I just bought a powermax for my board. I do have a question. If I am correct even though it puts out 660 ma on a channel, but it should only draw the amps needed for those plugged into the channel correct? Example. Shure glxd 16 draws 250-400 ma. So it should draw only what it needs from the outlet. Yes? Or is it a constant 660. If it is I’ll have to make a return. Should have checked first