National EAS-20F20
¥ 10,000 (1 unit, around 1987)
Commentary
A 20 cm full range unit of the F20 series that pursues wide and flat frequency characteristics and enhances the completeness as a full range.
The pole piece with a pure copper short ring and the dome diaphragm directly connected to the voice coil provide a clear mid-high range.
1.4 kg magnet is used for the magnetic circuit.
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Model Rating
| Type | 20 cm cone type full range unit |
| Impedance | 8 Ω |
| Fo (lowest resonance frequency) | 32Hz |
| Frequency characteristic | Fo ~ 16 kHz |
| Output sound pressure level | 95dB/W/m |
| Input (Max) | 70W |
| Magnetic flux density | 13,000gauss |
| Total flux | 290,000maxwell |
| Cone Effective Radius | 82mm |
| Mo (equivalent mass) | 13.6g |
| Qo | 0.17 |
| Weight | 4.0kg |