I find this thread interesting. 9 pages of this. Someone is worried about whether their amp takes a couple watts in standby, not because of the clearly negligible cost but because of the "ungreenness" of it. Of all the things in the world to worry about, you pick this?
Have you considered the power required to keep this forum online and how much your post adds to that power use? And to put it in perspective, how much power is coin "mining" using in comparison, and how much is AI using? They are measured in gigawatts and terawatts, all so that old pervs and incels can whisper sweet nothings to their AI girlfriends, and the rest of us can get fed lies and disinformation that some billionaire wants us to believe.
My advice- life is short, you have to choose your battles. Choose things that matter, not things that don't.
If the standby power worries you, buy a solar panel and a battery and power it that way. Or stop listening to music altogether. Your (all) entertainment is a waste of power.