1.5 System Descriptions
1. Audio - The audio system shall comprise a Line Array speaker system driven by matched
brand amplifiers. A digital snake system shall provide audio to a digital console. Outputs
of the digital console shall provide analog and digital paths to the amplifiers through DSP.
The DSP shall allow operation in a fully manual mode and a “simple mode” that provides
unattended audio functionality for basic presentations.
a. The system shall consist of a 2-way passive loudspeaker and a passive low-end
extension driven and protected by a dedicated amplified controller.
The loudspeaker shall feature two 6.5-in drivers in a bass-reflex tuned enclosure for
the low section and a 1.5-in diaphragm compression driver coupled to a DOSC® for
the high section. The loudspeaker shall be rated at a nominal impedance of 8 ohms.
The low-end extension shall feature a single 12-in transducer in a tuned dual-chamber
bass-reflex enclosure. The loudspeaker shall be rated at a nominal impedance of 8
ohms. The usable system bandwidth shall be 80 Hz to 20 kHz (-10 dB). When
operating with the low-end extension, usable bandwidth shall be extended down to 50
Hz.
The V-Shape coplanar transducer configuration generates polar pattern coverage of
100° horizontally (-6 dB points) with symmetric pattern control across the projection
axis, with no conflicts over the entire frequency range. The system shall generate a 15°
vertical directivity in a single mode. In line source mode, the vertical directivity is
dependent upon the number of enclosures and inter-element angles. The system shall
be curved up to a maximum of 15° (0° to 15°) for each element without breaking the
inter-element acoustic coupling. The low-end extension generates an omni-directional
coverage pattern.
The loudspeaker maximum peak SPL, measured at 1m under free field conditions
using 10 dB crest factor pink noise, shall be 130 dB. The long term RMS handling
capacity shall be 120 W at nominal 8-Ohms impedance. The low-end extension
maximum peak SPL, measured at 1m under half space conditions using 10 dB crest
factor pink noise, shall be 129 dB. The long term RMS handling capacity shall be 310
W at nominal 8-Ohms impedance.
Enclosure cabinet construction shall be made from a unique composite material with
mechanical and acoustic properties very similar to Baltic birch plywood with the
added benefit of a high immunity to moisture. Dimensions shall be 520 mm (20.5 in)
width, 175 mm (6.9-in) height at the front, 103 mm (4.1 in) height at the rear and 358
mm (14.1 in) depth. The front of the enclosure shall be protected by a plastic grill
covered with acoustically-transparent fabric. Enclosure weight shall be 13 kg (28.6
lbs).
The low-end extension enclosure construction shall consist of Baltic birch plywood.
Dimensions shall be 520 mm (20.5 in) width, 353 mm (13.9 in) height at the front, 280
mm (11 in) height at the rear and 358 mm (14.1 in) depth. The front of the enclosure
shall be protected by a sandblast-coated steel grill covered with acoustically-
transparent fabric. Low frequency extension weight shall be 19 kg (41.9 lbs).
(16 Seiten)
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