Martin LIGHTING DIRECTOR User Manual download pdf (Page 77)

CHAPTER 8 - Tips to optimize

system performance

Chapter 2 presented the speaker positions for ideal MLD tracking. In real life it is

sometimes impossible to set speakers on the corners of the stage, at the same height,

and at right angles to each other, because movable trusses, large props, screens or

curtains may block some speakers and deteriorate or stop tracking. In this section we

will cover alternative locations for the MLD speakers.

First, here is the terminology we use:

Stage area —the actual physical stage where the performance or presentation is

taking place. It may or may not be completely covered by the interactive area.

Interactive area —the region where tracking is to take place, defined by the

interactive perimeter. In fact this really refers to an interactive “volume” because the

height of the tracker must be considered also.

Speaker area —the area defined by the speakers on the floor when they are seen

from on top (from a bird’s eye view). The speaker area may or may not surround the

interactive area.

SPEAKER POSITIONING

The main issues concerning speaker placement are as follows:

1. Ultrasonic coverage: the whole area of the stage where tracking is to take place

—the so-called “interactive area”— should receive pulses from all four speakers. MLD

speakers have a radiation angle of approximately 80º, so the interactive area should be

within the four “cones” of ultrasound generated by the speakers.

Figure 42 - Ultrasonic speaker radiation cone.

beam edge

speaker

80°

line of best radiation

MLD manual 1.1 Page 77

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Martin LIGHTING DIRECTOR User Manual Page 77