JBL INSTALLATION P81BB Manuel utilisateur

JBL PERFORMANCE

™

SERIES

INSTALLATION INSTRUCTIONS

P81BB

P941BB

BACK BOXES FOR P81

AND P941 LOUDSPEAKERS

P81BB, P941BB OM 11/16/05 3:04 PM Page 1

This document contains general

installation instructions for the JBL®

Performance™Series P81BB and

P941BB Back Boxes. It is important to

read this document before attempting

to use this product. Pay particular

attention to safety instructions.

WARNING

Calls attention to a procedure, practice,

condition or the like that, if not correctly

performed or adhered to, could result

in injury or death.

CAUTION

Calls attention to a procedure, practice,

condition or the like that, if not correctly

performed or adhered to, could result

in damage to, or destruction of, part or

all of the product.

NOTE

Calls attention to information that is

essential to highlight.

2 Documentation Conventions

3 Important Safety Instructions

4 About the Back Box

4 Installation Instructions

7P81BB/P941BB Back Box Outer Dimensions

7 Obtaining Service

P81BB/P941BB

BACK BOXES FOR P81 AND P941

LOUDSPEAKERS

DOCUMENTATION

CONVENTIONS

P81BB, P941BB OM 11/16/05 3:04 PM Page 2

IMPORTANT SAFETY

INSTRUCTIONS

Read before starting installation:

•Product contains fiberglass wool.

•Disturbing the insulation in this

product during installation, main-

tenance, or repair will expose you

tofiberglass wool. Breathing this

may cause lung cancer. Fiber-

glass wool is known to the state

of California to cause cancer.

•Fiberglass wool may also cause

respiratory, skin and eye irritation.

•To reduce exposure to this sub-

stance or for further information,

consult material safety data

sheets available from the address

shown below, or contact your

supervisor.

JBL Consumer Products

250 Crossways Park Drive

Woodbury, New York 11797 USA

WARNING

This enclosure is not listed for use

in air-handling plenums. Installation

of this enclosure in walls or ceil-

ings of fire-barrier-rated construc-

tion requires that construction

methods shall be employed in order

tocomply with local building or life

safety codes. Consult your local

authority having jurisdiction (build-

ing, electrical or fire safety inspec-

tor) to determine what acceptable

construction methods will be

required.

WARNING

The P81BB In-Wall Back Box

weighs 19 lb (8.6kg) empty, and

32 lb (14.52kg) with a P81 speaker

system installed in it. The P941BB

In-Wall Back Box weighs 19 lb

(8.6kg) empty, and 36 lb (16.3kg)

with a P941 speaker system

installed in it.

ANSI/EIA 636 Recommended

Loudspeaker Safety Practices,

Section 16.3, recommends that the

mounting system used to install the

In-Wall Back Box in walls or ceil-

ings should support the weight of

the product plus at least four times

the weight of the product being

installed. That means, for a P941

installed in an In-Wall Back Box,

the mounting system should be

able to support at least 163 lb

(74kg).

It is strongly recommended that the

installer consult a construction pro-

fessional or a professional engi-

neer to determine the appropriate

mounting methods to be used for

each specific installation location.

P81BB, P941BB OM 11/16/05 3:04 PM Page 3

ABOUT THE

BACK BOX

Thank you for purchasing the JBL

Performance P81BB/P941BB Back

Boxes, which are optional rear enclo-

sures for the JBL P81 and P941 In-Wall

Loudspeakers. The P81BB/P941BB

Back Boxes which provide optimal vol-

ume for woofer alignment and reduce

acoustic bleed-through to rooms

adjacent to your listening area. The

P81BB/P941BB Back Boxes also func-

tion as mounting brackets designed

tofacilitate the installation of the

P81/P941 in-wall loudspeakers in new

construction or major retro-fit installa-

tions. The back boxes improve sonic

performance while providing solid sup-

port for the speaker mounting frame

and baffle assembly. Since the back

box is installed before the drywall is

mounted, it allows the speakers to be

mounted in a clean, efficient manner.

