I was wondering when you have your serato box plugged in using usb and a power adapter.. which is the main source of power for the box? is the usb the main source.. and the power adapter a backup in case of failure.. or if the power adapter is being used.. the box will not pull power from the usb

thx

When am external power adapter is connected to the SL 1, the adapter is powering the interface. The USB port is then just sending USB packets and etc without powering the SL 1.