(2-1/4 in) diameterFront snout may be removed (unscrewed) to expose standard 1 3/8 in -18 screw threads Mounting:Three 1/4-20 threaded holes, 120 apart on 57.2 mm.Positive voltage to black terminal gives diaphragm motion toward phasing plug.Voice Coil Material: Edgewound aluminum ribbon.Diaphragm: 0.05 mm (0.002 in) pure titanium.Recommended Crossover4: 800 Hz or higher, 12 dB/octave slope minimun.Nominal Efficiency: 25% (800 Hz to 2.5 kHz).Sensitivity:107 dB SPL, 1 W 1 m, JBL 2344A horn110 dB SPL, 1 W 1 m, JBL 2370A horn117 dB SPL, 1 mW on plane wave tubes.Power Capacity:70 W continuous program above 800 Hz100 W continuous Program above 1.2 kHz.Minimum Impedance: 5 ohms (H), 9 ohms (J) 5 kHz.Nominal Impedance:2426H – 8 ohms2426J – 16 ohms.The 2426H features a removable flange to expose a 1 3/8“-18 snout for screw-on type horns.
The 2426H is offered in an 8 ohm impedance, and the otherwise identical 2426J is offered in a 16 ohm impedance. After manufacture, the frequency response of each driver is tested for conformity to rigid performance standards. A machined ring of copper surrounds the pole piece to counteract the inductance of the voice coi1 at high frequencies. Through holes for external attachment points are also provided. The front snout may be removed(unscrewed) to allow standard 1 3/8″ -18 screw mounting. Diaphragm assemblies are rim centered rather than pin mounted, for instant interchange ability and ease of field service.Mounting is provided for standard25 mm (1 in) three bolt pattern. Additionally the press-fit assembly and interlocking parts assure greater resistance to the mechanical shock. Phasing plug, throat exittube and diaphragm assemblies areidentical to the previous model.Īll cast parts and tolerances are held to the same levels traditionally associated with JBL designs. The mathematically determinedphasing plug consists of concentricexponential horns to minimize phasecancellations. The depth of the diamondpattern is closely controlled toprovide predictable frequencies forthe 2nd and 3rd normal resonancemodes and for the basic suspensionresonance. JBL’s exclusive suspension, consistingof a three-dimensional diamondpattern, reduces bendingstresses in the diaphragm supportstructure. Thistitanium diamond structure combinesthe ruggedness of phenolic andcomposite-type diaphragms with theoutstanding frequency response offragile aluminum and exotic metaldiaphragms. The model 2426H is a professionalquality high frequency compressiondriver which incorporates JBL’stitanium diamond diaphragm.
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