YAMAHA JA-2070
¥ 65,000 (1 piece, around 1980)
Commentary
20 cm cone type full range unit.
It is composed of a specially treated white cone with a beryllium center cap. It can be played at high frequencies up to 20 kHz in a 50L bass reflex box.
Alnico magnet is used for the magnetic circuit.
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Model Rating
| Type | 20 cm cone type full microwave oven |
| Nominal impedance | 8 Ω |
| Playback frequency band | 20 Hz to 20 kHz |
| Rated input | 20W |
| Max Input | 40W |
| Output sound pressure level | 91dB/W ・ m |
| Voice coil diameter | 52.7 φ mm |
| Equivalent mass | 14.6g |
| Qo | 0.59 |
| fo | 35Hz |
| Magnet | Alnico, 0.77 kg |
| Magnetic flux density | 11,000gauss |
| Total flux | 200,000maxwell |
| Recommended box capacity | Approximately 50L |
| External dimensions | Diameter 213 mm x Height 116.5 mm |
| Weight | 5.0kg |