I recently contacted K+H about my D's and they gave me some helpful tips I had not seen elsewhere before, so I thought I'd share with you guys. Here are snippets from his email: Answering the question "How close is too close to a wall or corner?" To answer your question directly I would consider less than 6" to be "close". However, the amount of boost seen from walls depends on the solidity of the wall and the distance from it. A loudspeaker placed next to a brick wall will experience significantly more bass boost than a loudspeaker placed 2' away from a single layer of gypsum wall. Thus one can see that any guideline in an operating manual can only be a simplification of the reality in the room. Please use the recommended settings as a starting point but be prepared to make changes to get a better result. The best results can be obtained by acoustically measuring the loudspeakers in the room and then making appropriate adjustments in positioning, room treatment and equalisation. Also note that as one moves the monitor away from a wall, a notch starts to appear in the bass response: for example, 1 m (3') leads to a cancellation at 86 Hz. This goes down in frequency as the cabinet is moved further a way from the wall, and vice versa. The solution is to put the monitor next to the wall and then compensate for the acoustical loading using the bass control. All the above is true for ALL loudspeakers, not just K+H, as bass is omnidirectional.