I've heard of the 1/3 rule, where the speakers are 1/3 into the room from the front wall, and the listener is 1/3 from the back wall, but this is not always practical. Right now my MS-906's sound great at 18" from the wall (measured from the rear of the speaker), but I'm wondering if this is enough. Due to furniture considerations it isn't possible to move them out much more. My rear bookshelf 902s are only six inches away from the back wall - less than I want, but they sound OK when my receiver's bass management is set to "Small." Again, it is not possible to move them out much more. Any thoughts, especially for the front?