JBL 2446-H, 2446-J Brochure

2446H/JCompression Driver

Professional Series

Key Features:

100 watts continuous program at 500 Hz

150 watts continuous program at 1 kHz and higher

Coherent Wave™ phasing plug design for increased high-frequency output

100 mm (4 in) pure titanium diaphragm with radial-rib topology and patented three-dimensional diamond pattern suspension

100 mm (4 in) edgewound aluminum voice coil

49 mm (2 in) throat exit diameter

The model 2446H/J is a professional quality high-frequency compression driver that incorporates JBL’s newlydeveloped 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.

Specifications:

Throat Diameter: 49 mm (2 in)

Nominal Impedance: 2446H 8 ohms 2446J 16 ohms

Minimum Impedance: 6 ohms (H), 12 ohms (J) @ 5 kHz

DC Resistance: 4.3 ohms (H), 8.5 ohms (J) ± 10% @ 25°C

Power Capacity¹: 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 horn² 118 dB SPL, 1 mW on plane-wave tube³

Nominal Efficiency: 30% (500 Hz to 2.5 kHz)

Frequency Range: 500 Hz to 20 kHz

Recommended Crossover: 500 Hz or higher, 12 dB/octave minimum

Diaphragm: 0.05 mm (0.002 in) pure titanium

Voice Coil Diameter: 100 mm (4 in)

Voice Coil Material: Edgewound aluminum ribbon

Flux Density: 1.9 T (19,000 gauss)

Bl Factor: 12.7 (H) N/A

18 (J) N/A

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.

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

Dimensions:

235 mm (9¼ in) diameter

131 mm (5

in) depth

Mounting:

Four ¼-20 threaded holes, 90° apart on 101.6 mm (4 in) diameter

Net Weight:

13.8 kg (30½ lb)

¹Continuous program is defined as 3 dB greater than continuous pink noise and is a conservative expression of the

transducer’s ability to handle normal speech and music

program

material Continuous pink noise power ratings are tested

with pink noise input having a 6 dB crest

factor, with

a

high-pass

filter set

at

the specified

lower

limiting frequency

for

two

h o u r s d u r a t i o n .

²Sensitivity measured with 1 W input at

1 m

distance

on

axis from the mouth

of

a horn with

a Q of

6.3 averaged in

the 2

kHz

octave band.

³As specified by recognized standards

organizations,

sensitivity is

measured with the driver coupled to a terminated tube.

The JBL sensitivity rating represents the

SPL in a 25 mm (1 in) terminated tube,

using a 1 mW input signal (0.126 V into

16

ohms) swept from 500 Hz to 2.5 kHz. The

sensitivity with

a 1 W

input would be 30 dB greater

JBL continually engages in research related to product improvement. New materials, production methods, and design

refinements are introduced into existing products without notice as a routine expression of that philosophy. For this

reason, any current JBL product may differ in some respect from

its published description

but will always equal or exceed

the original design specifications unless otherwise

stated

¹U.S. Patent #4,324,312. Foreign patents pending.