I dug and dug and could not find a single thing that had anything to do with Eleven. The only thing is the obvious reference to the move Spinal Tap (1984). The great scene where Marti DiBergi is interviewing Nigel Tufnel. Nigel is telling him about his amp that goes to eleven, one louder. The words, “…but this one goes to eleven” have been repeated many, many times. Most people know the reference and make the connection.
I am going to replace or repair the sound system in the Range Rover during this restoration. When I’m done, I’m hoping it will “go to eleven“. I have it on good authority that Santa’s radio goes to eleven.