Re: Ev zlx
From an engineering standpoint, I don't think it is good that they get that hot. The PRX powered speakers also tend to the hot side as well.
My feeling is that the thermal cycling of the circuits is bad and can cause failures. Additionally, if it is that hot on the outside, think of how hot it is on the inside! That doesn't do good things for the voice coil or the material the speaker cone is made with either IMHO.
My DSR112's rarely get more than "warm" to the touch and even when ran full out, I can still stand to put my hand on it.
My PRX618S-XLF's on the other hand will get quite hot if I push them all night. I have had them for about 2 years and play them every week. So far my fear of their higher temps hasn't resulted in any issues, so I could be wrong 
