Debate: Class D amps need 48 hours of warmup

@oldnslo  : 

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? 

Sometimes! The optics and electronics on the James Webb Space Telescope took weeks before they could even begin to calibrate them. 

As with most of this audio stuff, the hierarchy goes:

• Does it have an effect?
• Can you measure it?
• Can you hear it?
• Does it affect your enjoyment?

Many here believe, "everything matters," and it probably does, but not everything that has a physical effect can be discernably measured or heard and, even things that can be measured and heard may not meaningfully affect a listener's overall enjoyment of their system.  System warm-up probably falls somewhere within that hierarchy but, even though I am sure my new tubed DAC sounds best with at least 30 minutes of warm up doesn't mean I don't enjoy the sound of it as soon as I turn it on.  There should probably be another step in the hierarchy asking, "do you obsess over it?"

Well, I’m definitely not obsessing over this. It was really just a curiosity.  I think it’s also kind of obvious I’m not selling anything.  I’m not asking you go buy a new amp or get rid of your old one, or buy a new isolating widget of some sort. 

I just wanted to know what listener’s personal experiences were.  

@mitch2 hear hear

I leave my Classe CA-D200 class D amp on 24/7 unless I'm leaving town or during thunderstorms but I generally turn it back on when I return/when the storm is over and I've never noticed a difference. While it's never gotten "hot" regardless of volume, it's warm enough to attract my cat, who would not be happy if I didn't leave it on.