I need a sub for my car and love the sound of my Tempest sub. This would make it a good time for an upgrade for the home sub. My question is... since the Tumult future is unknown.. What other type of "high excursion" subs can I put in a 8.5 cf sealed enclosure? I see the recommended alignments for the Stryke AV15 on preorder recommend a 6 cf enclosure for a Q of .55. Would this be a bad idea? Can the box be too big? I like the price which isn't much more than the Tempest ($165)... are there any others that you guys recommend that would work in a 8.5 cf box?