After finishing my Tempest sub (Adire Alignment - Vented) some time ago I finally got around to giving it a little bit of a good workout. I was unimpressed by the output, and decided hook up my car subwoofer (Kenwood 10" DB+ in a sealed 1 cu. ft. box) to a spare amp for comparison. I unhooked the main speakers and ran the LFE output only, and ran some listening tests. The 10" sub is definately wanting in the volume department, but it sounds so much better. On Chapter 32 of the Matrix (about 15 seconds in), you can distinctly hear helicopter blades whooshing on the Kenwood, while on the Tempest they were not even audible (just a loud rumble). When I plugged the ports on the Tempest, the blade "whooshing" became audible but was very messy and not at all clear and punchy like on the Kenwood. I've sealed everything on both boxes and there are no air leaks I can see on the Tempest sub. My question is this: Am I asking too much from a 15" woofer? Would it sound better if I moved the Tempest to the mid-Q sealed design? Or did I just goof up the Tempest box and I have either bad bracing or air holes still (either is possible, the box is fairly resonant)? I'm more concerned right now with detail than with loud.