I called Mesa due to looking for a 2ohm stable head and have read on TalkBass here that the Walkabout will do 2ohms. Well it can. But don't, unless it's for short periods and not in hot weather. I got a call from Mesa tech support because I wanted to know before I bought one. I left a message the other day and he just called back. His exact words. It can do 2ohms, but if left running for too long or running in a hot environment it will overheat and fail. Key word "will". Just letting you guys know since that misinformation has been floating around here for a while.