I have found this on speaker burn in and also this from the same company. It is the only measured review of drivers and break-in I have come across. How much of these differences in measured performance makes a difference to the sound of the speaker is subjective to each listener, IMO.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70