The JBL P81BB/P941BB Back Box

measures 17-1/2 inches x 28-5/8 inches

(445mm x 727mm) (including the

flanges). The back box is designed

to mount between two 2x4-inch (or

2x6-inch) wall studs on 16-inch centers.

See Figures 1 and 2 for inner dimen-

sions of the P81BB and P941BB.

The following items are required for

installation:

•tape measure

•carpenter’s level

•pencil

•hammer

•nails

•drywall section

•drywall screws

•staples/U nails

•utility knife

•service wire (included)

•work gloves

•face mask

CAUTION

The back box should be installed by a

professional. Installers must adhere to

local building codes to ensure proper

installation. JBL is not responsible for

any injury or damage caused by

improper installation.

Figure 2: P941BB Back Box Height and Width

19.22 inches

(488.2mm)

12.50 inches

(317.5mm)

28.62 inches

(727mm)

17.50 inches

(444.5mm)

13.57 inches

(344.7mm)

21.16 inches

(537.5mm)

INSTALLATION

INSTRUCTIONS

14.84 inches

(376.9mm)

10.65 inches

(270.5mm)

17.50 inches

(444.5mm)

13.57 inches

(344.7mm)

16.78 inches

(426.2mm)

28.62 inches

(727mm)

Place side flange

on top of stud This flange fits in between wall studs

In-wall fits here

Figure 1: P81BB Back Box Height and Width

P81BB, P941BB OM 11/16/05 3:04 PM Page 4

Figure 3: P81BB/P941BB

Back Box Depth

NOTE

Figure 3 shows the depth of the back

box. It can be installed in walls con-

structed with standard 2x4s. It is impor-

tant to note that the speaker mounting

frame requires a minimum depth (from

the wall face to the inside back of the

P81BB/P941BB Back Box) of 3-1/2 inches

(88.9mm) for proper installation. This

can only be achieved by using 5/8-inch

(15.9mm) drywall on the wall face. It is

recommended that the installer consult

with the drywall installer before begin-

ning the installation.

CAUTION

Installers are advised to wear work

gloves and face masks when installing

the back box and making wire con-

nections, as the back box contains

fiberglass.

Figure 4: Place the Back Box

Between Wall Studs

1. Use a tape measure to determine the

location where the speaker is to be

mounted. Refer to the JBL P81/P941

In-Wall Loudspeaker owner’s manual

for speaker placement considera-

tions. Record exact measurements

from the floor, ceiling and an adja-

cent drywall section.

NOTE

The P81BB/P941BB Back Box elimi-

nates sensitivity to placement consid-

erations due to standing waves within

the wall cavity, as described in the JBL

P81/P941 In-Wall Loudspeaker owner’s

manual.

2. Position the back box between two

wall studs and into the wall cavity, as

shown in Figure 4. The back box must

be placed between standard 16-inch

on-center stud spacing. If desired,

the back box can be mounted upside

down (large flange toward the floor)

if you will be mounting the speaker

close to the ceiling.

Figure 5: Fasten Back Box to

Wall Studs

3. Firmly secure the back box into place

using nails, as shown in Figure 5.

TOP

3.375 inches

(85.7mm)

Rear Front

TOINSTALL THE

BACK BOX

P81BB, P941BB OM 11/16/05 3:04 PM Page 5

CAUTION

Installers must adhere to local building

codes to ensure proper installation.

JBL is not responsible for any possible

damage caused by improper installation.

4.Feed the power amplifier wires from

the wall cavity down through the

cable clamp located on top of the

enclosure. Pull approximately two

feet of wire through the clamp to

create a generous service loop

inside the enclosure for ease of

hookup, as shown in Figure 6.

