Realizing auditory augmented reality with moving listeners requires assumptions about the acoustic field in order to maintain an adequate auralization while keeping the effort for room acoustic estimations low. For a position-dynamic binaural synthesis a sub-sampling of the walkable area is necessary and binaural room impulse responses or parameters thereof must be updated according to the listener’s movement. This contribution discusses the requirements for such systems with focus on just noticeable changes of room acoustic parameters and their effect on room impression and perceived distance of sound sources. Our research aims to find methods and measures to characterize a room and to derive a perceptual adequate sub-sampling of the walkable area.