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

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?

      Please take our official multiple choice quiz on this weird word's meaning:

A. furphy: An Australian English slang word meaning an erroneous or improbable story that is claimed to be true.

B. furphy: An Australian English slang word describing the sound a down-under cat makes when attempting to cough up a fur ball.

C. furphy: An Australian slang word, only permitted to be utilized in emails but forbidden to be ever spoken aloud and exclusively used by members of a certain Australian political fan club, that members claim translates to American English as 'covfefe'.

D. furphy: How an Australian pronounces the word 'thirsty' after downing 2 gallons of Foster's beer.

     Correct entries may or may not be eligible to win an official Aussie Georgehifi Furry Fluffy Furphy Action Figure that performs Frequent Forward Flips, unofficially but commonly also known down-under as an OAGFFFAFFF  just for fun.

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.

I can tell you why my amps are Always turned off after each use:
Lightning strikes!  I turn them off by unplugging from the wall.  At $7K its not worth risking damage.  

I lost my entire sound system/ TV/ Digital readout on my Bridgeport mill, and more due to a strike which came in via the main power supply from the street.   This is the second time I have been hit.  The first came in from the grounding system and took out my well pump.