BMS BMS4507NDL 4507 NDL – 6.5″ Neodymium high-frequency Driver 150 W 8 Ohms

Features:

• Dual Diaphragm Coaxial Planar Wave Design (patent pending)
• Rectangular piston of 6.5" x 3/4" (162 x 19 mm)
• Neodymium Magnet Assembly
• Perfect acoustical coupling of individual units to create virtually continuous line source
• Extended Bandwith (400 - 22,000 Hz)
• With two Subsystems in one, each Driver covers a smaller Frequency Range for increased Power Handling, high Dynamic and extremely low Distortion
• Excellent Phase Coherence
• Perfect Time Alignment without Problems of Multi-Source Interference
• Ultra light Weight and small Size

The BMS 4507ND dual diaphragm coaxial planar wave driver radiates a coherent planar wave front form a rectangular piston without internal diffraction for superior dispersion control and high fidelity sound.

The driver is in fact a 2-way system employing two concentric annular ring diaphragms. Each driver covers a smaller frequency range for increased power handling, high dynamic and extremely low distortion.

This distinctive new transducer was engineered to work with 6.5-inch (162 mm x 19 mm) rectangular throat waveguides providing extremely high sensitivity.The patented design of the BMS 4507ND is a result of extensive dedicated research and development providing dramatic improvement in dynamic response, clarity and transparency. The larger annular midrange diaphragm covers the frequency range between 400 and 6,500 Hz with a smooth, linear response.

The high diaphragm excursion of max. + / - 0.8 mm results in high output and increased power handling up to 1,300 W peak.The ultra light annular diaphragm for the high range offers exceptional transient response with very high efficiency from 6 to 22 kHz.

The voice coils may be driven in conjunction with a passive crossover or driven individually from an active crossover.The unique voice coil technology employs a light weight Copper Clad Aluminum wire wound inside and outside of the Kapton™ former to improve the heat dissipation, dramatically increasing the acoustic output and reliability of the driver while minimizing the power compression. The use of high grade neodymium magnets provide improved performance while significantly reducing transducer weight.

The 4507ND is optimized for 0° to 15° vertical dispersion and allows a horizontal coverage up to 120° depending on the waveguide used.The unique design of the 4507ND dual diaphragm planar wave driver allows perfect acoustical coupling of individual units with excellent phase coherence and perfect time alignment to create virtually continuous line source.

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)