Another technical explanation question ... I have been looking at equalizers, in-line drivers, and am confused by the difference between the volt rms drive. Hopefully my wording here makes sense.

I understand that the ws420 is the only way to go and so on and so forth but thats not really my question. My questions is not product related.

Head unit is say 2v rms and the ws420 is 12v rms. What is the end result at the speakers? How much of a difference? What about the range in between?

What is the difference between 2v and 12v at the end?
What is the difference between 2v and 8v and the end?
What is the difference between 8v and 12v and the end?