I've been asked to build an enclosure for a friend, but this one has me second guessing myself because I'm not that knowledgable on ported enclosures... He wants to down fire the sub for protection from elements and being hit by something. (Going in a Jeep trail rig) If I use the enclosure design pictured, but move the sub to the bottom and raise the enclosure off the floor will the port still firing out the front of the enclosure create some weird sound issues? Would it be better to just use a down fire sealed enclosure for this application?
For reference he is using a Sundown Audio SA12 and this is the enclosure they recommend.