I didn't know 20 amp power cords had special connectors, and I really don't know anything about them. Yesterday I plugged in a very stiff Pangea AC-9 I discovered I had bought at one time but never used. The box doesn't say what the amp rating of the cord is though. The sound seems to have lost a bit of detail compared to the Richard Gray loaner I've been using. I really dislike the stiffness, so maybe a 20 amp cable is not for me.
db