JBL 2405
Released in 1971
¥ 44,500 (1 unit, around 1973)
¥ 37,000 (1 unit, around 1978)
¥ 44,000 (1 unit, around 1981)
Commentary
Horn type tweeter that employs a split-horn.
The diaphragm is made of 0.0056 cm aluminum foil molded by air pressure and has undergone electrolytic protection treatment. Since the sound wave emitted from the diaphragm passes through the diffraction horn, the directional characteristics are greatly improved.
The magnetic circuit uses an Alnico V magnet and a 44 mm diameter edgewise wound voice coil.
The impedance was 12 Ω in the initial model, but it was changed to 16 Ω from around 1975.
The mounting hole is 8.1 cm common to 2402, 2403 and 2405.
Model Rating
| Type | Horn type tweeter |
| Impedance | 12 Ω (Initial) 16 Ω (late stage) |
| Horn Opening / Throat Diameter | 7.9x1.8cm |
| Allowable input (continuous program) | 30W (1973 catalog) 20W (listed in the catalog after 1975) |
| Sound pressure level | 105dB/W/m |
| Frequency characteristic | 6.5 kHz to 21.5 kHz |
| Directional | 90 ° x30 ° (16 kHz) 65 ° x25 ° (20 kHz) |
| Crossover frequency | 7 kHz or more |
| Voice Coil Diameter / Material | 3.2 cm (according to 1973 catalog) 4.4 cm, aluminum (listed in the catalog after 1975) |
| Weight of magnetic circuit | 1.5kg |
| Magnetic flux density | 16,500gauss |
| External dimensions | Diameter 98x Depth 83 mm |
| Weight | 2.7 kg (according to 1973 catalog) 2.0 kg (listed in the catalog after 1975) |
.jpg)