FBT 31623FBT TWEETER ΗΧΕΙΟΥ PROJECT 660t

TWEETER PART ASSEMBY FOR PROJECT SERIES, 660t  31623

DIAMETER : 60mm
Hole Diameter : 40.5 mm

150W AES compression driver, 4 διάφραγμα τιτανίου, coherent wave phasing plug, 8Ω

70W AES compression driver, 1.75 διάφραγμα τιτανίου, 16Ω

The model 2426H is a professionalquality high frequency compressiondriver which incorporates JBL'stitanium diamond diaphragm. Thistitanium diamond structure combinesthe ruggedness of phenolic andcomposite-type diaphragms with theoutstanding frequency response offragile aluminum and exotic metaldiaphragms.

JBL's exclusive suspension, consistingof a three-dimensional diamondpattern, reduces bendingstresses in the diaphragm supportstructure. The depth of the diamondpattern is closely controlled toprovide predictable frequencies forthe 2nd and 3rd normal resonancemodes and for the basic suspensionresonance.

The mathematically determinedphasing plug consists of concentricexponential horns to minimize phasecancellations. Phasing plug, throat exittube and diaphragm assemblies areidentical to the previous model.

All cast parts and tolerances are held to the same levels traditionally associated with JBL designs. Additionally the press-fit assembly and interlocking parts assure greater resistance to the mechanical shock. 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. The front snout may be removed(unscrewed) to allow standard 1 3/8" -18 screw mounting. Through holes for external attachment points are also provided. A machined ring of copper surrounds the pole piece to counteract the inductance of the voice coi1 at high frequencies. After manufacture, the frequency response of each driver is tested for conformity to rigid performance standards.

The 2426H is offered in an 8 ohm impedance, and the otherwise identical 2426J is offered in a 16 ohm impedance.

The 2426H features a removable flange to expose a 1 3/8“-18 snout for screw-on type horns.

• Throat Diameter: 25 mm (1 in)


• Nominal Impedance:2426H - 8 ohms2426J - 16 ohms


• Minimum Impedance: 5 ohms (H), 9 ohms (J) @ 5 kHz


• D.C. Resistance: 3.3 ohms (H), 6.5 ohms (J) +/- 10% @ 25C


• Power Capacity:70 W continuous program above 800 Hz100 W continuous Program above 1.2 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


• Nominal Efficiency: 25% (800 Hz to 2.5 kHz)


• Frequency Range: 500 Hz to 20 kHz


• Recommended Crossover4: 800 Hz or higher, 12 dB/octave slope minimun


• Diaphragm: 0.05 mm (0.002 in) pure titanium


• Voice Coil Diameter: 44 mm (1% in)


• Voice Coil Material: Edgewound aluminum ribbon


• Flux Density: 1.8 T (18,000 gauss)


• Bl Factor:6.3 N/A(H)9.3 N/A (J)


• Positive voltage to black terminal gives diaphragm motion toward phasing plug


• Mounting:Three 1/4-20 threaded holes, 120 apart on 57.2 mm

(2-1/4 in) diameterFront snout may be removed (unscrewed) to expose standard 1 3/8 in -18 screw threads

• Dimensions: 149 mm (5 7/8 in) diameter, 104 mm (4 1/8 in) depth


• Net Weight: 4.3 kg (9-1/2 lb)

Driver 2“, 140W, 109dB, 0.5-20kHz, διάφραγμα
τιτανίου, 3.4kg