Dynacord COBRA Посібник користувача Посібник користувача - Сторінка 5
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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
3. SETTING UP
When providing sound reinforcement for medium-sized marquees, multi-function halls and open air events,
the question often arises as to whether the enclosures have to be flown or whether simple stacking of the
enclosures near the stage will suffice.
As a rule of thumb, the angle of incidence with regard to the most distant listener should be at least
5°, if excessive attenuation of the sound waves by the audience is to be avoided.
To project over a distance of up to 40 metres, the mid/high enclosures should therefore be at least 3 to 4
metres above the floor level of the audience area
(see fig. 05).
It is still normally possible to achieve this by simply stacking the enclosures on the stage. The mid/high
enclosures should be tilted towards the furthest third of the audience area.
The 5° criterion is satisfied by such an arrangement up to a distance of around 20 to 30 metres. Beyond that,
the sound is too severely attenuated by the audience.
Figure 05
For distances of up to 80 metres, the mid/high enclosures must be between 4 and 6 metres off the
ground if an angle of incidence of around 5° with regard to the most distant listeners is to be
achieved
(see fig. 06).
Figure 06
With an unsecured ground stack that is scarcely achievable. The mid/high enclosures must therefore be
flown from a truss.
As a result of the shallow vertical directivity of the line arrays, when the systems are flown at a height of 4 to
6 metres, the medium and high frequency ranges only become audible at a distance of 10 metres from the
stage
.
To provide sound reinforcement to the areas directly in front of the stage, a 'front fill' enclosure with an
extremely wide horizontal directivity of around 120° is therefore needed (e.g. 1 x COBRA TOP).