YAMAHA JA-4281B
¥ 36,000 (1 piece, around 1980)
Commentary
A horn type tweeter of the professional series with improved cost performance based on JA 4272.
A 50 micron thick V-shaped ring diaphragm made of special aluminum alloy is used for the diaphragm.
An external magnetic type of ferrite magnet is used for the magnetic circuit.
In consideration of parallel use, the impedance is 16 Ω.
It uses a spherical horn machined from solid aluminum material.
.JPG)
.JPG)
.JPG)
.JPG)
Model Rating
| Type | Horn type tweeter unit |
| Nominal impedance | 16 Ω |
| Playback frequency band | 3 kHz to 20 kHz |
| Recommended bandwidth | 6 kHz or more |
| Rated input | 20W |
| Max Input | 40W |
| Output sound pressure level | 108dB/W · m |
| Diaphragm | V-shaped aluminum alloy ring |
| Voice coil diameter | 42.6 φ mm |
| Equalizer, horn | Aluminum Milling |
| Magnet | Ferrite, 0.85 kg |
| Magnetic flux density | 19,000gauss |
| Total flux | 76,600maxwell |
| External dimensions | Diameter 140 mm x Height 135 mm |
| Weight | 4.4kg |
| Sold Separately | Mount Ring M-4281B (¥ 7,200) |