I just bought an NAD C720BEE receiver. I have it in a stereo cabinet. It has about 2 inches of space between the receiver vents and the top of the cabinet. There is not a lot of space on the sides, but there are no vents on the receiver's sides either. I am going to open up the back of the cabinet. I also make sure that the front door is open when the receiver is on. The unit is barely getting warm, but I just want to make sure that I'm doing the right thing here. Should I put the unit on top of the cabinet? Thanks.