Vincent, the amount of heat that would cause a problem is going to be dictated, in large measure, by the temp rating of the components used inside whatever it is you're worried about. In the case of the HR Balanced Desktop, I can't imagine it being an issue since HR tends to be pretty conservative with what they'll tolerate for operating temps. I don't remember that amp getting all that hot (relatively speaking), I mean it was never "I can't touch it hot" like the Wheatfield. If it really is worrisome for you get a IR thermometer and monitor the temps periodically. I think you'll find that what's warm/hot to the touch isn't all that hot really. For example, caps like the Panny FC's are rated to operate up to 105C, which is way hotter than any of your components are running (at least I hope so!).