Bose Speaker Bose Virtually Invisible 191 Speakers User Manual

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EFERENCE
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Installing in an exterior wall
If you choose to install these speakers in an exterior wall (abutting the outside of your house),
you may encounter insulation behind the wallboard. This can complicate the installation,
requiring you to trim and push malleable insulation out of the way. You will need to wear eye
protection and gloves for working with fiberglass insulation.
WARNING:
If you believe the insulation inside a wall may be composed of asbestos, do not cut
into the wall. Choose a different location for the speakers instead.
Insulation will also impede your use of a pilot hole to test the size of the space behind the
wallboard. Doing such a test is recommended to make sure the space is large enough before
cutting a speaker-sized hole.
Use special care in cutting through plaster and lath
For wall construction of plaster and lath, use special care to prevent plaster from cracking:
• After you have drawn an outline of the hole to cut, tape around the outline and use a sharp
blade to make shallow cuts where the hole will be.
• Then, within the outline only, chip the plaster away until you expose the lath underneath.
Finally, cut through the lath very carefully. Using an electric sabre saw can be quick but risky.
We recommend using a hand saw and proceeding cautiously to avoid damaging the
surrounding plaster.
Special considerations in cold climate regions
With exterior wall installations in regions where outdoor temperatures dip below freezing for
days at a time, using a humidifier can cause condensation to form inside the speakers. This
can be more of a problem if the speakers are mounted upside down.
If you must mount in an exterior wall:
• Avoid installing the speakers upside down.
• Leave some of the insulation between the speakers and the exterior wall.
• Refrain from setting the humidifier on high, especially when outside temperatures are below
freezing.

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