JBL 2420
Released in 1971
¥ 101,800 (1 unit, around 1973)
¥ 71,000 (1 unit, around 1978)
Commentary
Driver unit ideal for high-grade monitor system and indoor / outdoor loudspeaker systems
The diaphragm is made of 0.05 mm duralumin alloy by the pneumatic drawing method.
Aluminum ribbon wire edgewise wound voice coil, Alnico V magnet, pure silver impedance control ring, etc. are adopted for high performance.
Model Rating
| Type | Driver unit |
| Throat diameter | 2.5cm |
| Impedance | 16 Ω |
| Allowable input (continuous program) | 30W |
| Sound pressure level | 118 dB (1 mW, 9.1m) |
| Frequency characteristic | 800 Hz to 20 kHz |
| Crossover frequency | 500 Hz or more |
| Voice Coil Diameter / Material | 4.4 cm, aluminum |
| Weight of magnetic circuit | 4.5kg |
| Magnetic flux density | 19,000gauss |
| External dimensions | Diameter 146x Depth 98 mm |
| Weight | 5kg |