ATEIS Messenger Series - Manual (Page 8)

Messenger Operating Manual
Page 8 of 38
6.1. Mounting considerations:
Mounting instructions:
A: Acoustical centre When the acoustical centre is chosen in the lower range of the array,
an Asymmetrical lobe is generated. These are used in conjunction
with mounting heights between 1.8 and 4m from the floor and results
in a lobe that starts at 5m distance from the array at earlevel and ends
in a sharp lobe at 60m and further. The Asymmetrical lobe has the
ability to keep the sound deviation within 2 dB from 5 to 60m. Its
mounting height is NOT critical and therefore it is the most used
system solution. The vertical-opening angle is adjustable from 40
down to 5 degrees, with steering up to 30 degrees up and down.
The acoustical centre runs from A-symmetrical to Symmetrical, from
bottom to top in 9-steps.
H: Mounting height This height is measured between the floor and the bottom of the array
which starts at the bottom driver. (Small plate).
It is recommended to keep this height around 2mt.
D: Min. Distance This distance is measured from the front wall towards the first
listener’s position.
E: Effective range This distance is measured between the Messengers mounting
position and the last listener’s position.
Additional information:
Position: It is of vital importance that the Messenger is always placed in a rectangle
line with the listener’s plane. This ensures that reflected energy from the
back-wall stays in the acoustical centre and is not bounced into the ceiling
area where it might contribute artificial reverberation to the building
acoustics.
Opening angle: The vertical opening angle can be varied between 40 and 5 degrees.
Steering: Steering up to +/- 30 degrees.