perhaps something like this but for every speaker model
example ...
M80ti (with pic)
first introduced in 19... to .....
----------------------------------------------------
M80 v2 (with pic)
manufactured from ..... to ......
main changes; drivers position & improved crossovers + front grill
---------------------------------------------------------------
M80 v3 (with pic)
manufactured from ..... to ......
main changes; improved crossovers + front grill
please if you support this idea please go to the poll >> !!! thanks