Pioneer PW-A31
¥ 14,000 (around 1974)
¥ 16,700 (around 1978)
Commentary
A series 30 cm cone shaped woofer.
The cone paper is made of carefully selected fiber material with high Young's modulus and moderate internal loss.
In addition, high compliance type roll edge is adopted for the edge.
A magnetic circuit using a large ferrite magnet is adopted, and a long voice coil with good magnetic efficiency and uniform magnetic flux even at large amplitude is adopted for the voice coil.
In addition, the pole piece of the magnetic circuit is equipped with a pure copper cap to suppress harmonic distortion.
Model Rating
Type | 30 cm Cone Woofer |
Impedance | 8 Ω |
Lowest resonance frequency (fo) | 20Hz |
Reproduction frequency characteristic | Fo ~ 3 kHz |
Max Input | 80W |
Rated input | 40W |
Output sound pressure level | 93dB/W/m |
Crossover frequency | 3 kHz or less |
Qo | 0.27 |
Total flux | 178,000maxwell |
Magnetic flux density | 10,700gauss |
Equivalent mass | 57gr |
Baffle opening | 270 φ mm or 310 φ mm |
External dimensions | Diameter 340x Depth 156.5 mm |
Weight | 6.7kg |