Debate: Class D amps need 48 hours of warmup

I’ve found that my NAD M33 Masters Integrated sounds tight, compressed, and thin for the first 30-45 minutes after it has had power turned “off” to it (at my ac filter/pdu).

My Krell K300i integrated only takes about 15min to warm up and sound better.

To be fair, I’m not sure it it is the amps or the rest of my chain that improves with a bit of warm up.   I’ve never experimented with removing power to just my amps.   It could also be partially due to my streamer and DAC warming up.

Every power amp I've owned has taken between an hour and two hours warmup to sound its best. Preamps longer.

@easystreamer Perfectly reasoned and stated!

MyLAIV Harmony GaNM sounds 100% after 5 minutes however I believe there are other components being used that also need some warm up time such as a tube preamp etc.

So I really should have asked how many people have actually tried this?  If you leave them on all the time, have you powered them off ?  If you don't, have you tried leaving them on for a couple of days?