YAMAHA JA-5004
¥ 11,000 (1 unit, around 1973)
Commentary
This NS type woofer unit has a large 420x540mm diaphragm and is designed to be used in two way system.
In order to make the diaphragm lighter and more rigid, a molding method is adopted in which expanded polystyrene is molded with an epoxy binder and then finished by special processing.
Yamaha's proud YM-5S magnet is used.
Because of the wide range design, it can also be used as a 2-way unit.
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Model Rating
| Type | NS Type Woofer Unit |
| Impedance | 8 Ω |
| Rated input | 18W |
| Fo / cut-off frequency | 35Hz |
| Frequency characteristic | 35 Hz to 6 kHz |
| Output sound pressure level | 92dB/W/m |
| Magnetic flux density | 12,700gauss |
| Total flux | 213,000maxwell |
| External dimensions | Width 460x Height 580x Depth 95.6 mm |
| Weight | 3.9kg |