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The model 2446H is a professional quality high-frequency compression driver that incorporates JBL's newly-developed Coherent Wave phasing plug as well as a pure titanium diaphragm with radial ribs and patented three-dimensional diamond pattern suspension. The Coherent Wave phasing plug assembly consists of four die-cast annular aperture structures of constant path length to provide m-phase combining of diaphragm output at the driver's exit. This optimized configuration allows coherent summation of acoustical power up to much higher frequencies than afforded by earlier designs. The diaphragm design includes JBL's exclusive three-dimensional diamond pattern surround1 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. The diaphragm also incorporates a series of embossed radial reinforcing ribs that increase diaphragm stiffness. This diaphragm, when combined with the Coherent Wave phasing plug, increases the 2446H/J's output in the 5 kHz to 20 kHz range.

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JBL 2446H High Frequency Compression Driver Features:

100 watts continuous program at 500Hz150W continuous program at 1kHz and higherCoherent WaveTM phasing plug design for increased high-frequency output100mm (4 in) pure titanium diaphragm with radial-rib topology and patented three-dimensionaldiamond pattern suspension100 mm (4 in) edgewound aluminum voice coil49mm (2 in) throat exit diameter

JBL 2446H High Frequency Compression Driver Specifications:

Positive voltage to black terminal gives diaphragm motion toward the phasing plugDimensions: 235mm (91/4 in) diameter131mm (5 in) depthMounting: Four 1/4-20 threaded holes, 90° apart on 101.6 mm (4 in) diameterNet Weight: 13.8 kg (301/2 lb)Specifications:Throat Diameter: 49 mm (2 in)Nominal Impedance: 2446H 8 ohms2446J 16 ohmsMinimum Impedance: 6 ohms (H), 12 ohms (J) @ 5 kHzDC Resistance: 4.3 ohms (H), 8.5 ohms (J) ± 10% @ 25°CPower Capacity1: 100W continuous program above 500Hz150W continuous program above 1kHzSensitivity: 111dB SPL, 1 W @ 1 m on-axis on horn2118 dB SPL, 1 mW on plane-wave tube3Nominal Efficiency: 30% (500Hz-2.5kHz)Frequency Range: 500Hz to 20kHzRecommended Crossover: 500Hz or higher, 12dB/octave minimumDiaphragm: 0.05 mm (0.002 in) pure titaniumVoice Coil Diameter: 100 mm (4 in)Voice Coil Material: Edgewound aluminum ribbonFlux Density: 1.9 T (19,000 gauss)Bl Factor: 12.7