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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 99Trim and Angle AdjustmentsAt this point there are only two adjustments left - trim height of the array and tilt angle of the entireflown system. If two motors are used for standalone flying, the front motor is used to set the properheight of the whole array. Controlling the tilt angle is then performed by the relative action of thetwo chain-motors, i.e., once the proper height has been set the front motor is fixed and activatingthe rear motor only varies the tilt angle.Note: For dV-DOSC, do not use the top and bottom of the cabinet as a visual reference (as for V-DOSC).The radiated wavefront is parallel to the front of the cabinet and is not defined by the trapezoidal enclosurewalls. Adding a 3.75 degree angle at the rear of the top element allows dV-BUMP to be used as a site anglereference for the top element.Depending on the tools available, there are a number of possible techniques for trimming and anglingthe array. For trim height measurement, one end of a tape measure can be fixed to the lower wall ofthe bottom dV-DOSC element at the front of the enclosure (by using some duct tape). The tapemeasure is then used to raise the array to the proper height (referenced to the floor) based on thebottom element elevation which was pre-calculated using ARRAY 2000. Once the array is at trimand focussed, the tape measure can be pulled free.For angle adjustment, under dark conditions (indoors), a small flashlight can be attached at thejunction between the top and the second elements. The final trim angle adjustment can then bechecked from the rearmost seats of the audience: when the light can be seen through the small gapseparating the first and the second elements, the angle of the array is correct.A more precise technique for far field focus is to use a laser attached to dV-BUMP (provided that a3.75 degree angle is used at the rear of the top dV-DOSC). Trim angle adjustments are then directlygiven by the focus of the laser on the audience (no walking to the back of the venue is requiredalthough a set of binoculars can be useful in locating the laser beam). Obviously, array focus usinglasers is difficult to perform outdoors under daylight conditions.For both alternatives, two pieces of light rope can be run from the floor, one over dV-BUMP andthe other routed through a hole in dV-BUMP. Both lines attach to the Maglite or laser device inorder to pull the instrument free then lower it after measurements have been performed (one stringis a pull line, the other is used to lower the instrument). As a final check, mute mid and low channelsand run pink noise through the system and listen to the high section coverage throughout the venueto verify that installation is correct.Under daylight conditions (outdoors), the trim angle can be visually checked from the rearmostaudience section. If the gap between the top and second elements is clearly visible then the focus iscorrect. At long distances, binoculars can help to visualize this gap and for final angle adjustments, a |
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