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Horizontal 1/3 Octave Polars
Architectural Specifications:
The loudspeaker shall consist of a 250 mm (10 in) low frequency
transducer, a coaxial 125 mm (5 in) mid frequency transducer with a
25 mm (1 in) compression driver, and frequency dividing network. The
low frequency driver’s voice coil shall be 50 mm (2 in) in diameter and
the mid frequency driver’s voice coil shall be 25 mm (1 in) in diameter.
Performance specifications of a typical unit shall be as follows:
Usable frequency response shall extend from 38 Hz to 17 kHz (10 dB
below rated sensitivity, half-space, no external equalization). Rated
power shall be at least 500 watts continuous program power for 100
continuous hours duration (defined as 3 dB above a test signal of fil-
tered random pink noise conforming to IEC268-5). Measured sensitivity
shall be at least 93 dB-SPL (at 1m [3.3 ft] with 2.83V input, avg. 100 Hz
to 10 kHz).
The input shall be switchable for use either at nominal 4 ohms, or
on a 70.7V or 100V distributed speaker line via built-in transformer.
Selectable taps shall nominally be 150W, 75W, or 38W on a 70.7V or
100V distributed line, plus 19W on 70.7V line only.
The system shall be protected against damage from occasional over-
powering via full range limiting, which shall be inaudible during
activation. The coaxial mid-high driver shall be horn loaded to cover
120 degrees horizontal by 110 degrees vertical with a high degree of
accuracy.
The cabinet shall be molded High Impact PolyStyrene (HIPS) with
ten percent glass fill, and a 5 mm internal foamed polyurethane
secondary mold. The grille shall be backed by multi-layer foam and be
secured via screws to keep it in place when facing downward. The
cabinet and grille shall be paintable.
The low frequency transducer shall have a neodymium magnet, a
cone of woven fiberglass and Kevlar
®
and butyl rubber surround, with
the frame protected from direct weather exposure. The mid frequency
transducer element of the coaxial mid-high driver shall have an
anodized aluminum cone with an EPDM rubber (a Terpolymer of
Ethylene and Propylene) surround, with the frame protected from
direct weather exposure. The compression driver shall be constructed
with a titanium diaphragm for weather resistance. The coaxial mid-high
driver shall be protected with a secondary acoustically transparent
screen. The system shall withstand Mil Spec 810 testing with specified
durations with no effect on its acoustical performance or structural
integrity; salt spray (method 509.3), temperature (method 501.3 and
502.3), humidity (method 507.3) and ultraviolet (method 505.3).
Further, it shall pass Mil-Std-202F (method 101D) for salt spray. They
system shall have an IEC 529 splashproof rating of IP-X5.
For theft deterrence, the installation access area shall be hidden
behind a snap-out cover on the front grille. The included ball mecha-
nism shall be internal to the cabinet. The cabinet shall have ten (10)
6 mm mounting points including 3 on each side and 3 on top and
bottom and an accessory U-bracket shall be available. The grille logo
shall be rotatable for proper orientation with loudspeaker mounted
horizontally or vertically.
The external wiring connectors shall be screw-down terminals.
Overall cabinet dimensions shall be no greater than 593 high x
372 mm wide x 345 mm deep (23.3 x 14.6 x 13.5 in) and shall weigh
no more than 18.9 kg (42 lb). The finish shall be lightly textured black
or white.
The system shall be the JBL Model Control 30 (or Control 30-WH)
with included InvisiBall
®
(mounting system).
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