Debate: Class D amps need 48 hours of warmup

@devinplombier 

You were called out for saying that your "engineering knowledge and actual listening experience have not lined up".

Sorry, my friend, I understood your meaning and I meant to reply in a humorous way about how I would troll civil engineers.   I should have added laugh emotes. 

@mitch2  Understood. Different professions carry different mindsets and different torches. Let them call things whatever they want. In this regard, it bears no consequence and is none of my business. I just hope they don’t spin out Venusian stuff like this — it’s annoying and nearly nonsensical.

On the other hand, the way you’ve rephrased your opinions is articulate, professional, and to the point — like an engineer handling things the way they should be.

@ghdprentice  Sanitation Engineers.

Indeed, this profession covers your / our 'ass.'

So apparently my post was too much for Audiogon, but I don't care.  You can't argue with facts: asphalt is a liquid.   

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)