L-Acoustics dV-DOSC Operator's Manual
Also see for dV-DOSC: Operator's manual
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Contents
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dV-DOSC dV-SUB Manual V2.0 Nov 2001 512. dV-DOSC ARRAY SPECIFICATIONS2.1 ISOCONTOUR IN THE HORIZONTAL PLANEHorizontal Directivity of a dV-DOSC ArrayAccording to AES recommendations, directivity is specified over an angular window with no morethan 6 dB deviation. For the case of dV-DOSC, the -6dB points are at +/- 60° off axis and thehorizontal directivity pattern is strictly symmetrical with respect to the 0° axis - a direct consequenceof coplanar symmetry. Horizontal directivity of a dV-DOSC array is independent of the number ofarrayed elements and the vertical configuration of the array. Horizontal coverage for the entirearray remains equal to the directivity of a single dV-DOSC element, i.e., 120° from 1k - 10k Hz.To summarize, any dV-DOSC array has a constant horizontal coverage angle of 120° in thehorizontal plane from 1000 to 10,000 Hz with -6dB points at +/- 60° off-axis.Effective Coverage in the Horizontal PlaneIn practice, strict adherence to polar specifications does not reflect the effective coverage of a soundsystem when it comes to the real world. Although a dV-DOSC array is in fact radiating 6 dB less at60° off-axis, this is generally not acceptable for most sound engineers (and audiences). A SPL windowof 3 dB is more acceptable for defining the coverage of a system with constant distance. For a dV-DOSC array of arbitrary height, the –3 dB coverage window is 100° from 1k to 10 k Hz.For sound design purposes, we will use a concept that takes into account the relative distance fromthe array, at different angles, having the same SPL. These isobaric (constant SPL) curves, orisocontours, are obtained by re-formatting polar curves on a linear scale. The horizontal projectionof the isocontour can then be used directly to predict the effective coverage of a dV-DOSC array inthe horizontal plane. By overlaying the isocontour on the blueprints of a venue, the sound designercan adjust the main axis of the array to get the best results for a given audience layout.The horizontal isocontour for dV-DOSC is averaged from 1-10 kHz since the directivity of the arrayremains constant over this frequency range. This also gives good consistency over what we call theclarity or intelligibility range. For lower frequencies, the isocontour is not preserved and becomesmore omnidirectional as the directivity decreases at lower frequencies.For simulation purposes, L-ACOUSTICS provides horizontal isocontour data (see sheet H-ISOCONTOUR in the ARRAY spreadsheet). For further details on how to use this data in arraydesign please see Section 2.3. |
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