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Yamaha M-4

Stereo Power Amplifier (1978-83)

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Yamaha M-4


Power output: 120 watts per channel into 8Ω (stereo)

Frequency response: 1Hz to 100kHz

Total harmonic distortion: 0.005%

Damping factor: 200

Input sensitivity: 1V

Signal to noise ratio: 118dB

Speaker load impedance: 4Ω to 8Ω

Semiconductors: 81 x transistors, 3 x IC, 2 x dual FET, 34 x diodes, 2 x bridged diodes, 2 x zener diodes, 28 x LED

Dimensions: 435 x 145.5 x 374.5mm

Weight: 18.5kg

Year: 1980


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Professional Series

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Reviewed Jun 02nd, 2016 by sberger

Fantastic amp, particularly when restored and running properly. Big full sound with much detail. Huge soundstage. Teamed up with it's matching C-4 preamp is something to hear.

Reviewed Jan 30th, 2016 by Electone

Beautiful design, great sound and very easy to work on.

Reviewed Jun 07th, 2015 by craigtone

Probably my favorite vintage solid-state amplifier. I was a tube amp aficionado until I got my hands on a used M-4. This amp gave me confidence back in solid-state gear. I regret selling it and am still always on the lookout for the coveted M-2 (the M-4's bigger brother).

Reviewed Nov 06th, 2014 by ehg

Found mine by accident and it sounds great!
It is partnered to a C2x and the NS1000m which were formerly coupled to a Medevoort poweramp.
Some say I should re-cap it, but first I''m going to enjoy its sound for a few days?

Reviewed Apr 05th, 2014 by Genpatton

Had this amp back when I was in College, but had to sell it. Just picked up another in excellent condition. Its a great, sweet sounding amp that is under rated in my opinion.



re: M-4

Thanks for the free manuals. Have had this M4/C6 combo since early 80's.
My Wife & I created a 600 sq ft listening room for it. Systemdek IIX TurnTable with Premier Arm, Talisman III MC cart with M4/C6 driving Linn SARAS; experts said it wouldn't work, wouldn't handle the load.

Boy, were they wrong.

With the room lites turned off & Pink Floyd's:
"Wish you were here", "The final Cut" or "The Wall" or
any other vinyl album playing on the Systemdek IIX; the Sound Stage Imaging, from the lowest bass all the way up was outstanding. You could even 'hear' the space between the instruments.

My expert buddies with expensive tube pre amps, power amps were stunned.

A year later I added a Velodyne 15" servo powered sub woofer with it's own 300 watt amp. I won't go on about the quality of the music, just use your imagination.

I have a nice wide angle pix of the room and would include it in this post, but didn't see a way.



Thanks for the free manual!

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