Dynacord COBRA-4 TOP Руководство по эксплуатации онлайн [7/16] 777822

5. AIMING

The maximum possible on-axis sound pressure level is achieved through the simple stacking or flying in a

straight line of from 2 to 4 COBRA TOPs. Since, however, doubling the number of tops halves the vertical

dispersion angle, when setting up using up to the maximum of 4 tops, particular attention must be paid to the

way the entire stack is aimed.

Angle of dispersion

NOTE: 1 x COBRA TOP: horizontal 120° vertical 30°

2 x COBRA TOPs stacked vertically horizontal 120° vertical 15°

4 x COBRA TOPs stacked vertically horizontal 120° vertical 7.5°

The following illustrations show the directivity of a stack of four COBRA TOPs in relation to a FOH position

at a distance of 20 metres with various arrangements of the speakers.

Figure 07

With a straight or stacked arrangement at a height of around 3 to 4 metres the main axis of radiation passes

over the head of the listener

(see fig.07).

Figure 08

If we now incline the entire stack of 4 enclosures 2 – 3° downwards there is a gain of around + 6 dB in sound

pressure levels at the FOH position.

(see fig. 08)

The measurements have been done with a line array from omnidirectional point sources with isophase

characteristics.