Martin LIGHTING DIRECTOR Owner's Manual download pdf (Page 11)

Martin Lighting Director 2.0 Page 11

6. The trackers should never cross the imaginary surface formed by the

four speakers. For example, setting the four speakers at a height of 1.60

m would be very risky because the tracker could easily move under or

over that height and cross this imaginary plane (plus you would prob-

ably have problems related to issues 1 and 4 above). When the plane is

crossed the tracking system is turned inside out and erratic behaviour is

observed.

7. While the MLD has a robust echo detection and rejection system, it is

advisable to mount the speakers away from walls when possible to

avoid echoes bouncing off the walls and causing pulse detection prob-

lems. Under ideal circumstances, mount speakers 3 or more metres (10

feet) away from each wall. Mounting speakers in corners is particularly

bad; if it is not possible to be 3 metres (10 feet) away from all walls, it is

better to position them closer to the centre of the room away from the

corners.

8. Please note that the following issue is NOT as important as issue

number 1, above. A speaker should be tilted so that it is pointing to the

farthest point in the interactive area that its pulses will have to reach.

The reason for this is that the speaker’s sound emission is not uniform

and we want the region of strongest radiation (along an axis directly out

from the centre of the speaker) to be pointing where it will need to travel

most. Again, issue number 1 in this section is much more important than

this issue.

Speaker calibration

The software must know the precise 3D location of the four speakers

with respect to the centre of the stage; this is called “calibrating the

speakers”. There are three ways to do it: automatic, manual regular and

manual irregular.

Automatic speaker calibration

Automatic calibration is the most common method for setting up the

tracking system. This method entails measuring the distances between

five gaffer-tape stage-marks and then using the tracker to correlate those

distances to actual speaker positions.

Mark the centre of your stage with some gaffer tape. This will be the

central reference point for the tracking system, also called the origin.

Page 14 Getting Started

Press the “Apply” button to calculate the speaker positions using the

values you have entered. 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 may override these suggestions by

manually entering a different area, but make sure that the area will have

ultrasonic coverage by all four speakers.

Manual irregular speaker calibration

Manual irregular calibration should be used only if for some reason

automatic calibration is not possible and the speakers are not in a

“regular” configuration (not at right angles to each other or not at the

same height from the stage floor). To use the manual irregular method

you must measure the exact position in centimetres of each speaker

relative to the origin, which is the centre stage mark.

By convention:

• At the origin the X, Y and Z are zero.

• X is the stage width, with positive values towards stage left and

negative values towards stage right.

• Y is the stage depth, with positive values towards upstage and negative

values towards downstage.

• Z is the stage height, with positive values above the stage floor.

Once you have entered all twelve distances press the “Apply” button to

use those values to register the speaker positions. 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 may override these

suggestions by manually entering a different area, but make sure that the

area will have ultrasonic coverage by all four speakers.

Downstage

Upstage

Stag

Left

MLD coordinate system

Stag

Right

-Y

-X

1 2 ... 6 7 8 9 10 11 12

Comments to this Manuals

No comments

Martin LIGHTING DIRECTOR Owner's Manual Page 11

Comments to this Manuals

Related products and manuals for Floodlights Martin LIGHTING DIRECTOR