L-Acoustics Array 2004

Feb 18, 2004 12:00 PM, Editors

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L-Acoustics U.S. has made its Array 2004 available to all of its V-DOSC network partners, independent rep firms, dV-DOSC providers and certified V-DOSC engineers. This software is available for free download by clicking on the V-DOSC NTW Page link at www.l-acoustics.com and entering a confidential password provided by the company.

Array 2004 is a convenient, easy-to-use Excel spreadsheet tool designed to predict the horizontal and vertical coverage of V-DOSC or dV-DOSC line source arrays. By defining the audience geometry (section and plan views), desired number of elements, interelement angles and array trim height, installation parameters, horizontal and vertical coverage, SPL (A-weighted and unweighted), stability of the vertical directivity and mechanical data (array weight, load distribution, center of gravity) can all be determined.

The first four worksheets (V-ARRAY1, V-ARRAY2, dV-ARRAY1, dV-ARRAY2) represent vertical cut views (section elevations) of the audience in the XZ plane and show the intersection of the vertical aiming direction of each loudspeaker element with the audience (impact zones). The site angle for each element is calculated according to the user-input angles, and the impact zones indicate where an individual cabinet's coverage hits the audience area. The resulting cut view shows a pseudo 3-D projection of the coverage of the system onto a section view of the audience. Typically, cut view 1 is used for the main (0 degree) axis of the system, while cut view 2 is used for the offstage axis (45 or 60 degrees for V-DOSC or dV-DOSC, respectively) to determine offstage fill requirements.

The optimization procedure involves varying the array trim height and inter-element angles to obtain constant spacing of element impact zones over the main and offstage cut views, while verifying that sufficient coverage is obtained offstage. The goal is to have equal spacing of element impact zones to satisfy WST Criterion #4. Essentially, cut view sheets are used to shape the vertical coverage of V-DOSC or dV-DOSC arrays to match the audience area and to determine all installation parameters (inter-element angles, trim heights, top/bottom site angles).

The H-ISOCONTOUR sheet displays the horizontal iso contour (continuous A-weighted SPL mapping) of all defined V-DOSC and/or dV-DOSC arrays projected onto a plan view of the audience area in the XY plane. The horizontal iso contour of the system's coverage is used to determine the extent of stereo imaging and check array placement and aiming, as well as to determine whether offstage fill, front-fill or center cluster-fill systems are required. Two audience areas can be defined and the coverage of up to four arrays displayed (2x V-DOSC, 2x dV-DOSC).

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