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Reworked the sub box to allow airflow through the sides on the front.
The older Boston Acoustics spg555 is quite a sub. Rated to 1000 rms and can do high 130s db in a ported box. Neodymium magnets and a surface area similar to a 13 inch sub. Cone has roughly 3.3/4 inches of travel. Kind of overkill for the system going into the M3 but it will have plenty in reserve.
Running this in a 1 cubic foot sealed box with a passive radiator which more SQ orientated. Also is a bit like running a ported box without taking up 2 1/2 cubic feet.
Added about 6mm to the bottom of the enclosure. This is so it will sit up against the trunk crossmember at the top. Will also add some brackets on the side and attach to the BMW rear tie down points. Don't want it submarining through the back seat in an accident.
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