It will work just fine to turn it on all at once
The problem is that if you power your amp on and hear a "pop", it means your speakers just got a very strong transient signal. This is the exact sort of thing that can damage speakers. If you don't hear the POP, then it's fine. I have powered Studio monitors hooked up to my 11 Rack and if I don't turn the speakers on last, I get the POP when the 11 rack comes on. That's the indication that I should turn the speakers on last.
There is an old saying among audio guys about Amplifiers in general.
"LAST ON, FIRST OFF"
This means the amp is the last thing turned on, (so everything that might cause a pop/transient has already happened) and first to be turned off (so that more pops don't hit them while turning gear off).
So in general, it's a good practice to follow the "Last on/First Off" rule for any type of amplifier of any kind, if at all possible
Todd
QUOTE (Phil66 @ Jul 19 2016, 06:53 AM)
I switch everything on from one switch. My valve amp is left in standby and my audio interface is turned all the way down. Been doing this for eons with no problems. Not to say others won't have issues though.
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