JBL 2451H/2451J
Released in 1993
¥ 208,950 (tax included, 1 unit, around 2007)
Commentary
A high frequency compression driver unit with a throat diameter of 38 mm that uses neodymium magnet.
2451H is an 8 Ω model and 2451J is a 16 Ω model.
The phase plug has a coherent wave structure and is designed so that the phase plug can be directly connected to the horn throat.
The diaphragm is made of titanium and the edge of the unique diamond surround structure reduces metal fatigue and improves durability.
Neodymium magnet is used for the magnetic circuit.
Model Rating
| Type | Driver unit |
| Throat diameter | 38mm |
| Nominal impedance | 2451H : 8 Ω 2451J : 16 Ω |
| Allowable input (continuous program) | 100W(>500Hz) 150W(>1kHz) |
| Sensitivity (1W, 1m) | 111 dB SPL (2 kHz octave band with Q = 6.3 horn) |
| Frequency range (-10dB) | 500 Hz to 20 kHz |
| Recommended minimum crossover frequency | 500Hz |
| Diaphragm | Φ 100 mm, Pure Titanium |
| Voice coil | Φ 100 mm, Edge Rolled Aluminum / Ribbon |
| Polarity (*) | - |
| Magnetic flux density | 1.9T |
| Dimensions | Diameter 165x depth 73 mm |
| Weight | 4.5kg |
| * When a positive voltage is applied to the red terminal, the direction in which the cone moves + : front / - : rear | |