Jbl VT4886-DF89, VT4886-DF88 User Manual

VT4886-DF88
VT4886-DF89

VERTEC SUBCOMPACT DOWNFILL ADAPTERS

USER GUIDE

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Page 2 VT4886-DF88 VT4886-DF89 Downfill Adapter User Guide

IMPORTANT SAFETY INSTRUCTIONS

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with a dry cloth.

7. Do not block any ventilation openings. Install in accordance with manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus that
produce heat.

9. Only use attachments / accessories specified by the manufacturer.

10. Use only with a cart, stand, tripod, bracket, or table specified by the manufacturer or sold with the
apparatus. When a cart is used, use caution when moving the cart / apparatus combination to avoid injury
from tip-over.

11. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been
damaged in any way, such as liquid has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

12. Do not expose this apparatus to rain or moisture.

13. Hearing damage, prolonged exposure to excessive SPL: the loudspeaker is 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.

PRECAUTIONS

The VerTec series speakers covered by this manual are not intended for use in high moisture
environments. Moisture can damage the speaker cone and surround and cause corrosion of electrical
contacts and metal parts. Avoid exposing the speakers to direct moisture. Keep speakers out of extended
or intense direct sunlight. The driver suspension will prematurely dry out and finished surfaces may be
degraded by long-term exposure to intense ultra-violet (UV).

Vertec Subcompact Series speakers can generate considerable energy. When placed on a slippery
surface such as polished wood or linoleum, the speaker may move due to its acoustical energy output.
Precautions should be taken to assure that the speaker does not fall off a stage or surface on which it is
placed.

SUSPENSION OF LOUDSPEAKER SYSTEM

Before attempting to suspend your JBL loudspeakers, read and understand the following safety
information.

IMPORTANT SAFETY WARNING!

The information in this section has been assembled from recognized engineering data and is intended for
informational purposes only. None of the information in this section should be used without first obtaining
competent advice with respect to applicability to a given circumstance. None of the information presented
herein is intended as a representation or warranty on the part of JBL. Anyone making use of this
information assumes all liability arising from such use.

All information presented herein is based upon materials and practices common to North America and
may not directly apply to other countries because of differing material dimensions, specifications, and/or
local regulations. Users in other countries should consult with appropriate engineering and regulatory
authorities for specific guidelines.

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Correct use of all included hardware is required for secure system suspension. Careful calculations
should always be performed to ensure that all components are used within their working load limits before
the array is suspended. Never exceed the maximum recommended load ratings.

Before suspending any speaker system always inspect all components (enclosure, rigging frames, pins,
eyebolts, track fittings, etc.) for cracks, deformations, corrosion, missing, loose or damaged parts that
could reduce strength and safety of the array. Do not suspend the speaker until the proper corrective
action has been taken. Use only load-rated hardware when suspending JBL suspendable loudspeaker
models.

ARE YOU NEW TO RIGGING?

If you are new to rigging, you should do the following:

• Read and study JBL Technical Note Volume 1, Number 14: Basic Principles for Suspending
Loudspeaker Systems (available at http://www.jblpro.com/pub/technote/tn_v1n14.pdf

• Know the rules for safe rigging.

• Attend a safe rigging seminar, such as that presented by professionals like Rigging Seminars™

(www.riggingseminars.com) or by Chain Motor Hoist manufacturers like Columbus McKinnon Corp.
(manufacturers of the C/M Lodestar).

• Meet and establish a relationship with a licensed mechanical or structural engineer. Get in the habit of
asking them questions instead of guessing about their answers. Learn from what they tell you.

• Meet and discuss this aspect of your business with your Insurance Agent.

• Research and understand the codes, practices, and requirements in the venues where you intend to

operate your sound system.

)

GENERAL HARDWARE INFORMATION

Any hardware used in an overhead suspension application must be load rated for the intended use.
Generally, this type of hardware is available from rigging supply houses; industrial supply catalogs and
specialized rigging distributors. Local hardware stores do not usually stock these products. Hardware that
is intended for overhead suspension will comply with ASME B30.20 and will be manufactured under
product traceability controls. Compliant hardware will be referenced with a working load limit (WLL) and a
traceability code.

ATTACHMENT TO STRUCTURES

A licensed Professional Engineer must approve the placement and method of attachment to the structure
prior to the installation of any overhead object. The following performance standards should be provided
to the Professional Engineer for design purposes; Uniform Building Code as applicable, Municipal
Building Code as applicable, and Seismic Code as applicable.

The installation of the hardware and method of attachment must be carried out in the manner specified by
the Professional Engineer. Improper installation may result in damage, injury or death.

INSPECTION & MAINTENANCE

Suspension systems are comprised of mechanical devices and, as such, they require regular inspection
and routine maintenance to ensure proper function ability. Before suspending or pole mounting any
speaker system always inspect all components (enclosure, suspension frames or brackets, pins,
eyebolts, etc.) for cracks, deformations, corrosion, missing, loose or damaged parts that could reduce
strength and safety of the array. Do not suspend or pole mount the speaker until the proper corrective
action has been taken.

Installed systems should be inspected at least annually. The inspection shall include a visual survey of all
corners and load bearing surfaces for signs of cracking, water damage, de-lamination, or any other
condition that may decrease the strength of the loudspeaker enclosure.

Accessory suspension hardware provided with or for JBL VT4886 and VT4883 loudspeakers must be
inspected for fatigue at least annually or as required by local ordinance. The inspection shall include a

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visual survey of the material for signs of corrosion, bending or any other condition that may decrease the
strength of the fastener. Additionally, any eyebolts shall be checked for possible spin-out of the enclosure.

For all other hardware and fittings, refer to the hardware manufacturer's inspection and
maintenance guidelines for process.

JBL is not responsible for the application of its products for any purpose or the misuse of this information
for any purpose. Furthermore, JBL is not responsible for the abuse of its products caused by avoiding
compliance with inspection and maintenance procedures or any other abuse.

Prior to suspending the system, an expert, trained and experienced in suspending speaker systems
should inspect all parts and components.

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.mcmaste r.co m
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 SUSPENSION

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 (WLL)

VT4886-DF88 WLL = 280 lbs (127 kg) 8x VT4886 maximum
VT4886-DF89 WLL = 280 lbs (127 kg) 8x VT4886 maximum

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 pull­back 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

VerTec 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.

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