Master audio JOKER Serie Manual Usuario página 19

Master Audio
To obtain a clear and free-distortion reproduction, it is advisable to place the mid-high
units on top of the low units keeping between them an approximate height of two
meters. If such height cannot be achieved nor maintained, it is advisable to use the
classical tripod for each mid-high cabinet and leave the low units on the floor.
WARNING!!! For installations that suffer from acoustic problems and in which it is
necessary to reinforce the response in the low frequencies, it is advisable to group all
the subwoofers together in the same point. By this way, cancellations will be avoided
and a higher acoustic pressure level will be obtained.
3.5. Asymmetrical and rotatable horns
The JK10A, JK12A, JK15A and JK318A models incorporate an asymmetrical
dispersion horn which will optimise coverage either in horizontal or vertical position.
Fig.7. Rotatable horn
Good coverage of audiences often is a conflicting combination of:
*wide coverage for the closest audience (short throw)
*narrow coverage for distant areas (long throw)
The asymmetrical dispersion horn coverage varies from "short throw" to "long throw"
along the vertical axis (keeping a constant vertical directivity). In conclusion,
directivity feature of (50º to 100º(H), 55º(V)) can be seen as if the horn itself had "two"
horizontal directivities (audience coverage), which depend on the distance. For short
distances the horn should be used with its "wide" dispersion (100º). For long
distances the horn should be used with its "narrow" dispersion (50º). We suggest you
to pay attention to the following examples.
3.5.1. Vertical-Positioned Cabinets (Flown and aiming to the audience)
We need wide
coverage
(100º) for the
closest
listeners and
narrow
coverage for
the distant
audience.
Fig.8. Vertical position
Joker Series (Active). Version 1.4
To rotate the horn, unscrewed the
frontal grille, and then, unscrewed
the four fixing screws of the horn.
Rotate it 90 degrees taking care of
the wires. Screw the horn again
and finally place the frontal grille in
its right position.
Jan14
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