Thanks. So, you are saying that to set the amp for 2 ohm operation, you would need to hook it up to your computer and reset the configuration before going out on the gig (assuming it was set for 4/8)?
Nah, the ohm setting is in one of the menus right on the amp itself. The only thing I've used the USB port for is to upload new software or new cabinet profiles. That info goes on a little thumb drive, and you just plug that drive into the front of the amp.