Horizontal 1/3 Octave Polars
Architectural Specifications:
The loudspeaker shall consist of a 90 mm (3-1/2 in) low frequency
transducer, 13 mm (1/2 in) high frequency transducer, and frequency
dividing network installed in a ported enclosure. The low frequency
voice coil shall be 19 mm (3/4 in) in diameter.
Performance specifications of a typical production unit shall be as fol-
lows: Measured sensitivity (SPL at 1 m [3.3ft] with 2.83V input, averaged
from 500 Hz to 1.5 kHz) shall be at least 86 dB-SPL. Usable frequency
response shall extend from 85 Hz to 22 kHz (10 dB below rated sensitiv-
ity, in half-space, with no external equalization). Nominal impedance
shall be 8 ohms. The frequency dividing network shall have a crossover
frequency of 3.5 kHz. Rated power capacity shall be at least 50 watts
continuous program power, defined as 3 dB above a test signal of fil-
tered random noise conforming to international standard IEC268-5
(shaped pink noise with a peak-to-average ratio of 6 dB), for 100 contin-
uous hours duration.
The system shall be protected against damage from occassional over-
powering via full range series lamps that limits the power to the net-
work and transducers. The high frequency transducer shall be horn-
loaded to more evenly cover a nominal 90° horizontal by 90° vertical
area.
The enclosure shall be constructed of high-impact polystyrene for pro-
tection against the elements in outdoor applications, and for paintability.
The grille shall be completely zinc-coated for resistance against rusting,
shall be bake-painted black, and shall be secured via screws to keep it
in place when facing downward.
The low frequency transducer shall have a polypropelene cone and a
butyl rubber surround which shall extend seamlessly over the edge of
the speaker frame for protection against the elements. The high frequen-
cy transducer shall be constructed of polycarbonate, reinforced with a
titanium film for additional weather resistance. The system shall with-
stand Mil Spec 810 testing with specified time durations for exposure to
the following environments with no effect on its acoustical performance
or structural integrity: salt spray (method 509.3), temperature -19°C to
49°C (method 501.3 and 502.3), 95% humidity (method 507.3) and
ultra-violet (method 505.3). The system shall have a IEC 529 splashproof
rating of IP-X4.
For theft deterrence, the installation access area shall be hidden
behind a snap-out cover, and the access area shall be on the front of the
loudspeaker for ease of installation and adjustment. The loudspeaker
shall be rotatable over a minimum of ±35° in all directions via a ball-
type mounting system. The ball mechanism shall be internal to the cabi-
net to allow low-profile mounting and better stability via a short moment
arm. The logo shall be rotatable for proper orientation when the loud-
speaker is mounted horizontally or vertically.
The external wiring connectors shall be spring loaded and gold plat-
ed, and shall accept bare wire, single or dual banana-type connectors
with 19 mm (3/4 in) spacing. Overall cabinet dimensions shall be no
greater than 193 mm (7.6 in) high by 140 mm (5.5 in) wide by 111 mm
(4.4 in) deep and shall weigh no more than 1.8 kg (4 lbs).
The finish shall be a paintable lighly textured black.
The system shall be the JBL Model Control 23 with included
Invisiball
®
mounting system.
