7
PRECAUTIONS
Resources
Adaptive Technologies Group
McMaster Carr
562.424.1100
Various Locations in the USA
1635 E. Burnett Street
For a location near you, visit
Signal Hill, CA 90755
them at www.mcmaster.com
www.adapttechgroup.com
JBL Professional - Tech Note Vol. 1 No. 14
“Basic Principles for Suspending Loudspeakers”
www.jblpro.com/catalog/support/getfile.aspx?docid=296&doctype=3
Safe Rigging
JBL suspendable version loudspeakers are supplied with built-in internal brackets. The systems are designed
to facilitate the suspension of the loudspeaker by a qualified person familiar with rigging hardware and industry
practices. Improper installation may result in damage, injury or death.
If you are unfamiliar with Safe Rigging Practices you will need to consult with a qualified person familiar
with rigging hardware and industry practices.
Working Load Limit
Working Load Limit for M10 Suspension Points
The working load limit (WLL) of any JBL suspendable loudspeaker system using the M10 attachment point
will be maintained as long as no more than 470lbs/213kg from 2 points equally loaded or no more than
235lbs. / 106 kg from a single point maximum and as long as safe rigging practices are followed.
For permanent installation applications utilizing the M10 suspension points order JBL 229-00009-01.
This kit includes three (3) M10 x 35 mm forged shoulder steel eyebolts with washers.
WARNING
Suspension of JBL loudspeakers must employ a minimum of two (2) attachment points. When "bridling" a JBL
loudspeaker system, two (2) legs of equal length must be used. The rear attachment points are pull-back points
and are intended only for use in adjusting the down-angle of the speaker enclosure. Only the top and bottom
attachment points are intended for use as suspension points.
Hearing Damage, Prolonged Exposure To Excessive SPL
PRX500 series loudspeakers are easily capable of generating sound pressure levels (SPL) sufficient to cause
permanent hearing damage to performers, production crew and audience members. Caution should be taken to
avoid prolonged exposure to SPL in excess of 90 dB.
