ATEIS Messenger Series - Manual (Page 25)

Messenger Operating Manual
Page 25 of 38
For the groundsection coverage an A-symmetrical lobe is more common to use. For a remote
balcony a symmetrical lobe is more common.
Typical A-symmetrical lobe shape with the acoustic centre on driver number 4:
Typical Symmetrical lobe shape with the acoustical centre on driver number 13:
Beside the adaptable acoustic centre, every chosen lobe has a variable opening angle, which
is selectable from max. 45 degrees to a minimum of 5 degrees. With this function together
with the selected height of the speaker, an even signal pattern can be accomplished. It is also
known that a 5 degrees penetrates the environment much better than one with a bigger
opening angle. It is therefor useful to build a lobe out of two lobes when you have to deal with
a long throw to reach the last seats. (@ 40 – 50 mt). The far-field lobe could be a 10 or 5
degrees one and is focussed on the last seat. A near-field one could be a 15 or 20 degrees
one with an azimuth/tilting of app. 12 degrees.
Typical 45 degrees shape:
Typical 5 degrees shape: