JBL Professional
®
Intellivox ADC Installation Manual
14
202011/ADCIM
MECHANICAL INSTALLATION
Acoustic Centre
Mounting an Intellivox ADC loudspeaker is a straight-
forward procedure, but it is essential to understand
that the precise mounting location is extremely critical.
The correct mounting location is defined as part of the
acoustical design process and the installer should make
sure that he/she has this information before commencing
to mount the Intellivox ADC.
MODEL V90 ONLY
The correct operational height defined by the system
designer is the height of the Intellivox ADC’s acoustic
centre (reference point). This point does not necessarily
coincide with the position of any particular physical
component on the unit. The location of the speaker’s
acoustic centre is marked by the centre of the yellow
sticker on the front face of the unit at the time of
shipping, and it is this position that must correspond
to the operational height defined in the design process.
The vertical position of the acoustic centre of the Model
V90 is towards the top of the unit, as indicated by the
yellow sticker (see fig.3). The horizontal position is on
the vertical centre line.
When calculating the positions for the mountings (see
below), the distance from the acoustic centre to the
top or bottom of the loudspeaker (whichever is being
used as the reference datum) should be measured and
then allowed for when marking the mounting positions.
The specification sheet supplied with each loudspeaker
includes a mechanical drawing clearly showing the
mounting position locations.
The V90 will normally be mounted perpendicular to
the listening plane, i.e. vertically when the floor is a
conventional horizontal plane. However, if the DDA
investigation has specified a downward angle for some
reason, this angle must be adhered to in the mounting
process. This is likely to necessitate the use of spacers
on the upper mounting bracket.
Because of the tightly-controlled vertical radiation
pattern of the V90, a small deviation from the calculated
acoustical mounting height or vertical mounting
angle may cause severe degradation of the expected
performance.
Note also that the yellow sticker indicates which way is
“up”; ensure that this orientation is observed.
fig.3 Sticker showing acoustic centre and unit
orientation
Reference point for
acoustical mounting
height - V90
fig.4.1 Acoustic centre reference point for V90
