National EAS-20PL90NA
¥ 5,000 (1 unit, around mid 1960 s?)
Commentary
High compliance 20 cm diameter cone type woofer unit.
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Model Rating
| Type | 20 cm cone type woofer unit |
| Allowable input | 16W |
| V. C impedance | 8 Ω |
| Frequency characteristic | 30 Hz to 5 kHz |
| Lowest resonance frequency | 25 Hz to 45 Hz |
| Output sound pressure level | 99dB |
| Magnetic flux density | 9,000gauss |
| Total flux | 110,000maxwell |
| Weight | 3kg |