Since I may be moving into a dorm room or apartment evantually I would be interested in building a smaller enclosure for my Tempest. I like the idea of a ported design. But unfortuneately, Tempest + ported usually means a large volume enclosure. That is why I am considering a sonotube enclosure. A sonotube enclosure could be very tall, but take up comparatively low amount of floor area. I am pretty happy with my SBB4 Tempest, but I think for the next model I may want to try one with a bit more musicality, probably the Adire Alignment. If I wanted to build a sonosub with the same performance as the box equilvilent do I simply use the same internal volume and amount of poly fill? Is there anything else to it at all? I figure that like this I could simply transport Tempest between boxes rather than moving these large enclosures long distances. Also, how much does a sonotube enclosure cost to build versus a box one?