Fred - agreed, the direction makes a difference due to the way the sound reflects when facing different directions in your room (think of a rock in the pond that the ripples bounce off -> move the rock, the reflections come back from a different direction). [Can everyone keep up with my ueber-scientific explantions?)
With that said, I've never heard anything close to a night & day difference from changing the direction of the sub either, but when graphing the response of the sub facing forward versus sideways, there are differences.
It's worth trying a different direction if you're trying to find the most linear response in a given position, but it is unlikely to cause a huge difference.
Jason
