Jez Corbett wrote: Btw, what's the '12v Trigger' option about?
Common facility on high-end hi-fi to turn devices on-off. It's a 12V DC control voltage.
Typically, a preamp would provide a 12V Trigger output when it's powered up, which would be used to turn on a separate power amp. Or the preamp might have a switched 12V trigger output that could be used to activate the curtains when TV input is selected, etc...
And a power amp would typically have a 'soft' powering mode where it's left permanently powered on, but it shuts itself down unless it receives a 12V trigger signal.