Alan and Masa, I'll stay in the corner. In the corner, with the subwoofer cone within about 1 1/2' of the floor and each wall the maximum number of room resonances are excited. Assuming that the three room dimensions differ significantly(no cubes)the bass response there is both the loudest and the smoothest. Since it's louder there, the bass has to be rebalanced, but the solution is to turn down the level, not to move the sub.

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Enjoy the music, not the equipment.