My Great Small Car Subwoofer
Hark, hark, the dogs do bark
There is that subtle area in music just below 40 cycles that is sorely missing in many cars. I'm not for the big 1000 watt subwoofers but small ones do have a place in the music experience even with the road noise and all.
So I decided to redesign my unit using an old alpine E-10 sub and a sub amp that I had in the corner that put out about 125 watts. Along with this was a sound tube that made a pretty good base reflex unit.
I decided to use 3/4 inch plywood because I wanted the unit solid, if perhaps heavier than it should be. All the edges were glued and screwed.
According to the formula I had the following dimensions: H=14", L=13", W=6, Dv=3", Lv=12", D=10".
This works out to a volume of 14x13x6=1092 cubic inches. I think the fs is 30 Hz for this sub.