Dynacord COBRA-4 Посібник користувача Посібник користувача - Сторінка 7
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- 1. Table of Contents
- 2. General
- 3. Cobra System / Cobra-4 System
- 4. Setting up
- 5. Tips on Setting up
- 6. Aiming
- 7. Cobra System Configurations ( Sub / Pwh )
- 8. Cobra-4 System Configuration ( Top / Pwh )
- 9. Cobra-4 System ( Basic Set )
- 10. Cobra-4 Expansion
- 11. Cobra System Amp Racks
- 12. Flying Accessories
- 13. Cobra System Country Specific Versions
- 14. Technical Specifications
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.
NOTE:
1 x COBRA TOP:
2 x COBRA TOPs stacked vertically
4 x COBRA TOPs stacked vertically
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.
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
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.
The measurements have been done with a line array from omnidirectional point sources with isophase
characteristics.
Figure 07
.
(see fig.07)
Figure 08
(see fig. 08)
Angle of dispersion
horizontal 120° vertical 30°
horizontal 120° vertical 15°
horizontal 120° vertical 7.5°