Good question. I assume pre has to provide for that. My pre (Dac) never fully turns off since it operates with remote. It provides proper sequence for the power amp.
Powering up/down sequence with a 12v dc trigger
We all know the proper way to power on your system is,
SOURCE->PREAMP->AMPLIFIER
The reverse order is for powering down.
What happens when a 12volt dc trigger is used between the pre and the amp? The pre’s trigger out is connected to the amp’s trigger in.
Powering on would still adhere to the proper sequence
Powering off would not. Or would it?