Making your own waterproof speaker enclosure is a way to save cash. You can build custom waterproof cases with materials available at any home improvement store. The sound quality won't suffer do to the thin latex membrane that is used to protect the speaker cone. Once you've finished your speaker box, you won't have to belt out tunes in the shower a cappella anymore.
Remove the two computer speakers and circuit board from the casing. Discard the casing.
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Position the speakers on the outside of the waterproof container and trace them with a permanent marker. Set the speakers off to the side.
Cut the traced holes out of the container with a rotary tool equipped with a small cutting blade. Cut the container slowly to prevent chipping or cracking the plastic.
Cut out the palm and back of a disposable latex glove. Retain the fingers for later use.
Epoxy the latex pieces to the interior of the container so that they cover both speaker holes. Wait for the epoxy to cure. This can take from 10 minutes to two hours depending on the epoxy. Check the label for curing time.
Seal the outside of the speaker holes with silicone. you can apply the silicone by painting it on or using it directly from the tube and spreading it out by hand. If you opt to spread it by hand, wear latex gloves.
Epoxy around the outside of the speakers and place them in the interior of the container. Align them so they completely cover the speaker holes.
Slip the circuit board into the container and mark the spots for the volume, tuning and power knobs with a permanent marker. Remove the circuit board from the container.
Drill out the holes for the knobs with a glass boring drill bit slightly larger than the diameter of the knobs.
Cut two fingertips off the disposable glove that you saved earlier. Epoxy them to the interior of the container around the holes for the tuner and volume control. Wait for the epoxy to cure.
Silicone the outside of the fingertips in the same manner as the speaker holes to seal them completely.
Insert the circuit board and slip the knobs into place. Epoxy the circuit board to inside of the container.
Seal the container and spray paint the entire speaker box.
Hot glue a piece of mesh to a small plastic picture frame to create a cover for the speakers. Glue the picture frame down over them.
Open the container and slip out the power cord from the circuit board. Strip the last inch off the wire with wire strippers.
Connect the 9-volt battery clip to the wires by twisting them together. Cover the exposed wire with electrical tape. Insert a 9-volt battery and slip the unit back in the container.
Place a desiccant packet in the container to absorb any residual moisture. When you're ready to listen to music, open the container and attach your MP3 player.