Data Sheet

2142H
300 mm (12in)
Coaxial Transducer
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 inten-
sive research into the performance
and applications of coaxial trans-
ducers intended for engineered
sound applications. To achieve maxi-
mum power handling while main-
taining wide bandwidth and consis-
tent dispersion in several critical HF
octave bands, JBL engineers devel-
oped a new size and configuration
44 mm (1.75 in) high-frequency trans-
ducer, 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 spe-
cially 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 fabrica-
tion 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 enclo-
sures. Custom-build boxes will usually
result in better performance charac-
teristics than those published here.
Preliminary Specifications:
SYSTEM:
Frequency Range ( - 10 dB):60 Hz - 22 kHz
Power Rating
1
:90 W continuous pink noise
Sensitivity
2
:97 dB, 1 W (2.83 V), 1 m (3.3 ft)
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
3
:93 dB, 1 W (2.83 V), 1 m (3.3 ft)
HIGH FREQUENCY DOME RADIATOR:
Nominal Diameter:
50 mm (1.95 in)
Voice Coil Diameter:44 mm (1.75 in)
Magnet Weight: 0.54 kg (1.2 lb)
Sensitivity
4
98 dB, 1 W (2.83 V), 1 m (3.3 ft)
Dispersion Angle
5
: 80° Nominal
GENERAL:
Polarity:Positive voltage to ( + ) terminal on network
input gives forward L.F. cone motion
Input Terminations:2 x 2 barrier strip with removable jumpers to
permit bi-amplification
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