National/Technics EAS-20PW09(8P-W1)
Released in 1954
¥ 3,200 (1 unit, around 1967)
Commentary
A 20 cm double cone type full range unit known by the nickname of Genkketsu.
From the launch in 1954 to 1967, 200000 units have been sold.
By adopting an original elliptical corrugation on the main cone, a flatter frequency characteristic is obtained.
A large magnet and a yoke made of high purity mild steel form a strong magnetic circuit.
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Model Rating
| Type | 20 cm Double Cone Type Full Range Unit |
| Allowable input | 8W |
| V. C impedance | 8 Ω |
| Frequency characteristic | 50 Hz to 16 kHz |
| Lowest resonance frequency | 50Hz |
| Output sound pressure level | 94dB |
| Qo | 0.73 |
| Magnetic flux density | 10,500gauss |
| Total flux | 75,000maxwell |
| Cone effective diameter | 166mm |
| Weight | 1.26kg |