I have the combination of the A90 7.1 and P90/3 used for both stereo and multichannel. The source for DVD-Audio as well as CD is DV89. All units are placed below the TV on the same (professional) rack and at the moment A90 is on top of P90 and DV89 alone. I wonder if that is the proper placement since both A90 and P90 are consuming more power and therefore more heating then DV89. Should I put DV89 on top of P90 and leave A90 alone, or this placement is OK? The rack itself is open from all sides and the space between the shelves is about 30cm so air circulation is not the problem even for the paired components.