It's your choice. It's truly AC/DC and works over a wide range of voltages in either case. When you said 'can be wired for 115v or 230v...' it brought back memories of the days when one had to move a jumper or throw a switch but this doesn't even require that. Just hook it up to whatever is convenient and it plays. Just make sure the ground terminal is connected to the chassis or the ground wire of the source and that L goes to hot and N to neutral if you are picking up from a 120V supply.