What Would Be the Reasoning Behind Leaving Class D Amps On?

Some aren't left in standby that's why. I have Nord Buffers on NC500 modules it's one or the other. I set mine to stay on and NOT go into standby. I run them for 4 months out of the year, and combo of class ds and valves the rest of the time.

It takes 20-30 minutes of playing music even when I leave them on. If they go into standby, 2 hours to warm up and sound ok. Big difference in mine anyways. 

I also use class Ds for bass management 12K for subs and columns. 30 minutes to work well and warm up the VC in the bass system. 20 drivers for that alone. Cold gear sounds wonky, so does overheated voice coils. :-)

Regards

@testpilot , HA!  That made me smile. 

@oldhvymec, You too!  I knew you had a valve thing going but not Class D too!  We might be cut from the same cloth.  I have this weird sense that what you are saying is what I'm experiencing.  I know it's observational and prone to subjective interpretation but it feels like the amp is dry and lifeless if you just turn it on from a dead stop. 

I should clarify.  My amps are always on.  I implied they go into stand-by mode but that is not true for the amps.  It is true for my DAC and Preamp if / when I power down using the front switch.  The DAC never gets powered down and the Preamp when I'm not listening.

OP:  I've had exactly the same experience.  I have IcePower amps and they sound really scratchy for about 48 hours then just open up. I only noticed this because I went away for a week and decided to unplug the stereo.  When I came back I kept looking for an explanation and then magically the sound just really transformed on day three.  Other A'goners have had very similar experiences.  This may very well explain why some listen to Class D and decide it's not ready for prime time.

On the other hand, my Luxman 507ux is good in 5 minutes.

I have ZERO idea why. :-)

@erik_squires ,  THANK YOU! E.   I know you have some technical knowledge and background.  How wonderful it is to hear someone like you say, Yep, this is my experience and I'm not sure exactly why.  

Certainly the notion of caps being charged up and everything staying warmed up makes sense. But many of us have found the Class D "warm up period" is not ideal unless it's really given some time--not just 30 mins. 

I want that Luxman, Erik.  I'm lusting after their Class A stuff now.