Updated 8/03/2011: We've dramatically improved the box structure of these speakers
We now use Birch Ply enclosures on all Mini Cubes and subwoofers! This is a significant upgrade to the old MDF enclosure model. Our price has gone up slightly as a result, but performance is well worth the extra investment. There is nothing else on the market built like these speakers at even 3 times the price. The sound is incredible.