Which Class D Amplifier? PS Audio, Ghent, Nord, Merrill or other???

As far as warm up is concerned,  other than Bourbon has taken over and everything in the room is just better.  

+1 and more!!
 
Amps are adjusted and calibrated at the factory for peak performance after a short 1/2-1hr warm when they've reached operating temperature, even tubes, to say they sound better after hours and hours is a furphy.

Yes electrolytic capacitors like to be formed/polarized with a little time from new, this again is only a short time, and not every time it's turned on.

Cheers George

As far as warm up is concerned, I cannot hear any differences in a cold start up vs. the amp having been on for 4 hours... other than Bourbon has taken over and everything in the room is just better.  

Me neither. I can only hear it after at least 24 hours.  I suspect this is very amp specific however. But mine are stock ICEpower modules. YMMV.

georgehifi stated:
     " Amps are adjusted and calibrated at the factory for peak performance after a short 1/2-1 hr warm when they've reached operating temperature, even tubes, to say they sound better after hours and hours is a furphy."

furphy?

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Batteries not included,
Tim

why would anyone turn off their amps after listening, especially class D amps

Tweak1,
Because some of us have tube preamp sections in our integrated amps.