Mechanical Installation; Acoustic Centre - JBL Intellivox-DC115 Installation Manual

MECHANICAL INSTALLATION

Acoustic Centre

Mounting an Intellivox loudspeaker is a straightforward
procedure, but it is essential to understand that the height
of the unit above floor level is extremely critical. The
"correct operational height" 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.
The correct operational height defined by the system
designer is the height of the Intellivox's acoustic centre. 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 relative to the
bottom of the unit varies from one Intellivox model to
another, though it will always be on the vertical centre line.
16
fig.12 Sticker showing acoustic centre and unit orientation
When calculating the positions for the mountings (see page
18), 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 model-specific
specification sheet supplied with each loudspeaker includes
a mechanical drawing clearly showing the mounting
position locations.
Because of the extreme tight vertical radiation pattern of
the Intellivox, a small deviation from the calculated
acoustical mounting height 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.
Ensure the protective blue foam behind the
grille is removed before operation.
JBL Intellivox Installation Manual
201401/IvxIM_v2.2