The power requirement seems pretty standard. So is your specific question about what type of power connectors to use, or are you wondering if maybe you need a large-diameter wire in your power cable?
Do you have a power cable input jack connector on the sound mixer, or are you saying there isn't a connector, and you have to figure-out how to supply power to it?
I'm thinking, that you're just worried about whether you might need some heavy-duty cable to operate the mixer. At 21 Watts, that's not a big problem.
Is there an issue with connecting a power input cable to the mixer that we're unclear about?
One last question that I'm wondering about:
Can you give us the manufacturer and model number of the mixer so somebody here can Google information about it.
Your Avatar Flag is for the U.S. We should find out if your mixer was made in or for the United Kingdom, or some other power grid. (Or the U.S.)
Typically, when something is labeled 115V/220V 50/60Hz, there is a switch on the unit to select one or the other.
We should find out what you've got, before we offer advice about how to supply power to it.
