This is also a flawed analogy as the whole line of balls will still move slow. It's more like tiny balls on a loudspeaker. When you apply energy to the loudspeaker a pattern depending on energy on frequency will develop. It's more the speed at which this pattern can change rather the speed of movement of the individual balls
I'm thinking more along the lines of the spot where the balls were is a hole which the balls now occupy. The balls moving isn't the point I was trying to make it was the force from one end to the other. Not the greatest analogy I'll admit.
I'm not sure I understand what you're saying it almost sounds like you're referring to impedance.
