JBL 2142-H Brochure

300 mm (12in)

Professional Series

Key Features:

New 44 mm (1.75 in) Pure Titanium Dome High Frequency Transducer

Frequency Range (- 10 dB):

60 Hz - 22 kHz

Sensitivity: 97 dB SPL 1 W,

1 m (3.3 ft)

Power Capacity: 90 W IEC

Pink Noise

Bi-Amplifier Terminals

Integral Transformer Mounting Bracket

The JBL 2142H Coaxial Transducer represents the results of JBL’s intensive research into the performance and applications of coaxial transducers intended for engineered sound applications. To achieve maximum power handling while maintaining wide bandwidth and consistent dispersion in several critical HF octave bands, JBL engineers developed a new size and configuration

44 mm (1.75 in) high-frequency transducer, incorporating a pure titanium dome with JBL’s patented “diamond surround” for control over secondary resonances.

The low frequency driver combines a rugged die-cast frame with a specially designed cone and 51 mm (2 in)

voice-coil motor structure that ope-

rates in tandem with the HF element to sustain smooth system response and stable dispersion through the crossover region.

An integral transformer mounting bracket, built-in provisions for quick bi-amplifier hookups, and a special snap-off network access cover are all designed to reduce contractor fabrication time in the shop and installer placement time at the site.

In response to consultant and con-

tractor requests, the JBL 2142H was

designed to perform well in the most commonly-specified utility metal enclosure and baffle combinations, despite the generally detrimental acoustical properties of those enclosures. Custom-build boxes will usually result in better performance characteristics than those published here.

2142H

Coaxial Transducer

Preliminary Specifications:

SYSTEM:

Frequency Range ( - 10 dB):60 Hz - 22 kHz

Power Rating

Sensitivity

Nominal Impedance: 8 ohms

Crossover Frequency: 2.7 kHz

LOW FREQUENCY TRANSDUCER:

Nominal Diameter:300 mm (12 in)

Voice Coil Diameter: 51 mm (2 in)

Magnet Weight:1.1 kg (2.4 lb)

Sensitivity

HIGH FREQUENCY DOME RADIATOR:

Nominal Diameter:

Voice Coil Diameter:44 mm (1.75 in)

Magnet Weight: 0.54 kg (1.2 lb)

Sensitivity

Dispersion Angle

GENERAL:

Input Terminations:2 x 2 barrier strip with removable jumpers to

Transformer Mounting:Integral mounting plate on LF frame

Recommended Enclosure Volume:3 cu ft

System Net Weight:5.5 kg (12 lb)

(1) Rating based on test signal of filtered random noise conforming to the international standard IEC 268-1 (pink noise with 12 dB per octave rollof below 40 Hz and above 5000 Hz with a peak-to-average ratio of 6 dB), 2 hours duration.

(2) Averaged from 500 Hz to 2.5 kHz

(3) Averaged from 100 Hz to 500 Hz

(4) Averaged from 2 kHz to 10 kHz (5) Included by -6 dB down points, averaged between 1 kHz and 10 kHz

:90 W continuous pink noise

:97 dB, 1 W (2.83 V), 1 m (3.3 ft)

:93 dB, 1 W (2.83 V), 1 m (3.3 ft)

50 mm (1.95 in)

98 dB, 1 W (2.83 V), 1 m (3.3 ft)

: 80° Nominal

Polarity:Positive voltage to ( + ) terminal on network

input gives forward L.F. cone motion

permit bi-amplification

2142H 300 mm (12 in) Coaxial Transducer

THIELE/SMALL PARAMETERS:

F,:

72 Hz

5.2 ohms

Q,,:

0.92

V,,: 45 1(1.6 ft3)

S,:

0.055 m2 (85.25 in2)

G,;,:

6.4 mm (0.25 in)

V,:

352 cm3 (21.2 in3)

0.85 mH

(Half space): 1.82%

P, (Max): 100 W

MOUNTING INFORMATION:

Overall Diameter: 311 mm (12¼ in)

Bolt Circle Diameter: 294 mm (11 9/10 in)

Baffle Cutout Diameter (rear mount):

280 mm (11 1/16 in)

Baffle Cutout Diameter (front mount): 279 mm (11 in)

JBL continually engages in research related to product improvement. New materials, pro-

duction 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

Frequency Response, 1 W at 1 m; Impedance

JBL Professional

8500 Balboa Boulevard, P.O. Box 2200 Northridge, California 91329 U.S.A.

)II

A Harman International Company

SS 2142H CRP 5M 10/96