift from silver-faced gear to sleek black-faced components with backlit switches.


AttributeYamaha C-4 (Preamplifier)Yamaha M-4 (Power Amplifier)RoleStereo Control Amplifier (Preamp)Stereo Power AmplifierPower OutputN/A (2V nominal / 10V max Pre-Out)120W per channel into 8ΩFrequency Response5Hz – 100kHz1Hz – 100kHzTotal Harmonic Distortion0.0035%0.005%Signal-to-Noise Ratio100dB (Line), 85dB (MM), 77dB (MC)118dBDamping FactorN/A200Weight8.6 kg18.5 kgDimensions (W x H x D)435 x 116 x 376 mm435 x 145.5 x 374.5 mm

(Full technical specifications are documented in the HiFi Engine C-4 Manual and HiFi Engine M-4 Manual.) [1, 2]

Notable Highlights

Vinyl Enthusiast's Preamp (C-4). The C-4 features three gold-plated phono inputs (two Moving Magnet and one Moving Coil) alongside front-panel impedance and capacitance loading adjustments. Users on r/vintageaudio agree that its discrete phono circuitry makes it a standout choice compared to later models. [1, 2, 3]

Dual Pre-Outs & Headphone Stage (C-4). It includes two independently switchable pre-outs for bi-amping or running a subwoofer, plus a dedicated internal amplifier capable of driving demanding headphones. [1, 2]

High-Bias Power Stage (M-4). The M-4 operates in pure Class-A for the first few watts before transitioning to Class-A/B, delivering a clean, detailed soundstage capable of handling 4Ω to 8Ω speaker loads. [1]

Minimalist Power Amp Controls (M-4). The front panel features LED peak power meters, speaker A/B selectors, and a DC/AC coupling switch, while independent left/right gain pots are tucked on the rear. [1, 2]