YAMAHA JA-3871
¥ 60,000 (1 piece, around 1980)
Commentary
38 cm cone-shaped woofer designed with low fo and low distortion factor as the theme.
JA-3870 uses an Alnico magnet for the magnetic circuit, but JA-3871 uses a ferrite magnet.
The output sound pressure level is higher than JA-3870.
It is designed for use in a bass reflex enclosure of approximately 150L to 200L.
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Model Rating
| Type | 38 cm Cone Woofer |
| Nominal impedance | 8 Ω |
| Playback frequency band | 20 Hz to 2 kHz |
| Recommended bandwidth | 20 Hz to 800 Hz |
| Rated input | 100W |
| Max Input | 200W |
| Output sound pressure level | 97dB/W ・ m |
| Voice coil diameter | 100 φ mm |
| Equivalent mass | 137g |
| Qo | 0.26 |
| fo | 19.5Hz |
| Magnet | Ferrite, 2.9 kg |
| Magnetic flux density | 13,100gauss |
| Total flux | 288,000maxwell |
| Recommended box capacity | 150L ~ 200L |
| External dimensions | Diameter 390 mm x Height 146 mm |
| Weight | 11.2kg |