H-Isocont Sheet; Input Data; Figure 52: Dv-Dosc Mechanical Data - L-Acoustics dV-DOSC Operator's Manual

Figure 52: dV-DOSC mechanical data

H-ISOCONT SHEET

The H-ISOCONT sheet is used to check horizontal coverage by mapping a projection of the
horizontal isocontour of the defined V-DOSC and dV-DOSC arrays onto the user-defined audience
area. By matching horizontal coverage to the audience area, H-ISOCONT can be used to check array
placement/aiming and stereo imaging as well as determine whether offstage fill, front fill or center
cluster arrays are required. Two audience areas can be defined and the coverage of up to four arrays
displayed (4 x V-DOSC, 4 x dV-DOSC). Calculation assumptions include: 3 dB SPL reduction with
doubling of distance (i.e., arrays have been designed for constant impact spacing using their respective
Cutview sheets); anechoic or reflection-free conditions (direct sound only).

Input Data

Just as for cutview sheets, input data cells are in black and results are displayed in red. To define a plan
view of the audience area, the user inputs x (range) and y (distance off-centre) coordinates in the
Contour 1 and Contour 2 cells. A mirror image drawing scheme is used (so that only half the room
needs to be defined) and after coordinates are entered, the display of the audience area is updated
when the SCALING button is pressed. It is only necessary to define Contour 1, however, Contour 2 is
useful to represent balconies, stage thrusts, proscenium opening, FOH location etc.
When V-DOSC and dV-DOSC arrays are defined (in V-ARRAY1,2 and dV-ARRAY1,2 Cutview sheets
respectively), they are automatically displayed in the H-ISOCONT sheet with the x location of each
array referenced to the defined Offset Distance taken from each arrays' respective Cutview sheet.
The parameter ''Isocontour at Distance (m)'' refers to the throw distance for the top enclosure of the
respective array and is given relative to the defined Offset Distance.
The user then enters the ''Console Output Signal (dBu)'' for each array, i.e., output level of the mixing
desk (0 VU = +4 dBu) and the Continuous A-weighted SPL is tabulated, corresponding to the SPL
that would be obtained along the isocontour for each array. The Console Output Signal can be
increased until the amount of headroom available in the system goes to zero and the user has an
indication as to the peak A-weighted SPL that will be available along the isocontour. Further increases
in the Console Output Signal will produce a CLIP indication reflecting amplifier clip.
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dV-DOSC dV-SUB Manual V3.0 June 2005