OSTEX/FOSTER FE-163
8 Ω : ¥ 2,500 (1 unit, sold in May 1965)
¥ 3,000 (1 piece, around 1972)
¥ 4,400 (1 piece, around 1976)
16 Ω : ¥ 2,500 (1 unit, sold in May 1965)
200 Ω : ¥ 3,000 (1 unit, sold in May 1965)
Commentary
A 16 cm full-range speaker unit designed with the goal of being easily incorporated into real life and having satisfactory quality.
The edge uses a free edge method in which cloth is impregnated with a special chemical agent and molded into a roll shape.
バリゥム ferrite magnets are used for the magnetic circuits.
In addition to the normal 8/16 Ω model, there was a 200 Ω model and a model with a stronger magnetic circuit (FE-163 Σ).
The FE-163 specifications listed in the catalog were different around 1965 and around 1972.
Also, there was a model change around 1976, and it was described as FE163New (FE163N) in the catalog.
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Model Rating
| Method | 160 mm full-range speaker unit |
| Playback frequency band | Fo ~ 16 khz (circa 1965) Fo ~ 20 kHz (around 1972) |
| Lowest resonance frequency (fo) | 40 Hz to 60 Hz (around 1965) 50 Hz (around 1972) |
| Impedance | 8 Ω, 16 Ω, 200 Ω (around 1965) 8 Ω (around 1972) |
| Output sound pressure level | 98 dB (around 1965) 92dB/W/m (around 1972) 91.5dB/W/m (around 1976) |
| Max Input | 10W (nominal 5W, circa 1965) 25W (Music, circa 1972) |
| Air gap magnetic flux density | 10,000 gauss (circa 1965) 12,000 gauss (circa 1972) |
| Total flux | 49,500maxwell |
| Equivalent vibration radius | 6.5cm |
| Vibration system equivalent mass | 6g 7.0g (around 1976) |
| Qo | 0.3 0.4 (circa 1976) |
| Magnet weight | 398g (around 1976) |
| Aperture | 160mm |
| Baffle Hole Diameter | 140 φ mmm |
| Standard enclosure volume | 23 liters |
| External dimensions | Width 166x Depth 137.5 mm |
| Weight | 1.260 kg (around 1965, around 1976) 0.95 kg (around 1972) |