Drilling The Pilot Hole - Bose VIRTUALLY INVISIBLE 191 Installationsanleitung

S I
TEPS TO NSTALLING
Figure 8
Caution against drilling
without eye protection
Figure 9
Using a spade bit with a
power drill to create the
pilot hole
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Drilling the pilot hole

You will need a half-inch spade bit and power drill, or a special rotary cutting tool for this
step.
WARNING: Use eye protection and be sure to observe all safety precautions while using a drill
or cutting tool (Figure 8).
WARNING: Make sure the spot chosen is safe for cutting. Do not cut through surfaces that may
have hazards such as electrical wiring, conduits, or plumbing concealed behind them. Follow all
other safety precautions.
1. Center the tip of the drill bit in the top circle you have drawn.
2. Drill completely through the wallboard to create a hole that you can probe behind.
Note: If you encounter insulation in the wall, it will be difficult, or impossible, to probe behind the
pilot hole. If you are certain that your chosen location is free of hazards and impediments, you
may choose to cut the hole for the speaker anyway, remove some of the malleable insulation, and
proceed from there. Refer to "Prepare the wall for inserting the speaker" on page 13.
3. Drill the second hole just below the first one (Figure 9). This elongates the hole to allow
for testing the space for the length of the speaker enclosure.
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