No problem with the room size. Are you intending to place the speakers in a kinda cupboard, shelf or such? Looking at the boundary distances you've mentioned, issues may arise, however, both the 306 and 305 featuring a "BOUNDARY EQ SWITCH – This switch is used to compensate for low frequency anomalies that may occur when speakers are placed on a work surface or in close proximity to walls. Settings include 0dB, -1.5dB, and -3dB. Select the setting that provides the most natural bass response for the application." Give it a try but definitely you benefit from placing the speakers on stands, a console etc.