JBL Professional
®
Intellivox ADC Installation Manual
11
201402/ADCIM
MODEL H90 ONLY
The location of the acoustic centre of the Model H90 is
in the centre of the unit, both horizontally and vertically.
This is indicated by the yellow sticker on the front grill.
The H90 should be mounted accurately so that
its acoustic centre is at the position identified by the
site survey.
The arrangement of drivers in the H90 differs from the
V90; for this reason, a different set of measurements
needs to be accurately made. For the H90, the critical
aspects of the mounting position are that the horizontal
(long) axis of the enclosure should be precisley
horizontal, and that if the H90 is not being mounted
against a wall (i.e., suspended from a pole or similar
arrangement), the azimuth angle – the angle about the
enclosure’s central vertical axis – should also be exactly
that specified by the DDA survey. Further to these
criticalities, the angle of rotation about the horizontal
axis should also be carefully checked to ensure that the
“downwards” radiating angle of the unit is correct.
fig.4.2 Acoustic centre reference point for H90
Reference point for
acoustical mounting
position - H90
fig.4.3 H90 further mounting information
A
C
H90
B
MOUNTING OPTIONS
Intellivox ADC models have two attachment points at the
rear of the enclosure; the loudspeaker should be mounted
using these points. Each point consists of four M5 threaded
inserts and only the screws supplied with the original
mounting hardware should be used.
Cavity walls can sometimes be problematical when high-
power loudspeakers are mounted on them. The internal
wall cavity may resonate at one or more frequencies,
degrading the audio performance significantly. Installers
are advised to insert rockwool or similar sound-absorbing
material into the cavity in the vicinity of the loudspeaker
when mounting an Intellivox on a wall of this type.
An Intellivox Accessories brochure, which includes a full
range of optional brackets for various situations can be
downloaded from http://www.jblpro.com
fig.5.1 - Standard bracket dimensions in mm
(A) Width = The position of the acoustic centre on the
horizontal plane
(B) The angle of rotation around the horizontal axis
(C) Azimuth = The angle of rotation around the vertical axis
