Debate: Class D amps need 48 hours of warmup

At the office, I have a McIntosh mxa80 driving Sonus Faber Sonetto II’s.    At home, I have a MHT300 driving Martin Logan Renaissance 15a’s as well as a MA12000 driving Sonus Faber Sonetto III G1’s and a JL sub. I listen to music on all of these, but it’s streaming at the office and on the theater systems and CDs or vinyl in the listening room. 

Both the MXA80 and the MHT300 are Class D.  The MA12000 is a hybrid of Class A and Class D.  

All that to say I can’t hear a difference.  Ever. The MA12000 has its own warm up schedule for the tubes, but that takes just a few seconds... which is what I would expect of electronic components.  Frankly, I cannot imagine a piece of kit which would require hours or days of warmup.  But I’m a lawyer, not an electrical engineer. 

Serious and not intended to be inflammatory question:  do the electronics on NASA missions require hours or days of warmup for optimum performance?  Does anyone know? 

EDITED: I've just read the whole thread to discover that some engineers already posted and there's such a thing as Thermal Stability.  Hmm. I wonder how or if that impacts performance or if it's measurable.  Anyway, thanks for dropping that knowledge!

Acutally asphalt cement is a form of highly viscous petroleum material that ranges from a liquid to a semi-solid depending on the temperature.  That is why it is mixed with aggregate and placed (paved) at high’ish temperatures.  That is also why poorly designed and placed asphalt concrete is susceptible to rutting on hot days when repeatedly loaded by heavy traffic.  It is graded so that different grades of the material can be used depending on the expected ambient temperature of where it will be used. 

Pavement made from asphalt (or bituminous concrete) is considered flexible while pavement made from Portland cement concrete is considered rigid.  They both have their pros and cons and like most things success requires proper design, construction, and materials selection for the intended purpose. 

I vote that asphalt jokes be allowed on Audiogon, but most of them are dumb.  BTW, asphalt believes in second chances—you can always patch things up. (sorry)

Atma-Sphere class D monoblocks here as well. I leave them on 24/7 and do seem to have a slightly better more lifelike sound compared to when I used to turn them off. I do wonder if it affects lifespan of the components inside though? @atmasphere 

In my outdoor system I have a Bluesound powernode which is also class D. It doesn’t have an off or standby mode. I figured if that’s stayed on for the past 4 years and still works fine, then the Atma-Sphere class D’s should be fine as well?

No warm up required IMO.

I do wonder if it affects lifespan of the components inside though?

@veerossi Not at all.