How hot is too hot?

I am the original OP and I would like to thank you all for your comments and suggestions.  They are all very helpful.  I just want to say that I live in Taiwan.  We have very pleasant winters but the hot summers can roast you at 38 degrees Celsius.  The government has regulated no public indoor temperature can be set at lower than 26 degrees and that should answer some of your queries why I keep such a relatively high temp at home.

One thing however I notice is that the Diablo's temperature depends more on the loads than the ambient temp.  It used to be around 46 degrees with my old B&W 702S2 speakers and now at 50 with my Magico A3.  It stays around the same levels even when indoor temp is around 18 in the winters.

Isn't that a bit strange?

I don’t think it’s strange. Amplifiers don’t just supply power to any speaker you connect to it. Each type of speakers demands a particular load of current. Obviously this has much to do with the music or musical passage. If you think of an action movie in home theatre, some passages with dialogue are very easy on an amplifier but when helicopters fly and explosions are going off everywhere…the speaker is requiring more juice from the amp to replicate these sounds. It would be interesting to know what ohm rating the Magicos are and how that may fluctuate with demand. Also the sensitivity rating. I would imagine this would be different than you previous speakers.

Cook eggs on your amp?

You guys might be on to something here, and kickstarted an entire cultural phenomenon?

I had a friend who wrapped food in foil and cooked it while he was driving his car.  It didn't know it was a "thing" until I researched it.

Manifold Destiny

Class A Gourmet?  Just a thought.

Wow 78 degrees F. Both my partner and I wilt over 70.

And 26C is pretty warm for any room

Well, the Earth got pretty hot for any human. We need to adapt and fix it...