JBL Ivx HP-DS170 Installation Manual - page 17
17
201601/IvxHPDS_v1.2
JBL
®
Intellivox HP series Installation Manual Rev 1.2
MECHANICAL INSTALLATION
OF THE LOUDSPEAKER
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 coincides with the centre of the loudspeaker’s
lowest drive 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. Note that the horizontal
position of the acoustic centre is on the vertical centre line
of the column.
When calculating the positions for the mountings (see
following page), 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 mounting height may
cause severe degradation of the expected performance.
Similarly, the Intellivox should be perfectly vertical in both
planes unless otherwise specified (see Fig.16 below).
Fig.15 Sticker showing acoustic centre and unit orientation
Fig.16 Illustration showing the critical vertical alignment in
both planes