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Pioneer PE-12

Pair of Pioneer PE-12 4 inch Fullrange Drivers

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.

Pioneer CS-50 Loudspeaker System Pioneer SC-51 Speaker System Inside

Pioneer PE-12 Back

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.

Pioneer PE-12 manufacturer's SPL graph

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 

SPL Responce of Pioneer PE-12 at 1m on axis and 15 30 deg off axis

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.

Second, Third and Fourth Harmonic of Pioneer PE-12 in 18 ltr sealed box

The second, third and fourth harmonic curves measured at 2.83V input RMS.

Burst decay Responce of Pioneer PE-12 at 1m in 18 ltr sealed box

Burst decay response, measured at 1m on axis

The impedance ofTang Pioneer PE-12 in 18 ltr seled box

The impedance curve in 18 ltr sealed box


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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