Im planning to put a 10" or 8" sub upfront, on the passenger footwell. I'll be using fiberglass for the enclosure.
1) Does fiberglass differ too much from MDF in terms of sound quality?
2) If I put in polyfill (or fiberfill, whateverl that pillow-fill material is really called), should the internal volume be the interior of the enclosure without the fill, or with the fill? (ie, if the requirement is 0.66 cu ft, should it be a little over 0.66 to make an allowance for the fill?)
3) Has anyone ever trie this before? Would the sub produce a solid "thump" in that location?
Im planning to use liters on the actual project so I'll just use water to estimate the volume of the prototypes. Its too much hassle to compute for the volume in an irregular shape enclosure.