Axomoxa, your are referring to the older Concentra. The original poster is referring to the new Concentra II, it uses the same switch-mode power supply and has the same (heat sink-less) chassis design as the Model 10 and Model 12 power amps. Yes, the new designs do run quite a bit hotter than the older models, but no worse than many other amps I've had around. Give your Concentra II a few inches of breathing room in your rack and you'll be fine.
Krell knocked off Jeff Rowland
I had an opportunity to see the new Krell productlines. Am I seeing things or Krell designers are having designer block and they're trying knock off Jeff Rowland's design? On to bigger and better things. I also had chance to listen the Jeff Rowland's new integrated amp. The units seems to run very hot. Is it because of the new cleaner designs which has no heat sink fins? What do you felow audiogoners know about this heatsinkless design?