YAMAHA NS-310
¥ 40,000 (1 unit, around 1973)
Commentary
A floor-type speaker system equipped with a special large diaphragm NS type unit.
In the low range, it is equipped with 420x540mm large diaphragm NS type woofer JA-5004.
The diaphragm is specially molded to make it large, light and rigid, and the magnetic circuit uses Yamaha's proud YM-5S magnet.
A horn type tweeter JA-0506B is mounted in the high range.
A special hard duralumin foil of 30 μ thickness is used for the diaphragm, and the edge is reinforced by tangential corrugation.
The magnetic circuit is equipped with is equipped with a 23 φ voice coil with aluminum ribbon wire edgewise winding and a 40 φ magnet with air gap magnetic flux density 17,000 gauss and total magnetic flux 24,600 maxwell, realizing high efficiency with sound pressure of 110 db.
To avoid distortion caused by the network, we use an air-core coil and 0.8 φ formal wire to reduce DC resistance, prevent power loss, and minimize characteristic changes.
An MP capacitor is used for the capacitor.
The enclosure features a quiet, classic design and a stately finish that takes advantage of Yamaha's woodworking techniques.
Model Rating
| Method | 2-way / 2-speaker / rear open system / floor type |
| Units Used | For Low Band : NS Type (JA-5004) For High Range : Short Horn Type (JA-0506B) |
| Playback frequency band | 35 Hz to 20000 Hz |
| Lowest resonance frequency (fo) | 35Hz |
| Impedance | 8 Ω |
| Output sound pressure level | 95dB/W/m (New JIS) |
| Maximum allowable input | 54W |
| Crossover frequency | 5kHz |
| Network | 12dB/oct |
| External dimensions | Width 660x Height 720x Depth 313 mm |
| Weight | 25kg |