Martin LIGHTING DIRECTOR Owner's Manual download pdf (Page 12)

Page 12 Getting Started

Make four other markings: the centre-edge of your stage downstage

(close to the public), the centre-edge of your stage upstage (far from the

public) and the centre-edge of the stage’s right and left wings, as you

stand on the stage facing the public.

Tip: even if your public surrounds the stage or if you do not have a

specific place for the public, you must choose some points that will

define your interactive area and its orientation. These points will serve

as a reference when you are using the MLD software to define regions of

your stage. For convenience, if there is no clear stage orientation, set

the “downstage” of the stage to be the side that is closest to the MLD

computer so that the orientation of the space matches the orientation

presented in the MLD software’s map editor.

Measure the distances between the stage marks indicated on the screen,

six in total, and enter them in centimetres (or inches if those are the

units selected in the preferences) in the appropriate fields. Once you

have entered the data, you can press the red “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 mark. The

tracker microphone should be pointing up and have a clear line of sight

to all four speakers.

Once the readings are steady on the tracking screen, you should press

“Save”. Next, do the same for points 2, 3 and 4, which correspond to the

stage left, downstage, and stage right gaffer-tape markings.

Finally, press the “Calculate” button to find the speaker locations. Note

that the system will automatically fill-in the “interactive area” fields as

it suggests what area is bound to have good ultrasonic coverage. You

Public

Downstage

Upstage

Stage

Left

centre stag

mark

upstage mark

Stage terminology and system calibration markings

Stag

Right

downstage mark

stage lef

mar

tage right

ark

Martin Lighting Director 2.0 Page 13

may override these suggestions by manually entering a different area,

but make sure that the area will have ultrasonic coverage by all four

speakers.

Stagemarks, Alternatives

When you press the “calculate” button to do an automatic speaker

calibration, 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 co-ordinate, 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

should be used.

If props or other obstructions make it impossible to measure the distance

between stage marks or to have tracking take place right above the

markings on the floor, it is possible to measure the points at a fixed

height from the floor. For example, suppose you can only track at a

height of one meter and a half: a) take a measuring tape or a measured

plumb bob and use it to find the tracker at exactly that height over the

markings, b) enter the number 150 in the field right above the calculate

button, c) now you may press the calculate button.

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

stage-mark measurement, for example if it is showing zero values or a

static number, press the signal adjustments button and adjust the volume

on the radio receiver.

Manual regular speaker calibration

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 1 to 2 or from 3 to 4), depth (distance from speaker 2 to 3 or

from 1 to 4) and height (distance from the stage floor to the speakers) in

the appropriate fields, in centimetres (or inches if that’s selected).

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Martin LIGHTING DIRECTOR Owner's Manual Page 12

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