Cut the holes for the speakers using the jigsaw. Later on, use a file to smooth the edges. You can also use the sandpaper to smooth out the area. Then, cut out round holes measuring two inches. Do this on each of the side panels. These holes will be filled with the connectors for the speaker wires.

Using screws, assemble the box. Seal the joints with silicone. This is to ensure that air will not leak out. Leave the front panel off first. Then, spray glue on the outer portion of the box as well as on the back of the carpet. Wrap the carpet tightly into the box. Put in some carpet at the top panel. With the use of a razor blade or a scalpel, cut vertical, horizontal, and angled lines in a star pattern into the carpet. Then, cut out the carpet that covers the connector holes.

Place in the connectors and make them run through the holes. Make sure that the two prong terminals are inside the box. Then, screw down the connectors. Seal around them with silicone. Solder the speaker wires to the speaker and connector. Also solder the positive wire to the positive lead of the speaker. Do the same with the negative ends. After everything has been done, put in the front panel on the box and screw them in. Push the speakers into the star pattern cut out on the carpet that covers the speaker holes on the front panel. You can now install the box inside your car and enjoy the music.

Carpets that you would be needing for this project could be purchased at Toyota Parts Online along with other auto products. This store specializes in Toyota parts like specifically made Toyota Corona parts.