Certainly running demanding speakers can cause amps to run hotter and that may shorten the life of the amp. Just another reason to run two amps bridged mono or vertical biamp. You double the available power and you also double the heat sinking. If you play at the same volume you would with a single amp you should ameliorate the heat problem significantly. My moderate current, fairly inexpensive amps will put out 200/400/800 into 8/4/2 ohms when run bridged mono. They’ll put a whole lot more than 200 into 8 ohms but I’m not looking to play loudly enough for the inability to double from 500 to 1000 watts to become a problem. They’ve been operating flawlessly for around 7 years now.
