YAMAHA JA-4280/JA-4280B
¥ 38,000 (1 piece, around 1980)
Commentary
This is a Professional Series horn speaker unit equipped with a secaural horn in a driver for mid-range.
The difference between JA 4280 and JA 4280 b is the impedance, JA 4280 is 8 Ω and JA 4280 b is 16 Ω.
It is designed for professional use for musical instruments.
.JPG)
.JPG)
.JPG)
Model Rating
| Type | Horn unit for mid-range |
| Nominal impedance | JA-4280 : 8 Ω JA-4280B : 16 Ω |
| Playback frequency band | 500 Hz to 16 kHz |
| Recommended bandwidth | 1 kHz or more |
| Rated input | 10W |
| Max Input | 20W |
| Output sound pressure level | 106dB/W · m |
| Diaphragm | Dome shaped aluminum alloy |
| Voice coil diameter | 42.6 φ mm |
| Equalizer | Phenol plastic |
| Magnet | Ferrite, 0.85 kg |
| Magnetic flux density | 18,000gauss |
| Total flux | 72,400maxwell |
| External dimensions | Driver Part : Diameter 140 mm x Height 105.3 mm Horn Part : Width 440x Height 170x Depth 307 mm |
| Weight | Driver Part : 3.7 kg Horn Part : 3.1 kg |