"The towers are rated down to 42Hz, the center to 60Hz, and the surrounds to 40Hz (which has to be a typo on their spec sheet as there is no way the bookshelfs play lower than the towers)."
If you look a little closer, it's more than just a typo. Your specs are a faithful copy of their web site, but the site is in need of some editing.
The center is listed as "2 Way 2 Driver Surround", while the surround is listed as "2 Way - 3 Driver Center". Is the surround really wider than is is deep? Does it really weigh more than the center?
The fronts are crossed over at 3.5Khz for the mid/tweet. Are the center & surrounds really crossed over at 6Khz?