Bernard, it would appear that the answer to your question would be no, except if the unit in question was actually called upon to operate at full power in all channels simultaneously for a period longer than it was capable of doing so(not necessarily the five minutes that's required if an all channels driven rating under the FTC reg was given by the manufacturer). Since this situation can be duplicated in the testing lab, but isn't a realistic scenario in home use, it doesn't appear to be something which should be a matter of great concern.
