Martin LIGHTING DIRECTOR User Manual download pdf (Page 25)

AUTOMATIC CALIBRATION is the most common method for setting up the

tracking system. This method entails measuring the distances, in centimeters (or inches,

if those are the units that have been selected), between the five gaffer-tape stage-

markings and then using the tracker to correlate those distances to actual speaker

positions. Measure the distances between the stage marks indicated on the screen, six

in total, and enter them in centimeters (or inches) in the appropriate fields (The label

“D14” means the distance from point 1 to point 4, an similarly for D13, DC1, DC2,

D23, D24). Appendix I has a template that may help you record calibration data. Once

you have entered the data, you can press the “Point #1” button, which will start MLD

tracking, and take the tracker microphone to the floor just above the gaffer-tape stage-

marking number 1, which is the upstage centre mark. The tracker microphone should

be pointing up and have a clear line of sight to all four speakers.

IMPORTANT NOTE: If the tracker does not seem to update during stage-mark

measurement, for example if it is showing zero vales or a static number, adjust the

volume on the radio receiver.

Once the readings are steady on the tracking screen, you should press “Accept”. Next,

do the same for points 2, 3 and 4, which correspond to the downstage centre, stage

right and stage left gaffer-tape markings. Finally, select the “Use Automatic” button to

calculate the speaker locations. At this point, the fields in the manual irregular zone at

the bottom of the screen will show approximations of the position of each speaker in

the XYZ coordinate system.

Now that you have calibrated your speakers you may press OK to exit the speaker set-

up screen. Click OK again to exit the set-up screen. You will now see the five stage

markings appear on your editor window at their relative positions. The four calibration

points are numbered from 1 to 4 as in the set-up screen. You will see an “interactive

perimeter” surrounding the stagemarks: this rectangle defines the area where tracking

will take place.

Side note: when you press the “Use Automatic” button, the software finds the speaker

positions in three-dimensions by mathematically relating the distances between the stage marks

and the tracker measurements. The precision of these measurements will become the accuracy

of the whole system. If the information collected by the tracker produces an impossible speaker

coordinate, the software will produce a warning message. When this happens, you should try

measuring the stage marks again with the tracker. If this problem persists it might be because

the tracker does not receive pulses from all four speakers and new stage-marks in slightly less

obstructed positions need to be used. Alternatively, you can use the stage-marks but measure

them at a fixed height above the floor, as discussed in the next side note (at the end of this

chapter).

MANUAL REGULAR CALIBRATION is normally the fastest method to set up

the tracking system. However, it can only be used when the four speakers have been

positioned at exactly the same height above the stage and are at perfect right angles to

each other, i.e. the speakers form a regular square or rectangle. If this is so, simply

enter the width (distance from speaker A to B or from C to D), depth (distance from

speaker B to C or from A to D) and height (distance from the stage floor to the

speakers) in the appropriate fields, in centimetres (or inches if those are the units

selected). Select the “Use Manual Regular” button to calculate the speaker positions

using the values you have entered. Press OK to exit the speaker set-up screen. Click

OK again to exit the set-up screen. If you use the Manual Regular Calibration the editor

window will show an interactive perimeter which is the speaker area that you entered.

MLD manual 1.1 Page 25

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Martin LIGHTING DIRECTOR User Manual Page 25

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