JBL 2451H

Compression Driver , 4 inch Ribbed Titanium Diaphragm, Coherent Wave™ Phasing Plug, Neodymium Rare-Earth Magnet Structure, 8 ohms

Product Code: 61873

Retail Price: $1,429.00

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Description

The JBL 2451H/J high frequency compression driver is a 38 mm (1-1/2") exit diameter, compact size and light weight addition to JBL's family of professional quality neodymium compression drivers. 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 20 kHz than previous designs.

The Coherent Wave phasing plug structure has four equal length passages to provide in-phase summation of diaphragm output at the 38 mm 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 5 kHz to 20 kHz range.

High temperature voice coil former materials and adhesives enable the 2451H/J to handle higher power levels over extended periods of time. The voice coils themselves are identical to previous JBL models, so that impedance and network matching will be the same. After manufacture, the frequency response of each transducer is tested for conformity to JBL's rigid performance standards.

2451H/J is ruggedly constructed to withstand the rigors of both fixed installations and touring applications. All tolerances are held to the same high levels traditionally associated with JBL designs. The JBL manufacturing process permits the use of rim centered diaphragms for instant interchangeability and ease of field service. High temperature voice coil former materials and adhesives enable the 2451H/J to handle higher power levels over extended periods of time. The voice coils themselves are identical to previous JBL models, so that impedance and network matching will be the same. After manufacture, the frequency response of each transducer is tested for conformity to JBL's rigid performance standards.

In Depth

100 watts continuous program power handling when used above 500 Hz
150 watts continuous program power handling when used above 1 kHz
8 ohm (H) or 16 ohm (J) impedance
500 Hz to 20 kHz response
111 dB sensitivity (1W/1m on 2380A horn)
Coherent Wave phasing plug design for increased high-frequency output
100 mm (4") pure titanium diaphragm with radial-rib topology
100 mm (4") edgewound aluminum voice coil
Net weight: 4.8 kg (10.5 lbs.)
Throat Diameter: 38 mm (1-1/2")
Nominal Impedance: 2451H 8 ohms , 2451J 16 ohms
Minimum Impedance: 6 ohms (H), 12 ohms (J) @ 5 kHz
DC Resistance: 4.3 ohms (H), 8.5 (J) +/- 10% @ 25°C
Power Rating': 100 W continuous program above 500 Hz; 150 W continuous program above 1 kHz
Sensitivity: 111 dB SPL, 1 W @ 1 m on-axis on horn
118 dB SPL, 1 mW on plane wave tube
Nominal Efficiency: 30% (500 Hz to 2.5 kHz)
Frequency Range: 500 Hz or higher, 12 dB/octave minimum
Recommended Amplifier Powered: 200 W into 8 ohms
Diaphragm: 0.05 mm (0.002 in) pure titanium
Voice Coil Diameter: 100 mm (4")
Voice Coil Material: Edgewound aluminum ribbon
Flux Density: 1.9 T (19,000 gauss)
B1 Factor: 12.7 (H) T m; 18 (J) Tm
Polarity: Positive voltage to black terminal produces diaphragm
motion toward phasing plug
Dimensions: 167 mm (6") diameter
76 mm (3")
Mounting: Four 1/4 - 4-20 threaded holes, 90° apart on 114 mm
(4-1/2") diameter
Net Weight: 4.5 kg (10 lb)

Item Number: JBL 2451H [2451H/J] 61873 0-0

Have a question about the JBL 2451H [2451H/J]?
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