The unit has a 10 layer PCB that spreads the heat totally even over the PCB. That means that all components have the same temperature, instead of some staying cool and others getting really hot. The temperatures reached are no problem for any silicon. They could only be a problem for the electrolytic capacitors, drying them out more quickly. Of course we were aware of that. The special low ESR types used throughout also have higher temperature specs, a lot higher than the typical temperature of the PCB.
Due to the 10 Layer PCB and multiple ground connections the internal heat is transferred easily to the housing, much more than on comparable units (where this heat would stay locally with a few components, really stressing those). So the ADI-2 Pro indeed gets more than just warm on the outside. Don't be worried, that is a good sign, not a bad one. As long as the vents on the sides are open a long-time operation is secure and safe.
Thank you MC, that is some very good and comforting information to know. At first I was shocked to find that after about 3 hours use I could not hold my fingers on the front panel of the ADI-2 Pro for more than about 5 seconds. I must admit this freaked me out!
My ADI-2 Pro is mounted in a custom wood cabinet next to my mastering console. I was concerned that words like hot, quite hot, more than warm, I felt, might be a little subjective so I decided to do a little science. I got my IR remote thermometer out and measured the front panel around the on/off power button which was the highest temperature on the front panel and it measured 58.1 C. (125 F.) Putting the Laser beam spot on the sides of the ADI-2 Pro's case from behind the open back of the enclosure yielded a temperature of 51 C. (123.8 F).
Again, my ADI-2 Pro is in a custom made wooden 1U rack cabinet and it mounts using the RME full width 19" rack mounting kit. There is about a 4mm air gap on the front of the rack from the top and bottom for ventilation and the rear is entirely open. The width of the cabinet allows the side vent to be completely open and free for air circulation. Nothing else is in the cabinet except for the DB breakout connector and cables.
1.) Should I be concerned that the ADI-2 Pro should not be mounted in this way?
2.) Should I be concerned leaving this unit on 24/7 as I do with all my studio gear?
3.) Would it be necessary to mount a small muffin fan in the wooden cabinet?
So now we have some numbers, at least on my unit and setup.
Please let me know if the numbers I measured are of any concern.
Thank you very much for your knowledge and help...