Pioneer Exclusive M4

1 9 7 4 1974
1 9 7 9 1979

Huge Class A powerhouse and true bestseller for Pioneer : the M4 could be seen in many many many high-end rigs of the times.

So successful that it remained available for almost 5 years, until the updated Exclusive M4a was launched (1979) and ultimately the Exclusive M5 monoblock (1982) .

The Exclusive M4 is a Class A version of the already popular Exclusive M3 : same basic design, same power transistors, same looks, same weight...
Except it puts out 2x 50W in pure Class A - room-heater ahead !

Absent from the M4 are the three speaker pair terminals and input level pots ; the pre-driver stage is also simplified.
Added to the M4, Class A oblige, are two cooling fans (driven by low-voltage for low-noise) and a posistor as heat sensor plus a thyristor as heat adjuster.

This is what educated high-end should look and sound like. The audiophiles of the time didn't miss that.

Pioneer Exclusive M4, image 1 Pioneer Exclusive M4, image 2 Pioneer Exclusive M4, image 3
Pioneer Exclusive M4 specifications
Title Value
Circuit : One-stage differential operation push-pull
two-stage Darlington quadruple push-pull
Pure complementary OCL Class A operation
Power output : 2x 50W (2Hz...20Khz, 8 Ohm)
THD : < 0,1% at 50W
< 0,03% at 1W
IMD : < 0,1% at 50W
< 0,03% at 1W
Power bandwidth : 5Hz...70Khz (IHF)
Frequency response : 3Hz...60Khz (+0 / -1dB)
Inputs : 1V or 2V adjustable sensibility
Subsonic filter : 6dB/octave below 8Hz
Damping factor : 30 at 8 Ohm
Peak meters range : 0,0005W...100W (-40dB...+3dB)
PC : 320W
Dimensions : 46,8 x 20,6 x 38,5cm
Weight : 27,3kg.
List price : 350,000¥
Pioneer Exclusive M4 : 0 topic
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page online since : may 2007
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