Pioneer PAX-20A/PAX-8A
¥ 3,700 (around the late 1960 s?)
Commentary
A 2-way coaxial speaker unit with a cone type tweeter added to the 20 cm cone type woofer PW-20A (PW-8).
When I changed from inches to centimeters, the model number was also changed from PAX-8A to PAX-20A.
Pioneer's proprietary APC Parabolic Cone is used for the low-range cone. The cone paper produced by this APC method has low mass, large Young's modulus and excellent internal loss. The characteristics of the mid-range are flattened by braking due to the internal loss of the cone paper and by special bis-colloidal treatment of the edge. The cone shape is parabolic.
The high-range section is a 2-inch cone-type tweeter with a built-in network that cuts the low-range section, and the high-range cone uses a corrugated curved cone.
A special metalized network uses a special metalized capacitor, which is inserted in series with the voice coil of the tweeter to cut off the low frequencies entering the tweeter.
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Model Rating
| Type | 20cm2-way coaxial speaker |
| Impedance | 16 Ω |
| Lowest resonance frequency (fo) | 50 Hz to 70 Hz |
| Reproduction frequency characteristic | 40 Hz to 20 kHz |
| Maximum allowable input | 8W |
| Output sound pressure level | 103dB/W |
| Total flux | Woofer : 62,500 maxwell Tweeter : 13,000 maxwell |
| Magnetic flux density | Woofer : 10,100 gauss Tweeter : 10,000 gauss |
| Equivalent mass | 8.7g |
| Baffle opening | 172 φ mm |
| Mounting hole position | 193 φ mm |
| External dimensions | Diameter 205x Depth 118 mm |
| Weight | 1.73kg |