3f. The plate’s mounting point is
built from a plastic tube, tapped
for a screw mount, nested inside a
rigid metal tube. Cut the metal and
plastic tubing to
3" and epoxy them
together. After the epoxy sets, tap
the plastic tube for #10-24 threads.
3g. Mark the center-bottom of the
cup and drill a ¼" hole. Epoxy the
tapped mount into the hole so that it’s
straight and nearly flush with the outside of the cup. Your driver assembly
4. ADD THE STOP RING
The stop ring around the voice coil holds the weight of the Chladni plate so that the coil doesn’t sink too
far down into the magnet.
4a. Test-fit the driver assembly into
the speaker magnet. Find a reasonable position with most of the wire
coil inside the magnet, and mark
that position on the driver.
4b. Make a plastic ring by cutting
another plastic cup ¼" down from
its rounded lip.
4c. Fit the ring over the driver assembly with the cut edge pointing up
toward the threaded tube, and the lip
facing the magnet side and running
along the marked line. Cut the ring as
needed to fit, and epoxy it into place,
holding it with small squares of tape
as it cures.