Debate: Class D amps need 48 hours of warmup

@atmasphere  - Of course.  I should have been clear. 

It's my impression that ICEpower amps, at idle, draw less power than Hypex amps, at idle, with similar rated amplifier power. 

I don’t notice much, if any difference when my class d amps are cold versus when they have been playing for a while versus when they have been on standby. Maybe if I listen hyper critically, but doesn’t seem worth the trouble. Now my class a single ended first watt amp definitely needs to warm up. No comparison between that and the class the amps

My experience has been, yes it makes a difference.  Id say at least 24+ hours with my Primare A60 class D amp.  I feel like it needs longer to sound good than my Pass Labs which is absolutely unexpected and I don't really understand why.  But it's not subtle.  Soundstage is more closed in and things sound less alive and real during warm-up if that makes sense. 

On my pass A30.2 it sounds really good right off the bat and only gets slightly better on warmup.  If bias were an issue, I'd think I'd hear more of a warm-up with the Class A? As that seems to be more commonly mentioned in audiophile circles.  Just a note there.  Just one person's anecdotal experience here.  I recommend using your own ears and system to determine this.  My amp is a purifi model I believe?  An older one but the implementation sounded way better than better measuring amps on my system to my ears

Over the years, I've found that all my power amps sound less harsh or lifeless after 30 minutes of warming up. More so my old B&K class A/B amps, but less so with my current Peachtree GAN-400 class D power amp which seems to sound open after only 10-15 minutes. Not sure if this has anything to do with the GAN topology... Since I like to listen when the mood strikes me, I like to keep the entire system including the power amps powered on 24/7 save for extended vacations and lightning storms.

My hybrid (class D and tubes) PS Audio M1200 monoblocks sound their best after ten minutes of playing music. Really interesting to hear how the sound improves during those first ten minutes of getting warmed up.