Paradigm...

do your own google search my friend! unless someone has been a long time Paradigm dealer or owned each individual speaker as it has been updated, it is unlikely that anyone would know he differences between versions without doing a google search themselves.

How do the versions relate to year of production?

What changes were made with the version changes?

Thanks

What line are you looking at? The current/latest versions of each line are as follows-
Monitor V.5
Studio/Reference V.4
Signature V.2

Sure. Each updated model is designated with a new Version number. That way you can tell the vintage.

Kal