Carvin Audio Explanation. Substitute Preamp for Mixer.
"THE RIGHT ORDER TO TURN THINGS ON
Before anything else, let’s review the power up sequence for a common live sound scenario. Power up in this order:
- Sound sources like keyboards and synths that are connected to the mixer
- Mixer
- Power amps
- Powered speakers and stage monitors
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PROPER POWER DOWN SEQUENCE
As you might imagine, spikes occur when you turn equipment off as well. Since all the gear is on before you start powering down, you’ll need to power off in the opposite direction (first in last out). So in the example above, active speakers and power amps would be turned off first (so they don’t receive a spike from the mixer), then the mixer…and finally the onstage gear connected to the mixer."
Some power controllers have sequenced power banks that do this for you.