Description

JBL 2450J 2" High Frequency Compression Driver 16 Ohm

The model 2450H/J is a professional quality, compact size and light weight large-format Compression Driver that incorporates a Neodymium rare-earth magnet assembly designed by extensive computer modeling including finite Element analysis. The new magnet assembly provides the equivalent electromechanical conversion efficiency (B1 factor) at two-thirds the size and one-third the weight required by previous large-format Compression Driver designs.

The newly-developed Coherent Wave phasing Plug assembly consists of four die-cast annular aperture structures of constant path length to provide in-Phase combining of Diaphragm output at the drivers exit. This optimized configuration allows coherent summation of energy up to much higher frequencies than previous designs, with an attendant increase in perceived high-Frequency clarity.

The new Diaphragm design includes JBLs exclusive three-dimensional diamond pattern surround which reduces membrane stresses in the Diaphragm support structure and extends Diaphragm life. The depth of the diamond pattern is closely controlled during the manufacturing process to provide predictable frequencies for the 2nd and 3rd normal Resonance modes and for the basic suspension Resonance mode.

Specifications:

Throat Diameter: 49 mm (2 in)

Nominal Impedance:2450H 8 ohms2450J 16 Ohms

Minimum Impedance: 6 Ohms (H), 12 Ohms (J) @ kHz 5

DC Resistance: 4.3 Ohms (H), 8.5 Ohms (J) 10% @ 25%

Power Capacity:100 W continuous program above 500 Hz150 W continuous program above 1 kHz

Sensitivity:111 dB SPL, 1 W @ 1 m on-axis on horn118 dB SPL, 1 mW on plane-wave tube

Nominal Efficiency: 30% (500 Hz to 2.5 kHz)

Frequency Range: 500 Hz to 20 kHz

Recommended Crossover: 500 Hz or higher, 12 dB/Octave minimum

Diaphragm: 0.05 mm (0.002 in) pure titanium

Voice Coil Diameter: 100 mm (4 in)

Voice Coil Material: Edgewound Aluminum ribbon

Flux Density: 1.9 T (19,000 gauss)

B1 Factor:12.7 (H) N/A18 (J) N/A

Positive Voltage to black terminal gives Diaphragm motion toward the phasing Plug

Dimensions: 167 mm (6-37/64 in) diameter, 139 mm (5-29/64 in) depth

Mounting: Four 1/4-20 threaded holes, 90 apart on 101.6 mm (4 in) diameter

Net Weight: 4.8 kg (10-1/2 lb)

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