National EAS-20F100
¥ 8,000 (1 unit, around 1987)
Commentary
F100 series 20 cm cone type full range unit capable of high power regeneration.
The voice coil uses an edgewise wound voice coil with copper-coated aluminum ribbon wire, and has a highly heat-resistant design that can withstand temperatures of 200 ℃.
By adopting a pure copper short ring for the pole piece, distortion due to eddy current is reduced, and high-frequency characteristics are further improved.
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Model Rating
| Type | 20 cm cone type full range unit |
| Impedance | 8 Ω |
| Fo (lowest resonance frequency) | 80Hz |
| Frequency characteristic | Fo ~ 12 kHz |
| Output sound pressure level | 97dB/W/m |
| Input (Max) | 100W |
| Magnetic flux density | 9,800gauss |
| Total flux | 170,000maxwell |
| Cone Effective Radius | 82mm |
| Mo (equivalent mass) | 11.4g |
| Qo | 0.48 |
| Weight | 2.6kg |