I agree the sweet spot is larger than one might think. What is unusual in my situation is the fact that these darn support columns get in the way of having a traditional 5.1 configuration. If we were willing to put our love seats in front of the support columns, we could use a traditional L/R surround setup. However, we want to have the love seats in between the columns, and the center column would block the sound from one of the surrounds (e.g., a person sitting in the right love seat would not be able to hear the left surround because it is blocked by the center column) - hence the twin zone idea came to life.
