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BOUT THE
BACK BOX
Thank you for purchasing the JBL
P
erformance P81BB/P941BB Back
B
oxes, which are optional rear enclo-
sures for the JBL P81 and P941 In-Wall
Loudspeakers. The P81BB/P941BB
Back Boxes which provide optimal vol-
u
me 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
t
o facilitate 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
i
nstallation:
• 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)
I
NSTALLATION
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