Bose 131 Marine Owner's Manual page 9

Installing Your Speakers From The Rear Of The Bulkhead
Mark six screw holes. Use the smallest
A 9
hole pattern that fits.
Remove the enclosure from behind the
A 10
bulkhead.
CAUTION: Be sure the enclosure is not in
place behind the bulkhead while drilling.
Drill the marked holes using a
A 11
(.32 cm) bit. Use a center punch to make
a slight indentation for your drill bit. This
will keep the drill bit from "walking" away
from the mark you have made.
You need to open one of the five marked
A 12
drain holes because water can enter your
TM
131 marine speaker through the ports on
the front of the enclosure.
Holding the enclosure in the mounting
position you chose in Step 7, find the drain
hole that will be at the lowest point when
the speaker is mounted and break through
the surface using a center punch, awl, or
inch (.32 cm) drill bit.
CAUTION: Acoustic performance is reduced
if the hole is larger than
diameter.
1 ⁄ inch
8
1 ⁄
8
inch (.32 cm) in
1 ⁄
8
9