| 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
1974
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.
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