I'm pretty sure it's highly recommended to use a tripod or something of the sort to hold the microphone, rather than sitting in on a chesterfield or holding it in your hand, because objects nearby (especially a wall) will cause reflections that will result in an improper calibration.
Did using a tripod actually make your walls disappear?
Smartass, Charles
. To correct the record of what I've said- just keep the f'in microphone away from a wall
!
Ken, you've got a quick trigger finger for apropos pictures that always amuse me.