Debate: Class D amps need 48 hours of warmup

They run cool anyway so the point is moot.

I thought it was worth asking in the context of "why do some insist Class D is still bad?"  - I have had mixed experience with amp warmup.  I have both ICEpower and Hypex plate amps.  The ICEpower to my ears sound the opposite of smooth for a couple of days.  Hypex sounds good, but _maybe_ better after being on 24 hours.  

If listeners formed their opinions on ICEpower cold, that may explain some of the remaining anecdotes. 

My Luxman integrated on the other hand is similar to what others have mentioned.  Sounds good almost immediately, no big improvement if left on all the time. 

My whole rack gets powered down when not in use. 

Start it up just about every morning around 6am. Usually it just sounds a little "off" for about an hour. Sound stage is smaller, imaging is a little off. It's subtle, but there. 

Another thing I have noticed, on Sunday mornings it always sounds best, even when first turning on. Think this may be due to everyone else still being in bed, no other electronics on in the house, and surrounding area. The noise floor is definitely lower.

I have a pair of Harmony GaNM monoblock Class D amplifiers and they sound the same within 1 minute or 2 days of powering on. One good reason to love them :)

Tim

I own Atma-Sphere Class Ds and they stay on 24/7 unless we're going on vacation. When I first got them I experimented with various warm up times and they always sounded better the longer they warmed up. Since I often don't have a lot of time to listen keeping them on gives me more enjoyable hours. They stay cool to the touch and draw little power so I see no downside of leaving them on.

@armstrod  and @atmasphere Thanks for the feedback.

The staying cool part I think is a big deal!! 

I've not done a direct measurement of Hypex to ICEpower but I think ICEpower are cooler when idling, in general.  I may be wrong.  I wonder if that in some way delays their warm up time?