My center speaker was jealous that it was run by a 7B-SST2, and that my front speakers were run by 2 - 28B-SST2's
So i upgraded my center speaker to a 28B to appease it.
I got my new 28B 2 days ago and left it on overnight.
I was not playing any music throught it. The rest of my system was turned off.
When I checked it yesterday I could not believe how hot it was. It actually hurt when I placed my hand on top.
The front plate of the unit was also very hot, when you placed your hand on the front it was uncomfortable.
My current 28B's never get anywhere near this hot, even under heavy use.
I also noticed when I turned on the unit, it took twice as long to charge before the led turned green, compared to my current ones.
Note that my current ones are only 6 months old(same technology).
I turned off the amp last night. This morning I unhooked my speaker cables and turned it back on.
The amp is in the same place as my 7b was. Not an enclosed area but an open shelf unit, open on all 4 sides.
The cables are the same that I used on the 7B. I will recheck when I get home today. If it is smoking hot again, I guess there is a problem.