Are you using some kind of ac power conditioner or something with relays and delays? Your use of 12v trigger indicates this...
1.Amplifiers, on last and off first.
2.If you have an active crossover or something like a DSP between the preamp and power amps; on before preamp and power amp. Off, depends on answer to #2.
3.Preamp, on second (if you have #2), off second or at the same time as #2.
By "source", what do you mean? DAC, CD player, turntable, tuner, streamer or what?
Are we talking, SS, tube, class D? Please provide MORE DETAILS before following my advice above!
1.Amplifiers, on last and off first.
2.If you have an active crossover or something like a DSP between the preamp and power amps; on before preamp and power amp. Off, depends on answer to #2.
3.Preamp, on second (if you have #2), off second or at the same time as #2.
By "source", what do you mean? DAC, CD player, turntable, tuner, streamer or what?
Are we talking, SS, tube, class D? Please provide MORE DETAILS before following my advice above!