Here is what Pass says about the heat in the manual of the X250-

Our environment is about 23 degrees Centigrade, room temperature, and the heat sinks will rise to about 25 degrees C. above that, for a heat sink temperature of 48 degrees C. In your setup the temperature may vary a bit due to line voltage and ventilation, but it is not a big deal. You should be able to put your hands on the heat sinks without discomfort for 10 seconds or so.

48 Celsius is 120F. I would say that mine gets a little hotter than this after about 1.5-2 hours of play time. Even the front panel gets very warm. The heat does not bother me but it may in the summer. But I don't use the system much in the summer as I am out doors a lot due to the short summers here in MN.