Description

JBL 2451J High Frequency Compression Driver

Sparkling sound results from JBL's advanced concept.

The JBL 2451J features a Neodymium rare-earth magnet structure for high output, light weight, and compact size. The 38 mm exit allows the Coherent Wave phasing plug to directly couple with Optimized Aperture Bi-Radial© horns to provide lower distortion and better coverage control to 20kHz than previous designs.

The Coherent Wave phasing plug structure has four equal length passages to provide in-phase summation of diaphragm output at the 38mm exit, This optimized configuration produces coherent acoustical power up to much higher frequencies than more conventional designs.

The diaphragm design includes JBL's exclusive three-dimensional diamond pattern surround' tuned to reduce fatigue inducing stresses in the membrane and support structure. This provides predictable normal resonance modes, and radial reinforcing ribs increase diaphragm stiffness. This diaphragm design combined with the Coherent Wave phasing plug increases the 2451's output in the 5kHz to 20kHz range.

JBL 2451J High Frequency Compression Driver Features:

* 100 watts continuous program power handling when used above 500Hz
* 150 watts continuous program power handling when used above 1kHz
* 500Hz-20kHz response
* 16 ohm impedance
* 111 dB sensitivity (1W/1m on 2352 horn)
* Coherent Wave™ phasing plug design for increased high-frequency output
* 100 mm (4 in) pure titanium diaphragm with radial-rib topology
* 100 mm (4 in) edgewound aluminum voice coil

JBL 2451J High Frequency Compression Driver Specifications:

* Throat Diameter : 1_ inch
* Nominal Impedance : 16 ohms
* Minimum Impedance : 12 ohms @ kHz 5
* DC Resistance : 8.5 ohms +/- 10% @ 25%
* Power Capacity : 100W continuous program above 500Hz; 150W continuous program above 1kHz
* Sensitivity : 111dB SPL, 1 W @ 1 m on-axis on horn; 118dB SPL, 1 mW on plane-wave tube
* Nominal Efficiency : 30 % (500Hz-2.5kHz)
* Frequency Range : 500Hz or higher, 12dB/octave minimum
* Recommended Amplifier Powered : 200W into 8 ohms
* Diaphragm : 0.002 inch (0.05 mm) pure titanium
* Voice Coil Diameter : 4 inch (100 mm)
* Voice Coil Material : Edgewound aluminum ribbon
* Flux Density : 1.9 T (19,000 gauss)
* B1 Factor : 18 N/A
* Diameter : 6- 37/64 inch (167 mm)
* Depth : 3 inch (76 mm)
* Mounting : Four _-20 threaded holes, 90 degree apart on 114 mm (4 1/2in) diameter
* Net Weight : 10 lbs. (4.5 kg)

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