Using the measurements from a few rear seats we determined that the seat base can be 17’’ away from the back of the car. We need 8’’ on the top of the enclosure to house a pair of 6’’ x9’’ speakers. The back seat angle fits perfectly with these plans. We drew a straight line on the floor at 17’’.

Poster board was used to create a template for the cabinet base. We followed the contour of the body and marked where the two holes will be for the body mount bolts.

The pattern was transferred to a sheet of 5/8’’ MDF board and cut out.

Our design incorporated 2 amplifiers mounted on the same plane as the back of the seat. One amp for the single 10’’ sub and the other for the 6’’ x 9’s and a pair of 5.25’’ component speakers that will be added up front. The box created for the amps was moved high enough to leave some room underneath to get to those mounting bolts and on this side and a bit of storage space. A bit of filler was used to seal the mounting point as this side panel will also be used as the side of our sub speaker cabinet, so it will have to be air tight.

A mirror copy was made for the other side. Under this side we will locate a dry cell battery. This leaves us a 12’’ wide area that is 22’’ high. We filled the back of this speaker area and added a top, we now have all sides of the sub cabinet ready. We pulled the template out of the Sub box and transferred it the front panel. The wub woofer we chose is very heavy so we predrilled the mounting holes so we won’t have to struggle with it later on.

We traced out a top ledge that will hold the 6’’ x 9’’ speakers. It fits nicely along the edge of the body and will clear the rear window molding still to be installed. We did a test fit to be certain. Sure would be an oversight if we had to rebuild this box because it was ½’’ too high.

To hide all of the wiring and to have a panel that we can upholster or paint, we sketched out this cover panel and cut it out of another sheet of MDF. To clean it up a bit we ran a router around the edge of the square cut holes putting a radius on all edges.

We are by no means done, but at this stage there are no surprises we hope. Our next step will be to decide on the deck / radio location. Will it be a floor console or an overhead design? We should probably lift the transmission in place to see how our Lokar shifter plays into the design. See you again soon.