Architectural and engineering specifications

The loudspeaker unit shall be constructed as a line-array of fourteen 6.5" loudspeakers and two coaxially mounted HF compression drivers. The position of the individual transducers shall be according to a special patented scheme.

All signal processing functions, necessary to properly drive a directivity controlled line-array with electronical aiming properties, shall be built into the loudspeaker enclosure.

Electronics shall consist of an audio input module, two input / sixteen output channel DSP, sixteen power amplifiers with protection circuitry (each power amplifier shall drive one loudspeaker) and a switched-mode power supply. There shall be no internal fan(s). The input section shall be transformer balanced. All necessary array signal processing shall be implemented in the digital domain by means of a 900MFLOPS 32bits DSP. The DSP shall realize appropriate output channel filters and delays. Besides theaforementioned, the DSP shall be able to realize EQ, pre-delay, volume and autogain, and compression as required. The DSP software and coefficients shall reside in non-volatile memory in order to facilitate adaptations and software updates.

The control unit shall be equipped with a fully isolated RS-485 based full-duplex serial network interface. This control unit shall serve three main functions:

• Remote monitoring of parameters like status of the DSP, amplifiers and loads, external pilot tone, status of the ambient noise sensing microphone, chassis temperature, ambient noise level etc.
• Remote control of beam parameters, input related parameters, volume, predelay, EQ, autogain configuration and surveillance related parameters.
• Updating DSP software and factory unit programming.

The loudspeaker enclosure shall be constructed of stainless steel finished with an epoxy coating. At the back side of the enclosure a total of two bracket attachment points shall be provided (located near the outer ends). The protective front shall consist of a twopiece perforated steel grill which can be clicked onto eight snap-in studs mounted on the enclosure.

The complete loudspeaker unit shall meet the following criteria:

Typical frequency range of the complete array 140 - 18k Hz on axis (+/- 3 dB), max. SPL at 30 m of 97 dBSPL continuous and 105 dBSPL peak, adjustable vertical beam shape is defined by the DDS (Digital Directivity Synthesis) algorithm, fixed horizontal opening angle of 100° (-6 dB, averaged 1k to 8k Hz).

Dimensions are 3738 mm (147.2") H x 198 mm (7.8") W x 189 mm (7.4") D.

Weight 82 kg (181 lbs).

The enclosure protection shall be IP 55.

The loudspeaker unit shall be the JBL Professional® model Intellivox HP-DS370