Figure 6: Amplifier Connections

Tighten the clamp screws, cinching

the wires in place

CAUTION

Be sure to comply with local wiring

codes. JBL is not responsible for any

damage or injuries that may result from

faulty wiring.

6. Place the section of drywall over

the back box. With tape measure

and pencil, carefully measure and

mark where to position the wall

template (included with the loud-

speaker) by using the measure-

ments recorded in Step 1.

7. Use the wall template to trace

where to cut the drywall.

8. Cut a small hole in the center of the

template area to make sure the

template is in the right location.

9. After confirming the correct loca-

tion, cut the template hole opening,

asshown in Figure 7. Use a carpen-

ter’s level to ensure the opening is

level.

Figure 7: Cut Opening in Drywall

10. Fasten the drywall to the wall studs

using drywall screws.

11. Install the speaker mounting frame

into the wall opening. Refer to the

JBL P81/P941 In-Wall Loudspeaker

owner’s manual for complete

instructions.

12. Route wires to the top of the

speaker frame to prepare for

hookup.

Figure 8: Route Wires to Top of the

Loudspeaker

In-Wall Speaker Frame

Route Wires to the Top

of the Speaker System

Avoid Contact Between

the Wires and Speaker Cone

Back Box

Cable Clamp

–

Binding Posts

Power Amplifier

P81BB, P941BB OM 11/16/05 3:04 PM Page 6

Exposed Binding Post

Make Connections

Observing Proper Polarity

In-Wall Speaker Rear

Binding Posts

ABC

Insert Stripped Wires

Into Exposed Holes

Terminal Connectors

13. Locate the loudspeaker’s binding

posts, as shown in illustration A

of Figure 9. From the top of the

speaker, run the wires down to

the loudspeaker’s binding posts,

as shown in illustrations B and C.

14. Loosen the terminal connectors by

hand (counterclockwise) on the

binding posts until the holes in their

threaded posts are visible. Insert

the wires from the top, as shown in

illustration B in Figure 9.

NOTE

Make all connections observing the

proper polarity, positive to positive (+)

and negative to negative (–).

15. Retighten the terminal connectors

by hand to ensure a secure con-

nection.

16. Refer to the JBL P81/P941 In-Wall

Loudspeaker owner’smanual for

complete instructions on installing

the speaker baffle to complete the

installation.

P81BB/P941BB

BACK BOX OUTER

DIMENSIONS

Width 17-1/2 inches (445mm)

Height 28-5/8 inches (727mm)

Depth 3-3/8 inches (86mm)

OBTAINING SERVICE

Before returning a product for warranty

or nonwarranty service, contact JBL

Customer Support to determine the

extent of the problem and to obtain a

Return Authorization (RA) number. No

products will be accepted without an

RA number issued from JBL.

If a JBL product must be returned for

repair, JBL will assume no responsibility

for the product during shipping from

the customer to JBL, whether the prod-

uct is or is not covered under warranty.

All Returns Must Be:

•well-packaged using the original

packing materials (if possible)

•properly insured and consigned

•prepaid to a reliable shipping agent

The following information must be

included when a product is returned for

service:

•Name

•Company name

•Street address, city, state and zip

code

•Telephone number, including area

code and country code (if applicable)

•Product serial number

•Adetailed description of the problem

•The preferred method of return

shipment

•RA number clearly marked on both

the inside and outside of the package

To Contact JBL Customer Support:

Call 516.255.4JBL or visit www.jbl.com.

Figure 9: Speaker Connections

P81BB, P941BB OM 11/16/05 3:04 PM Page 7

JBL Consumer Products

250 Crossways Park Drive

Woodbury, New York 11797 USA

www.jbl.com

Part No. 360863-001 11/05

All features and specifications are subject to change without notice.

JBL and Harman International are trademarks of Harman International

Industries, Incorporated, registered in the United States and/or other

countries. Performance is a trademark of Harman International Industries,

Incorporated.

P81BB, P941BB OM 11/16/05 3:04 PM Page 8

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