My toolkit had
a supply of 5 mm bolts, nylock nuts, shakeproof washers, felt washers
and large steel washers, so these were used - and all holes were
drilled to a diameter of 5 mm.
The JVC speakers
weigh around 500 grams each and rather than just bolt the speaker
to the locker floor, I decided to use a 25 mm steel washer to spread
the load from the 5 mm bolt head.
You will notice
that the speakers are mounted slightly away from the corners. In
the Triton there is a dead space in the corner between the side
and end overhead lockers, and this was thought to be an ideal place
for the speaker mounting bolt. Removing the access panels revealed
that the right hand dead space contains the electrical junction
boxes for the 12 V supply, so we couldn't use this space.
The locker floor
was drilled in-line with the edge of the locker door and 80 mm back
from the front edge - a trial fit of the speaker showed this to
be a good position.
The top of the
plastic speaker box was drilled at the balance point - determine
this by balancing the speaker on a round pencil - which is about
35 to 40 mm from the front grill. Inside the top of the speaker
there is a channel for a 19 mm by 100 mm wood battern to provide
additonal support, this was glued in place and drilled at the same
A 35 mm by 5
mm bolt and 25 mm washer was pushed down through the locker floor,
then the felt washer was placed on top of the speaker, and from
inside the speaker, a shakeproof washer and nylock nut was tightened
up. The felt washer allows the speaker to be rotated to the best
position for listening.
The JVC HiFi
cost £69.95 and a morning of time.