Pioneer PE-12
Pioneer PE-12 is a wide range driver from the middle sixties, that can be found in the Pioneer CS-51 speaker system together with the 70-05F tweeter.
This driver has impressive ring AlNiCo magnet system, solid die
cast basket and jewelry crafted terminals.
The fabric of the surround covers the major part of the cone's area
and only a small sector in the middle is uncovered paper. The
surround itself is still soft and sticky after fifty years.
My Measurements
| Driver Properties | Thiele - Small Parameters | ||||
|---|---|---|---|---|---|
| Chassis material | Die Cast Aluminum Alloy | Parameter | Measured | Datasheet | |
| Membrane material | Paper/Cloth | Fs | 87 Hz | 60 Hz | |
| Magnet System | AlNiCo | Re | 14.7 Ω | N/A | |
| Surround | Cloth | Qms | 1.6 | N/A | |
| Voice Coil Diameter | 25 mm | Qes | 0.55 | N/A | |
| Nominal Impedance | 16 Ω | Qts | 0.41 | N/A | |
| Sensitivity | 94 dB/W/m | Vas | 2.8 ltr | N/A | |
| Rated Power | 5/20W | Le | 0.52 mH | N/A | |
Frequency response at 1m with 2.83 V input RED - on axis, BLUE - 15 º off axis, GREEN - 30 º off axis
Since the driver is designed for back-mounting only, the
measurements had done on the panel with a opening with diameter
equal to the gasket's internal edge. The opening has a conical shape
with 45 º bevel.
The second, third and fourth harmonic curves measured at 2.83V input RMS.
Burst decay response, measured at 1m on axis
The impedance curve in 18 ltr sealed box
Conclusion
The sound of this real craftsman's gem is smooth and pleasant. They deserve more serious cabinet that the original CS-51. I plan to use the four units I have as a wide midranges in D'Appolito configuration in a combination with a worthy tweeter.
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