Can you leave class D amps on and not ever turn them off?

Regarding sound quality when leaving on versus turning off,   I suspect leaving it on at it should be only helps but have not been dissapointed either to-date after firing it up cold.

Can you leave class D amps on and not ever turn them off?

Yes.

I don’t trust SMP power supplies, they are finicky to component (caps etc) aging

Most Class D’s use smp (switch mode) power supplies, they do go up in smoke a bit more frequently than linear ones, and can be a fire hazzard if not at home.

Cheers George

I always leave it on unless I am out of town for a week. At least with my amp there is a night and day difference. One hour did not do it. I have had the same experience with other SS amps.

+ 1

Mine is a dinky and has been left on 24/7 for the most part, only shut down if out of town for long periods.  No noticeable 'start-up' issues, but it's as simple as a pet rock...*G*