Flexbox Back Box Installation
Introduction
Russound's speaker back box oers an innovative acoustic barrier that
will reduce background noise, furnish a moisture barrier, diuse
distortion, and improve sound quality. It is easily installed in both new
construction and retrot settings. The design incorporates a exible
construction with noise-absorbing materials. Both models are ame
retardant and meet the following standards: ASTM E119 and UL 263/
NFPA 251 (1-hour) and ASTM E84/NFPA 70. The Flexbox back box is sized
to t between the studs with depths of 3.5" (89 mm) for the in-wall
enclosures and 6" (152 mm) for the in-ceiling models. As a retrot solution
for in-ceiling speakers, it can be rolled up, inserted through the hole in
the drywall, and secured to the studs or drywall prior to installing or re-
installing the speaker.
**Important: For re rated installation, seal the hole where the speaker
wire comes into the back box with re rated caulk. (3M’s Fire Barrier Sealant
FD150+ or FD200+ is recommended). Coating around the edge of the
drywall side of the box is not required but could be added to create a strong
acoustic seal.
Retrot Installation (In-ceiling only)
Poke a small hole or slit in one of the back box sidewalls for the1.
speaker wire.
Consult with building plans to locate existing pipes, duct work, and2.
AC wiring and to make sure location of speaker has proper depth and
space between studs.
Cut the hole in the wallboard or drywall as specied by the speaker3.
manufacturer.
Pull the necessary wire to the nal speaker location and through the4.
hole made in the sidewall of the back box.
Flatten and roll up the box and push through the hole.5.
Center the box on the center of the cutout and trim excess material.6.
(Optional) Apply caulking around the inside of the drywall opening7.
and adhere the face of the box to the drywall. (**Apply re-rated
caulking if applicable - See Important note at right.)
Connect the speaker wire to the speaker and install the speaker8.
according to the manufacturer’s specications.
Flatten and Roll Back Box
Insert in Opening
Secure to studs and drywall
Trim excess material around opening
Installation - New Construction (In-wall or In-ceiling)
Poke a small hole or slit in one of the back box sidewalls for the1.
speaker wire.
Choose the stud opening that best suits the speaker application.2.
The speaker location should be free of obstacles (electrical wiring,
plumbing, duct work). Refer to the speaker manual for the minimum
clearance depth for the speaker.
Place the back box between two studs with the front face ush with3.
the front edge of the studs. Screw, nail or staple the box to the stud
from the inside of the back box.
Pull the speaker wire through the hole in the back box sidewall.4.
Attach speaker brackets (if applicable) to the studs, centering the5.
bracket on the back box cutout. Refer to the bracket installation
instructions. Trim any excess material from the opening of the back
box using a sharp knife and the bracket as a guide.
Provide the drywall installer with the precise location and dimensions6.
of the speaker brackets. The speaker cutout (hole) must not extend
further than ¼" (0.6 cm) from inside of the mounting bracket.
After drywall is hung, trim any excess material if necessary.7.
(Optional) Prior to speaker installation, apply caulking around the8.
inside of the drywall opening and adhere the face of the box to the
drywall. (**Apply re-rated caulking if applicable - See Important note
below.)
Connect the speaker wire to the speaker and install the speaker9.
according to the manufacturer’s specications.
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