i am going with the alpine specs, and sealed. due to simplicity it is much easier to make my creation sealed and then add to the inside to achieve the airspace i want. according to alpine the airspace for a sealed 10 is 0.5 to 0.8cf after displacement. for a ported it is 0.6 to 1.25 cf. again, i am not going to be competing or anything serious, this is just to have good sound in my work car. the amp driving them will be rated at 600 x 2 @ 4ohm. numbers don't mean much to me and i will be tuning it with my dmm when the times comes.
interesting what you said though. according to alpine specs, for a 12 it should be 1.7cf ported per, for a total of 3.4cf in a ported enclosure. tuning is almost right on as they call for 33hz. possibly the specs have changed with the newer models compared to what you had.
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