When using Dirac with my Arcam AVR850, I choose the sofa pictures to set my mic positions when measuring. The thing is, I'm not sure whether to follow the mic positions as recommended, as my sofa is higher than the one shown. I am not sure if the first mic setting should be exactly at ear height or as shown in the Top, Front and Oblique pictures. According to the Top View, the mic positions should be at the back where I sit and also a third of the way in from the front. In the oblique view, all the mics are placed near the back of the sofa. I don't think the diagrams are clear and does anyone have any recommendations please?