Situation: I have a 96 Saturn Coupe that I've decided to move the coax from the rear deck to the arm rest area in the back seat. This is for better imaging, and I will leave the 2 holes in the rear deck (covered with OEM plates) to allow the sub to better fill the cabin. When I removed the armrest panels there is a large indentation and at the center of the indentation a triangular piece that can come out. I am assuming it was for outer skin access, but it almost looks like it was designed for speaker placement.
So...to the fiberglass dilema. I am wanting to mount a 6.5" coax flush with the panel. There is a large indentation which will allow the depth of the midwoofer, but nothing to screw into. I was also thinking I could remove the triangular piece to give it more air volume.
1. Should I tape and fiberglass the mold of the space, remove and stretch cloth over and fiberglass that so I will have a surface to mount the speaker? If so, what would be the best method to do so?
2. I could just mount essentially a cone of mdf. I could make rings with the first one attached to the metal and just layer until flush with the panel. With the depth, and at 3/4" mdf, this would take several rings and may not be sturdy unless the rings were 2-3" wide. To get the air volume I would again remove that access panel.
With both options I would add sound deadening mat. I am leaning toward the second option. I could just use my router and cut several rings of 3/4" mdf with the outer diameter around 9" and the inner one to snugly fit the midwoofer. Once flush, and knowing the hole spacing for the speaker I would countersink a t to be able to just screw in the mdf tightly.
Any and all opinion and options are welcome. Thanks in advance.